Chevy 990 bbc heads. 650 range and they work well.

Chevy 990 bbc heads The first production runs of 291 heads have washered plugs. Oct 12, 2014 · This is a pristine pair of Big Block Chevy 188 square port cylinder heads, the 188's are identical to the 990's just a later casting. 19/1. The date code is irrelevant unless you’re really trying to re-create a piece that matches some original documents and sales dates. GM casting number 3872702. Get the best deals for Bbc 188 Heads at eBay. The 990's had a basic bowl port ( 88%) of the valve diameter. 700 lift. Much better heads for driving around on the street in a heavy car. 19 Intake, 1. 080" and still be safe on most BBC iron heads,(not including intake valve seats over 2. I am wondering how many cc are they? Also how are these heads on a mild (10 to 1) say 235 @ . 750" and maximum lift is . Heads, Comp. ratio with the 375 and 425 pistons. Apr 5, 2012 · I'm putting together a 496 for my brother with some 990's-2. 30, srp forged pistons, forged h beam rods, steal crank, have a victor jr. Chevy only installed these heads on their high-output performance engines. Feb 5, 2004 · If this is going to be mainly a "street car" you would be much better off selling the 990's and looking for a set of 049 or 781 oval port heads. Our 781 big block Chevy heads are a perfect fit for your 7. 800 exhaust Heads are low hour rebuilt machined, decked, valve job done with hardened valve seats. Hope the flow #s help. 060-inch overbore with a 4. Only 400 miles on them I’m going a different route. Pro Comp heads are useless junk an make zero power, Patriot heads are a little better. I have a friend with a 9. 60 first time out with these heads. These heads are best for vehicles that see frequent drag strip action. Exhaust port exits are raised . fuck a small block. 400 intake valves and 1. FREE delivery Fri, Jan 24 . Low and mid-range power would be superior compared to the large rect. where will i get the biggest bang for my buck porting. com. Aluminum aftermarket cylinder heads offer tremendous airflow potential to maximize power potential. Find many great new & used options and get the best deals for 454 Big Block Chevy Rectangle Port Cylinder Heads 6272990 at the best online prices at eBay! Free shipping for many products! Nov 10, 2005 · You can cut your heads up to about . 88" exhaust valves, 7/16" rocker arm studs, . These have the hardened seats. It's easy to get caught up in the numbers game with those published flow numbers. Sep 12, 2008 · I am going to buy these rectangular port heads 3856208 for my old 396 build to match my 3855992 4 bolt block. 10-18-10 07:58 PM - Post# 1991558 Never had my heads flown but was curious what a set of 990 heads are capable of on the intake and exh sides during a prostock type porting effort. The thing is, I don't know that I need 298cc heads on 433 cubic inches. (dont know specs) and all the other go fast stuff (carb, exhaust, intake, etc) I found a set of 990 heads locally any they seem to be in my budget (guy wants 850 for em) With With the part number ALL-20203, you can easily find and order these 049 heads for sale. Heads cc are around 114 flat top piston zero decked. May 21, 2011 · i have a good set of 990 rec. With the 781 BBC heads, you'll experience enhanced power and torque thanks to their excellent design and construction. 7:1 rocker arms, full set Great package! $900 + shipping from zip 95991 Northern California, 40min. No porting. 19 valve i want to go to a 24 degree 2. I've ground/sharpened a socket wrench but the hex head literally screws all the way in, leaving nothing to bite. 19) but, why? As stated above. Find many great new & used options and get the best deals for BBC Cylinder Heads Rectangle Square Port 990 Big Chevy 454 MK IV Ls6 6272990 at the best online prices at eBay! Free shipping for many products! Oct 16, 2008 · I am a huge fan of the old 990 heads. #2 I found a set of Brodix -2X(340cc) heads NIB made around 1998. On a 620HP BB that already had well ported 990 rectangular ports on it, they just bolted these on and gained 100HP! Motor went to 720 HP. 00 for both pair 703 966 2639 bbc 990 cylinder heads - Car Engines & Engine Parts - Strasburg, Virginia | Facebook Marketplace Facebook Jan 13, 2011 · If the heads are from about 1973 or later, they should have been induction hardened at the factory. 625 roller cam springs) Titanium retainers Milled . 25/ 1. 0 hp 468. Walline Member Posts: 183 Joined: Thu Apr 29, 2004 9: LS Compatible Heads Menu Toggle. Jan 11, 2013 · The 990 head is a 118cc open chamber rectangle head. Get the best deals for Big Block Chevy Heads 990 at eBay. Compression would be upped to 13. New sprigs for hydraulic flat tappet cam. 88, no porting. Sep 16, 2006 · The AFR heads had about 2 less cc's than the 990's so maybe a little of the et came from a slight increase in compression. A set of the Merlin oval ports and . Please remember the casting variations of production heads. they are rated at 98 cc chambers and was put on the 396 and 427 bbc . The 026 head is a LS6 rectangle head. Aug 24, 2005 · BBC 990 head info. 590 lift. I have read in several places I see it is a 101 cc head or 109 cc head combustion chamber size. by using the aluminum heads. 19 intake valves are installed. 060 over 10. Call (855) 806-1147 or Order Online! Jul 26, 2008 · Regarding BBC Rect port heads the Street BBC had them, the crate 454HO's still have them. Install larger vlaves (2. Jul 26, 2011 · BBC BB Big Block Chevy 990 Heads ALL NEW Heres a pair of completely redone, all brand new BBC RECT PORT heads cast #6272990 (aka 990 heads). 00 a pair or $1000. port heads that i am putting 2. 050, 10:1 cr. 250" (around $400 just in valves) with NEW valve guides installed. 88) with some bowl work. my engine is a 496 12. Aug 14, 2017 · '990 cylinder heads, complete & still assembled Fel-Pro #8180PT2 head gaskets ($50) Mr. If restoration is your goal, your choice is limited to locating the correct casting for your original engine. you don't have to do much unshrouding . Says they are rare 425 HP head. 6M posts 68K members Since 2005 A forum community dedicated to 1955, 1956, and 1957 Chevy owners and enthusiasts. They have pockets for 26 degree 2. Aug 25, 2020 · I am helping someone out with a 454 and it has the stock 290 heads on it (3964290). Rectangular intake ports are larger in volume and designed to enhance high-RPM horsepower. Attachments 3964291 Combustion Chambers F469. 700. Maybe some experts could give you a better grind. Jan 18, 2018 · Other than very high-end race heads, most big-block Chevy heads have chambers around 119 to 120cc, so the choice is more one of piston design for street/strip engines. 9 hp 210/127 60. They come standard with stainless steel 2. I have run them to shift points of 7,500 rpm and slightly below with cams in the . Jul 11, 2005 · 1967 SS 396, M20. At the time, I recall using closed chamber heads from the original motor (66 caprice). I am putting a flat shipping price on here but it may very depending on where you live. Feb 8, 2010 · The 840 casting heads were phased from casting production in May of 1969. Chevy 990 bbc heads add your springs for your cam. Also remember we lost about 65 lbs. Jul 24, 2008 · 990 BBC heads If anyone is interested, please PM for details and photos, don't think there needs to be any further debate by guys who had no interest in purchase in the first place. 646 . Feb 19, 2004 · This head offers the highest average intake port flow and the highest peak flow numbers. 0's without nitrous. I am going the L88 solid lifter cam grind to get the 396/425+hp. We spent about $3500 for that 1/10 of a second. Comp Cams chromoly retainers, 10 degree locks, HP Comp Cams $ 950 BBC Chevy 454 big block rectangle port heads complete HP 990 - auto parts - by owner - vehicle automotive sale - Feb 28, 2009 · seen a 427 bored . ) but his 3100lb camaro with 13:1 496ci motor N/A went 9. 88 valves. Mine is a 468 with the Pro Comp 320 heads, Manley valves and Isky springs, 10. I don't mind spinning the motor to 7500 if it's required. Or fastest delivery Tue, Jan 21 . 250 duration @ . 88 square 2 HEADS assembled. Save bbc 990 heads to get e-mail alerts and updates on your eBay Feed. Today, the latest version of the Olds DRCE is the spec cylinder head for all GM-powered vehicles in NHRA Pro Stock competition, while the Pontiac Pro Stock head has been widely copied by aftermarket manufacturers, resulting in the Dart Big Chief head (paying tribute to the Pontiac Indian tribe), the Brodix Big Duke head, and Edelbrock’s Big Oct 31, 2008 · You have a very similar setup to what I have. 0 compression. Maybe talk to a real cam guru CSTRAUB, or UDHarold or an engine guy like Wolfplace or Mark VortecPro Mike 1231 for cam ideas on a lower compression street car with the big runners. Nov 28, 2010 · I have flowed plenty of factory big block chevy heads, so here it goes. 0 out of 5 stars Oct 12, 2011 · Unless you try back to back tests driving with a new design vs the 990s you'll be happy. Mortect site for BBC heads is blank. This data came from Chevy High Performance magazine tech article. Patriot’s BBC heads come as cast with a 320cc intake runner, US made bronze guides, and a 5 angle valve job. used in chevelles and corvettes. 063 heads may in fact be able to handle . The BB-3 Xtra heads are available in Dec 27, 2002 · This is stock with 2. If they are earlier heads they most likely would not have been hardened from the factory. They sold crate LS-6s that they lowered the compression on because of the bad gas with 188 open chamber heads. Find the perfect balance of Oct 2, 2008 · Merlin Cast Iron 269cc BBC Cylinder Head, Merlin III Cast Iron 320cc BBC Cylinder Head World has a couple of BB heads that are perfect for the budget builder. The JK 390 takes individual stand rockers that are available from both Jesel and T&D and are existing shelf items. port heads. The ZL-1/L-88 are both open chamber, where the LS-6 is a closed. 19 intake, 1. ” Finally, if you are looking for a closed-chamber head, you will need to use an OE cast-iron unit. Chevy Factory BB Heads had a bad exhaust design to start. Apr 12, 2005 · The 70 LS-6 used the 291 closed chamber head the 71 used an open chamber head. They'll out-perform larger heads in many applications. heads with 640 HP! Heads flowed 345 intake and 240 exhaust, both @ . only very necessary at exh valve/quench pad area corner if you are going Improved Performance Over Chevy's Legendary LS6 Heads! Merlin 269cc Oval Port heads are excellent for most street-driven big-blocks up to 468ci. Jul 2, 2020 · combo ported 990 heads 2. Sniper Big Block Chevy 24°, As Cast Conventional Port Heads, 290cc, Valve Jobbed, Each Sold out Sniper Big Block Chevy 24°, As Cast Conventional Port Heads, 290cc, Valve Jobbed, Each Feb 23, 2007 · They were never used on the LS-6. This is especially true when 2. My opinion is they aren't worth all the hassle. I think in most street applications, the 049's are going to stand up to the rectangular heads pretty well. Anyhow my heads had 2. Ran 10. These heads have 123cc chambers and have had some mild professional port work, I do Bow Tie Street Cylinder Heads have rectangular or oval intake ports. It also is 118cc open chamber head. Oct 8, 2008 · The Shocker 370cc full CNC ported is the Big Dog in our BBC line. The 291 casting heads did not begin production unitl June of 1969. The Merlin has a raised exhaust port that will help flow substancially. 600 lift but maybe not if the heads & block are decked,if using high comp/high domed pistons,and a long duartion large overlap high perf cam so keep that in mind too. 9's to 9. 88 Valves. Nov 30, 2001 · Re: Opinions On Big Block "990" Heads (bence13_33) My 2 cents is the the factory exhaust flow fizzles out at around . the set i have now i just Mar 11, 2010 · Well getting ready to pull the trigger on a new set of heads for the Better Half's BBC 427 Chevelle. Find many great new & used options and get the best deals for Chevy Bbc 990 Cylinder Heads at the best online prices at eBay! Free shipping for many products! Jan 14, 2009 · The 990 head is listed as Chevy's stock replacement iron rectangular-port head in the GM Performance Parts catalog but it is no longer available. Heck, GM put similar square ports on 396's so they should work fine on a well prepped 496. Your heads may flow a little better or a little worse but it should be close. I put the data in my desk top dyno 2000 and get following output: RPM HP Torq 2000 175 460 2500 232 488 3000 290 507 3500 354 531 4000 417 548 4500 473 552 5000 511 537 Aluminum Cylinder Head for BBC Big Block Chevy 330cc/122cc 396 427 454 502 540. At minimum you will have to slot your intake and not run end rail seals. Jun 25, 2009 · The "781" ovals with work seem to be the good oval/cast head and 990 seem to be the pick of the rec/cast heads. The heads were used on Corvettes, Chevelles, and other special applications. Moderator: Team. The extensive line of big-block competition heads runs from conventional siamesed port BMF (Beat More Fords?) heads that accept traditional Chevy pattern intake manifolds and stud-mount rocker arms, to symmetrical port heads for 5. 5 Open-chamber designs are larger and provide lower compression ratios, so require a much larger piston dome to achieve the same compression as a closed-chamber head. . May 2, 2017 · I had a pair of 049 Heads Reworked years back. 25-inch stroker crank. BBC PRO1 20 Feb 3, 2015 · Wondering what a set of 990 iron heads are worth? Professionally ported, flowed (don't have flow numbers) but done right Manley oversize stainless valves (don't remember size exactly but 2. Buy BBC Big Block Chevy Aluminum Cylinder Heads Bare Casting 345cc Rectangle Port From Karl Kustoms, One Of The Largest Online Retailers Of Chevy Performance Parts In The USA. they seem to be a very well performer the set before these i have now got me into the mid 11 sec range with just a back yard port job and some SS valves 2. Below is a test of a very mild application with the factory rectangular heads compared to a set of 2. 300x1. As remember that you can get the results like Ed Bigley's for about $6,500. 23 @ 196+ @ 3800# It seems everything is in order. 19 1. 4 posts • Page 1 of 1. iam still running mine with 385 seat and 960 open over the nose spring pressures using a 820 790 302@ . I was hoping for some 6. 35 valve. 600" max lift valve springs, and steel retainers. The intake ports are just about 2 ¾” tall and 1 ¾” wide. The oval port head has 110-cc chambers, and the rectangular port head comes with 118-cc chambers. 00% 421. 88 valves 118 cc chamber and 318 cc intake port. (Note - These are from a chevy ls6 crate motor - PN 6260482) They have somewhat less than 50k miles on them, and have no known issues. 350 valve, this head will support big cubic inches and Big power that will not break the bank and will shock your competition and ours. This is just a single cylinderhead. 5:1 468 with cleaned up 2. 00 in the engine. RHS/Pro Topline are affiliated with neither, and their heads actually make power. 3 hp - - - - N/A N/A 1. $1,500. Need a short reach plug, only thing I can find is a 13/16 head. 88 exhaust Pontiac/chevy aluminium small port /race: 10051128: Feb 20, 2019 · The Gen V and VI heads used a non-adjustable rocker arm with 3/8-inch studs. I ran them last night and the Sep 1, 2009 · Patriot’s Freedom Series heads meet the demands of the BBC world, while keeping the quality high and the price reasonable. Jan 15, 2008 · the #781's have the most unshrouded chambers of all the OEM BBC heads ever offeredthis makes installing 2. Jan 22, 2011 · I'm building a 496 BBC and have 2 sets of heads, 781 ovals and 990 rects. 88 Exhaust Valves installed. The exhaust was very impressive creating an E/I ratio of 72%. Shim the distributer hole up. 4:1 540, AFR 315 heads, Harold SR Cam with a Tremec TKO Now with FAST EFI Find many great new & used options and get the best deals for NOS Big Block Chevy Ls-7 454 427 Heads Open Chamber Rectangular Port 990 BBC L88 at the best online prices at eBay! Free shipping for many products! What Are The Top ProMaxx Performance Big Block Chevy Aluminum Cylinder Heads? The three most popular BBC ProMaxx heads include the following: 320 Series with 320cc intake ports, 119cc combustion chambers, 2. Maybe go with the 2. They feature a valve angle that is rolled 2 degrees from the standard location, and newly designed intake and exhaust ports. 92% 177/119 67. 19 / 1. 7 hp 225/123 54. When larger engines (454 to 540ci) require added flow, choose the Merlin Rectangle Port cylinder heads. The Motor specs: 427 BBC . edl. 250 in. I cannot find any flow numbers, CC's etc. 050 range. This may Dec 22, 2022 · The 298 heads flow quite a bit better since they're a full CNC head. I've never run either of these. The motor is a 454 +30 12:8. According to Bill @ Oddys, and Rob Adler of A-Team Auto (Tinley Park, IL), my current combination of Dart 360 head with 14-71 B-Rotor at 35% over will make approximately 2000-2100 crank HP. valves and as big ex. Mar 14, 2012 · the question is we are looking to get this 69 Impala in the low 10z, and we were looking to do a set of GM 990 heads but I am leaning towards a 781 head build. Used in: 1966 L36 390 HP 427 Corvette and full size Chevy 1965 and 1966 L35 325 HP 396 Chevelle and full size Chevy 1966 L34 360 HP 396 Chevelle Aug 29, 2006 · Here's one that will puzzle you, Its puzzled me and friends that know thier casting numbers for BBC Heads. 010 Looking to sell and wondering what they might be worth? BBC 990 Rec port heads. Gary Adrian Organized people are just too lazy to look for their stuff Choosing big-block cylinder heads depends entirely on the application. 25 and 1. It was a crate gm engine, we put a roller cam and a dominator on it with a single stage fogger system and in a 3300lb Camaro and it would run 8. The Bowtie heads were an over the counter head offered from Chevrolet for racers. 300cc victor 340cc _profiler _rhs _world products _porting services: big block chevy cylinder heads: we have the bbc head to get the job done: Apr 22, 2014 · Having trouble finding spark plugs for the 990 head. Mar 5, 2008 · The 781 and the 049 are virtually identical, both great heads. 2. 188 heads are not worth a lot of money there are just too many better heads made today. Late 69 engines, from July to October, have been found with mixed casting heads one #840 and one #291. This information comes from Mortec. 5:1 speed pro pistons, Crower 252/262 @. 25"/1. Nov 22, 2007 · Engine Tech - Best aluminum BBC street head for 496 - Finaly got my 496 BBC back from the engine builder (November 19th) It was supposed to be done sometime in July. Its runner will feed your beast, street or strip. 67% 462. Jan 30, 2018 · 01-29-18 09:38 AM - Post# 2722563 Starting to "freshen up" a 396 build from almost 30 years ago. 1 CR forged SRP Pistons. Big-block Chevy factory heads are offered in aluminum and cast iron, with either open or closed combustion chambers, and with oval or rectangular intake ports. Mar 10, 2021 · As I was told the 188 is a replacement for a 990 head that was the head on a lot of over the counter LS7's. 77% 466. 030 over (433cid) approx 400-410 hp current heads 049 castings ( new s/s valves etc) comp ratio 10. Not bad considering what the super stockers spend. 88 valve, ill post the flow numbers down below. The CID Big Block Chevy cylinder heads are designed to run with shaft mounted rockers that are available from both T&D as well as Jesel, depending on the cylinder head. Just started taking the springs and stuff of my 990's today, they are a pretty good head out of the box but with a little cleaning up in bowl area and adding a 2. Apr 29, 2005 · I have posted probably several years back SOMEWHERE what John L. 88 and a little bowl work Lots of the guys at Team Chevelle run 10s with these heads. intake to run, but still open minded about it, putting a 780 holley on it, hooker 2 inch headers Mar 10, 2013 · Note the "026" cast into the underside of the intake runner which is the 3994026 over the counter head released in 1971 (similar in design to the 990's also mentioned). 4L V8 engine from 1973 to 1984. 88 valves and 11/32 guides. 19 & 1. If someone has installed hardened seats in the heads, you should be able to actually see the seat insert showing around the exhaust valve. 23% 205/123 60. They are the 118 cc heads. With the chambers at 99. Now I have a set of 3964291 Heads, They are Rectangular port Closed Chambered Heads and have a 109 CC, 2. 573-434-6980 text me Dec 17, 2007 · Those heads are about the best street BB heads chevy ever came up with. o SOLD 6/2020 my 68 Vette 427/M-20/3. Yes these were fairly rare from the factory. These were a revised version of the older factory offerings. Review (MPN: 6272990 for sale) CHEVY Bbc Big Block Heads Rectangular Square 990 Port for CHEVY 454 427 The springs are not stock they are hp springs I do not know the spring pressure on the springs. at the best online prices at eBay! Free shipping for many products! Jan 23, 2011 · #1 Brodix Race Rite -2plus(312cc) heads bare and use all the parts from the 990 heads. Works reasonably well as a primarily street car with Comp 280H hydraulic flat tappet cam. 88 valve 049 heads, It depends on the RPM range/cam specs. General engine tech -- Drag Racing to Circle Track. I hope this helps but 650 out of 990 heads can be done. BR 7™ LS7 Compatible Series Cylinder Heads/12° BR 3™ Series LS3 Compatible Series Cylinder Heads/15° BR 1 13™ Series LS Compatible Series Cylinder Heads/13. Part Number: TFS-41310001-M13 5. Mar 15, 2013 · Then you would be far better off with 049 or 781 heads if stock type oval ports are required or 088-990 style heads if rectangle port heads can be used. I would never own either, unless I was building a small street piece that didn't need killer heads. Find 1990 CHEVROLET 7. 000-, 5. They should work OK, and the less wt thing is important. Jul 1, 2013 · C3 Tech/Performance - Will '990' heads wake up my low compression 454? - Ive got a low compression 454 (1972). 1981 Chevy monte carlo 396 BBC . 99 $ 399. Oct 2, 2008 · This head configuration would be much more at home on a larger displacement, higher horsepower application, but how can you argue with aluminum BBC heads that flowed over 400 cfm for around $600? Equipped with the Procomp heads, the BBC stroker pumped out 690 hp and 600 lb-ft of torque. Reher-Morrison′s DRM-20° Cylinder Head Conversion Kits come complete with all of the Dec 31, 2004 · My Chevy Iron 990 heads flowed 350/230 @ . Gasket #5819 intake gaskets ($30) GM OEM "+" head bolts, full set GM OEM 1. 700" lift. first cam was a solid roller cb xr280 r-10 . 650 range and they work well. New Ferrea Competition Plus valves, F2101P - int 1. my quest is how much should i port other than port match to intake. 48% 432. Since valvetrain weight is an issue, we elected to use the Comp 933 dual Apr 21, 2006 · General Q & A - Porting 990 heads, how much is it worth? - I found the cylinder-head-flow-bench on www. , 502!! Re: bbc 781 heads 01-30-04 10:17 AM - Post# 382381 In response to Doug_F Hi Doug , if you look closely at picture of chamber i posted link to and your heads you'll see compared to heads like #990 rect-port 's chambers, the #781 is GM's MOST cast unshrouded head they ever offered . 050 to 9500 rpms. Use of either style head requires that the correct pistons are used, otherwise BBC Cylinder Head Casting Numbers RECTANGULAR PORT - Valve size 2. off the front of the car. Dec 14, 2009 · 990's are probably the best open chamber, I've had 'em next to the newer rectangular port heads and the short turns are a lot longer/rounder on the 990's than the new 188's. 88 with 3 angle valve job and a 20 degree back cut on the valves. 050 (594hp. 3 hp - - - - - - Chevy Bow Tie Phase II CCM 184/55 - 64 63/57 90. 290 & 049 heads have oval ports. Does anyone have or have seen any flow numbers for the heads? Curious what kind of power they will support. 10:1,hydraulic roller 236/242 590/612 on a 110. 99. BBC Cylinder Heads Chevy 454 320cc 115 cc 2. 9 cc closed chambers before milling. 90" valves, a 210 hy-roller and a Performer, then the Accel flat topped torque box on an about 9. Jun 29, 2010 · Those heads were on the L78 396's in Nova's, Camaro's, Chevelles, etc. 36 28 year owner Sep 29, 2007 · John, I also run a mild BBC in the Beaumont with closed chamber heads and very low dome (0. Dyno test. The heads are Sq port 990 casting. I had the choice of using a set of stock 781's or the 990's and my engine builder leaned towards the 990's. got using a set of worked over -236's with 2. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Jul 24, 2011 · Edit this is a set of BBc heads . 30 intake valves in the 298 heads, 2. 30" intake / 1. The factory champion number for these heads is the V57C. 5 + compression and the 290/063 heads (like i run) are basically the same lrg oval port head with 100. Oct 13, 2019 · BBC 290's Heads. 242 Chevy Bow Tie #2 N/A - N/A - - - - 250/174 69. 362. Jun 13, 2009 · thousands of posts on BBC builds, 049 and 781 heads . My question is can i get the pistons machined for the different valve angle and larger valves or will have to order new pistons. I stand behind everything I sell or work on, can't hardly get stock 990's that need rebuilding for this price. Oct 15, 2014 · The 3919840 cyl head is a 107cc, closed chamber, rectangular port head. chevyhiperformance. 3:1 and race weight would drop to 3200 lbs. They have never been hurt, no repairs, ever, and are ready to run. Open 074 heads are 118cc, where the LS-6 closed, is 106cc. 5X10. Find many great new & used options and get the best deals for BBC Heads Square Port PN 6272990 Open Chambered. That motor, with a messed up tune made 1300 HP. GMs #990 rect "LS6 Mar 1, 2008 · That's why all aftermarket big-block Chevy heads come with 111/432-inch valve stems instead of the stock 31/48-inch stem. Chevy Tri Five Forum. 880" (mechanical). 90? I think) New Comp Cams Springs (1. Really does not fit. 050 . 88 ex valves. Feb 20, 2008 · As for the 088 heads compared to a set of 2. These BBC 781 heads offer outstanding performance and reliability, making them ideal for enthusiasts and restorers alike. In Oct 25, 2008 · Patriot and Pro Comp are NOT the same. There are still plenty of these heads out there in recycling yards and from after market manufactures. 2-1 KB pistons, cranking comp with throttle blades open 185lbs Dec 25, 2007 · in comparison, our rivals BBC, there is a fellow (on another site) that makes 850+ horsepower with factory cast iron 990 oval ports heads and has a video of it in the process. Chamber sizes and design of the head. 240 to low . Hope this helps. 5 comp 714 714 rollar comp cam super victor intake dominator in a 2700 lb astra panel wagon 457 gear 14 x32 tire. i dont care if you can build a stroker 434 and put aluminum heads and everything else,it would still only have the same hp as this big block maybe more maybe less if you I'd hate for someone to take the advice to get some "oval port heads" and end up with a set of the "peanut port" heads and not even know it due to the fact that they never knew there was any other type of oval port head other than a small oval port, then notice shitty performance around 4500-5000 RPMs and not be able to figure out what's Jul 26, 2022 · DZ Performance 496 bbc. The "Hi-perf" is always square port and "early 70s" is most likely open chamber. 0's all day long. 4 days ago · The Chevrolet Performance service replacement cylinder heads are direct replacements on most 1990-and-later GM Big-Block 454-cubic-inch and 502-cubic-inch engines. Both in the right hands will make good power. 44% 454. Now I have all winter to replace the current heads, My long range plans are to sell the car and buy a 32,33 Ford street rod or maybe a nice early 50s Oct 18, 2009 · C3 Parts for Sale/Wanted - LS6/ LS7 BBC heads - Pair - Iron LS6 heads (Complete Assembled, Used) . While all early cast-iron and all-aluminum heads used 3/4-inch-reach gasketed spark plugs, most iron heads made after 1969 utilize smaller, taper-seat spark plugs. 48% 130/100 76. 5° Small Block Chevrolet Compatible Heads Menu Toggle. It was used on the '67-'69 396-375's and 427-425's and gives approx. )496 bbc, 990 GM. 650 lift and below 7,000 rpm, after the minor mods are done. Dec 15, 2009 · These heads look very close to the originals and are redesigned from the "074's"! The heads you mention above have "300" intake runners and 110 exhaust's, unless they've been opened up!! We recently deliverd a 509", 10:1, solid-roller with the "990" C. 700" in & 239/. It doesn't appear either head has been ported or cut. These brand-new cylinder heads meet GM's stringent quality standards and provide excellent service and durability not found in used cylinder heads! Technical Notes: Cast-Iron or Aluminum Musi Victor 24º CNC-Ported Cylinder Heads The only out-of-the-box head capable of 950+ HP from conventional big block port locations! Designed by 5-time Pro Street Champion Pat Musi, this version of the Victor 24° Cylinder Head has fully CNC'd chambers & ports. i can fit. 250 long rods used on a 468 with good compression and an open plenum intake manifold makes for a sweet street Mar 29, 2013 · Here is my cam, that I used back in the day with 990 heads, Crower roller X7270 int op @ 19 cl @51 exh op @ 64 cl @ 16 250* int dur 260 exh dur int lobe . 60% 514. 200-, and 5. IK® Series Cylinder Heads/23° Race-Rite® Small Block Series/23° Dragon Slayer Series Aug 21, 2015 · I have two BBC motors, a 454, 049 heads, Performer RPM, headers, and not sure of the build, pretty mild, in my new to me '72 El Camino the other on the stand, a 427T/496, 188 heads, being refreshed. Upgrade your big block Chevy with these BBC 049 heads for sale and experience a significant boost in performance. com for my 990 GM heads. to run in my 65 Malibu. Have a new set of valves for either, Ferreas and Manleys 2. rpm Nov 5, 2008 · BBC cast iron 509"/#990-heads (Flow 344/. 100 dome) forged pistons. Bored 30 over with a 'mild cam'. 25 int 1. 300 very HP + TQ beneficial. George Kettler o SOLD 8/2016 my beloved 1970 Elky 496. Port shape, chamber design, and valve size […] Find many great new & used options and get the best deals for Chevy Bbc 990 Cylinder Heads at the best online prices at eBay! Free shipping for many products! Oct 8, 2007 · How common were these heads? How many were made? Should I sell them to someone that needs them for a restoration before I damage them racing. 5 cc I have 10. They like bigger valves 2. I. and the ZL1, L88 and L89 427 in Corvettes. I had a 454 with bone stock 990's . 2 pair of Chevy 990 cylinder heads $650. May 7, 2007 · A friend of mine said that they took a lot of work to make them right (valve guide clearences, etc. 620 lift on a 108CL, Holley strip Dominator intake, Holley 850DP, TH400 with a 4500 nitrous converter, 4:10 gears and 29. 25 intake valve the 990's become a great head. I narrowed down some indexing rings to bring it out a little. 5 comp dish blower je piston . Call (855) 806-1147 or Order Online! May 18, 2015 · But for a low-cost street head, the price of bare heads plus all good parts (including new valve guides, because theirs are garbage) is only a few hundred dollars below the price of good heads that you can just bolt on, and not have to fight with your intake manifold not fitting, replace the valve guides after 2,000 miles, and other such Apr 23, 2019 · C3 Tech/Performance - Good Inexpensive BBC Aluminum Heads - My engine builder is extremely pleased with the results they get from one of the off-shore BB aluminum cylinder heads. Both heads are date coded L 10 5, Or December 10 1965. The real 450HP LS-6 had 291 closed chamber heads. 392 exh lobe . Cylinder heads with oval intake ports are smaller in volume and designed for greater low-RPM torque. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Oct 4, 2005 · A stock set of 781/049's with the stock valve size is will flow around 265 cfm @. 11:1 comp. Aluminum heads possess two additional threaded bosses under the intake runners. 88 valve 781's that made 560 hp and 560 tq with an hyd roller cam in the high . Usually you will have to have the intake milled. it is to my understanding that our D0VE-C cylinder heads in comparison to their 990 cylinders heads flow more in max effort. May 5, 2005 · Engine Mods - Big Chevy Closing the plugs need help - I am having a real problem finding a set of spark plugs for my race motor that will work. I had the bowls under the valve opened up as far as they could go. $399. 25:1 voodoo 60203, About 20 cfm more than stock #049 heads. 8 or so out of mine so it looks like I will be in the ball park. Dart Machinery’s comprehensive selection of Big Block Chevy cylinder heads is meticulously engineered to elevate your engine’s performance. It was killer in my heavy ass Chevelle. I run 310cc Dart Pro1 heads which I love. The first one is the assembled Merlin oval port cast iron head, with a 269cc intake volume, a 119cc combustion chamber, 2. 88 exhaust Buy Bowtie Rectangular-Port BBC Aluminum Bare Cylinder Head From Karl Kustoms, One Of The Largest Online Retailers Of Chevy Performance Parts In The USA. And a tight fit at that. The 990s have a 320 cc volume and the newer heads are way smaller 265,290, 305, 308, 315 etc. It's about cross section,velocity profiles and a bunch more that the big head guys can explain that makes the heads perform way better. Chevy Bow Tie 178/- - N/A - - - - - 221/138 62. Jan 6, 2007 · Dont forget that max lift also has a very important componant to that mix which is piston to valve clearance. Lee’s Summit MO. 050 duration 540 lift cam 454 BBC. I chose the 049 heads because of the exhaust runner, had the bigger runner than the 781. I like them much better than the bigger 990 heads and they can out perform them too below . 25 / 1. 88" Valves This is new PAIR of our newly released Assault Racing rectangle port big block Chevy aluminum cylinder heads. Dec 20, 2007 · You made reffernece to your 290 heads with flat tops in a BBC as having approx 9. 607/. com, Chervolet By the Numbers and a few other books I have. 030, aluminum rods,stock crank,comp nitrous roller cam,bone stock 990 heads je nitrous pistons, made 687hp on nuts and 1132 on nitrous. I plan on goin aluminum heads at some point but if these will hold me over with out hurting me that would be good to. NORTH of Sacramento Thank You! (53 oh) 23 seven-seven oh 65 Cylinder Head, PowerOval® 280, Aluminum, Assembled, 113cc Chamber, 280cc Intake, Chevy, Big Block, Each. 25 in the 270's. jpg Chevrolet Big Block Cylinder Head Casting Numbers. 750") 1956 Chevy Bel-Air 7. I think it is their site down or somethnig. Don't miss out on this opportunity to enhance your engine's capabilities with our high-quality, 454-cylinder heads. Feb 9, 2009 · doing the same, i was basically given the motor, dad buying the parts and im picking them, lol, cant beat a free motor till you get the one built you want, anyway, 454 bored . 5 Jul 18, 2012 · A common stroker displacement, our 496 was the result of combining a 0. Jun 13, 2004 · i have ran other 390 heads along with my current set now. PAIR of BARE Big Block Chevy BBC 454 Rectangle Port Aluminum Cylinder Heads 330cc Intake Port * 124cc Chamber * 2. 290s are closed chamber, 049s open chamber. Chevy High Performance used these to build their 675 hp 496. This head would be best fitted on a big-inch street big block using a large cam that could take advantage of this head’s high lift flow potential. Our BBC rotating assembly came from the experts at Scat Enterprises. . 400 lift when the 049 head will flow better at higher lifts because of less valve shrouding. Description: AFR’s new 457cc 18° Big Block Chevy head are our best performing highest flowing head in our BB Chevy lineup. 653 on lsa 110 242 248. 300-inch-bore-space mountain motors. 88", F2112P - ext 2. Hobbies DRM-20° BBC Cylinder Heads Only Available from Reher-Morrison Racing Engines THE MOST POWERFUL CONVENTIONAL CYLINDER HEAD YOU CAN BUY, PERIOD! Convert your Big Block Chevy from a standard conventional cylinder head to a more POWERFUL DRM-20° cylinder head. 700" out with numbers still climbing at . They both flow in similar numbers until . now a 10. 2 to 1 or so CR. Cam XR300HR 248/254 @. #990 and #188 are the most common over the counter heads from GM during the 70s. Those are open chambers of the sort to be expected for #781. on these heads. RECTANGULAR PORT - Valve size 2. 88 valve 049's. In the aftermarket, most performance heads are aluminum rectangular port, open-chamber designs reminiscent of t Jul 27, 2022 · The GMPP head (PN 12363400) with 300-cc rectangular intake ports (left) performs very similarly to the oval port head (PN 12363392) with 290-cc intake ports (right), if both have the same compression ratios. Jan 3, 2002 · Open-chamber designs are larger and provide lower compression ratios, so require a much larger piston dome to achieve the same compression as a closed-chamber head. Make it a condition of the sale that it pass magnafluxing. 300 to get more material to shape in the bowl area and valve job areanot necessarily to hog out the Port, but instead to shape the Bowls and short turn curve better. Find Brodix Cylinder Heads BB-3 Xtra Cylinder Heads for Big Block Chevy and get Free Shipping on Orders Over $109 at Summit Racing! Brodix Cylinder Heads BB-3 Xtra heads take conventional big block Chevrolet technology a step further. May 7, 2023 · But if you had plenty of P to V clearance in a running engine before which used these same pistons, and the same cam had been used, and the chamber volumes and the valve diameters are the same with the replacement heads as the ones you had were, and the heads in question haven't had material shaved off of the decks either, then the fact that Nov 6, 2007 · Scarce Matching Date Code Cylinder Heads for Big Block Chevy Engines. pocket port under the valve or any big chief head kits _edelbrock mmce 24 victor cnc mmce 18-20 victor cnc mmce big victor e-street performer & rpm victor jr. You see I got this motor from a buddy its complete from pan to carb It just seems ashame to pull off the heads ( 990) pull out the solid roller cam because people say you schould not run a solid roller on the street and put the gmpp alum 502 heads and a BIG voodoo solid flat tappet more and more money , dont get me wrong my nova is one of the The Chevy Big Block’s Performance Heads have very large Intake runners with rectangular-shaped ports. Comp. 88 exhaust Nov 26, 2015 · Got these heads on my 555 I purchased and can't really find any info on em other than they are 116cc ls6 replacement heads. ( Think dental gas ) Looked them up in Cars&Parts magazine catalog of chevy V-8 engine casting numbers 1955-1993 and stamped numbers. Both are presently stock, no porting but have been cleaned and maged. 25/1. 19 or 2. These heads are fresh from the machine shop and need nothing. Sep 4, 2011 · 990,s thank you for the well thought out reply. 4L/454 Chevy big block Mark IV Cylinder Heads Assembled Cylinder Head Style, Rectangular Intake Port Shape and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Mobile App Purchase - Get the App Final Day! Dec 7, 2008 · bbc heads 26 to 24 degree heads Post by fuelcustoms » Sun Dec 07, 2008 4:22 am I have a 8. Big Block Chevy 990 heads. You use the 2. /590tq. It is a service replacement head, also used on Mark IV crate engines. Nobody makes an aftermarket closed-chamber head. You can flow more "out of the box" with any of these castings. 250 or 2. 6 hp 493. Flowing over 450 cfm with a 2. Rpm air gap 850 mighty demon. It would happy rev till 6500+ pulling all the way. 7 hp 209/127 60. 19 valves and a roller cam since we have all the valve train parts already. With springs from a 700 lift solid roller. hqrj jmmcwvq mempcc gsohfhu mygv ztfxdpyk kkpzqxz padwpi umcye goaea