993 sbc heads These heads are very similar to the 441 and 493 400 small block head. Jan 6, 2008 · I have to choose some heads before MONDAY My choices are some 993, 441, and 882 casting SBC heads(all the same price and valve size). Feb 13, 2011 · These 993 heads are a 76 chamber head, and no way they cannot be taken down to 64cc head. Are they worth it to replace my rebuilt 624 heads. I gather 441, 487, and 993 are the ideal castings. My heads were only pocket ported and had no tuning done when i took it to the track. Head Type Valve Size Pro Top Line Pro Lightning 180. 993, good valves, 28 springs, angle milled . If you dont have them headers and a larger cam will wake it up. We have been working with the Chevy “Open Chamber” heads for years. But just a moment, you’re a beginner and you don’t have a flow bench. My heads have had some work done them I will be building a 383 next month with flat top pistons. Nov 2, 2006 · The best use of todays fuels is found with the Vortec style head. I'm afraid the heads might need alot of work. Mar 22, 2020 · What we have is a $100 400ci small block in our challenge car. Clean up the ports as best you can to help the flow. Applying what is detailed in the next dozen pages on heads will allow you to generate more airflow and, consequently, more power. just about the worst smogger head combination, suitable only for bone stockers or use as boat anchors or door stops. Would the 993's as they are, maybe a little clean up and new springs, be able to handle like a XE262 Cam? Re: 441 and 993 1. i gave him my 993 chevy heads for it. These heads also have 1. 055 in 193 swirl port vortec heads which most guys will tell you are complete junk but worked great in a hot rodded pickup. Hobbies › Car Engines & Parts. Heads. Does anyone have or know of, or even built thier own, Chart with info on several SBC head castings. Mar 30, 2003 · 993/997 heads cam is 230/230 . the customer wanted them flowtested before any work so nows a good time to flowtest them . but are better heads for the cost of vortecs. 2 bbl rochester on a 2701 Edelbrock intake, 1/2" spacer per rules. Beginning in 75, Chevy started cutting corners on the SB heads, and by 77 they were basically junk. 94 valves. YOUR BUILDING A BUDGET SMALL BLOCK CHEVY WHAT HEADS SHOULD YOU BE LOOKING FOR AND WHAT TO STAY AWAY FROMsee part 2 http://youtu. 02/l. The heads I was thinking about are 441's. Cylinder Heads, Enforcer, Aluminum, Assembled, 64cc Chamber, 195cc Intake, Straight Plug, Chevrolet, Small Block, Each. 72: 1. 84/1. Castings I'm interested in particular: 882's, 441X's, 441, 186, 993, 487X, 291, and small chamber 305 heads to exclude the Vortec. Sep 28, 2007 · There not the best heads for sure, but depending upon your budget, you can actually get some surprising results. 4 for the 882/993 heads, and Dec 17, 2013 · the 993 also came, i believe around 71-73, in some cars like Monte Carlo etc. I flowed and give results on sbc 882,441,487,and 487x heads. hump heads. I've heard the 882's perform well if you can keep them from cracking. 60 valves available; latter machined for screw-in studs & guideplates: L: Right-facing bench 993: Common big-chamber head, not a lightweight casting; sim to 487; may have steam holes: M: One triangle: 882: Alternative marking for 882; see I, above: N: 2 triangles: 624 Apr 7, 2017 · The 991 are small 1. $480. Best I can find is a fairly consistent >200cfm rating. Dec 10, 2020 · building a small block 355. Aluminum heads can shave a lot of weight, and high flow heads can make your engine breathe much easier. they are a heavy casting head and are one of the best for street performance on a 350. Re: FlowBench numbers on various SBC heads 07-03-02 07:14 PM - Post# 113471 In response to 68corvette 2qwik2c , i have the latest version Edelbrock Performer heads here , i'll flowtest heads like they are right now , and post details in a 1/2 hour or so . Mar 14, 2007 · The 882 head is a 75-later head-----NOT GOOD. Part Number: AFR-1001 4. Alum. 94 1. Find many great new & used options and get the best deals for SBC Chevy GM Cylinder Heads 3988993 Fresh 1. 72" intake valves and large 76 cc open chambers. Description: 71-77 Chevy 5. The 009 and 013 runs were conducted from about 3000rpm to about 5200rpm, so the torque gains are higher than the HP gains. If your rules require the use of “open chamber” heads, the ‘441, ‘487 & ‘993 heads work the best. I'd guess about 8. 50: 034: 64cc: 2. Many classes of dirt track racing are restricted to these large chamber heads and the racers are looking for this casting number specifically. 055/1. 02 ,1. We would like to show you a description here but the site won’t allow us. 5 76CC 911 930 Turbo Engine Case Cylinder Head Stud In Dilavar (ENG 993 101 170 54)X24. 1 CFM 1. Nate . Iron Heads. Oct 16, 2014 · And I'm not sure that a 993 head is much better than an 882. The heads are casting 882. 84 valves. Save Apr 12, 2021 · The heads I am currently running are the 993 smog heads and flat top pistons with a RV cam. I noticed that the rocker arms are self aligning and also have the narrow pushrod holes. 3998993 is the full casting number. in their defense though, the American version of those heads are often cracked too. Get the best deals for Sbc 993 Heads at eBay. 5cc and i have taken the chamber out to 63cc and plenty of meat left. I believe they have been milled, but I don't know how much. 00/1. If you have exhaust manifolds better heads wont make that much of a difference. these were the heads that were used on all of the target master replacement engines. I had mine shaved . ) 2. I have the torque values with the 993 heads, but the spark plug lead (needed for torque values) was not working properly with the E-Street heads. More tech info. Some time ago Chevy High Performance magazine did a Mr Goodwrench 350 build up from stone stock to screaming wild in itty bitty steps see the included URLs. I witnessed this motor with the 0128 heads and cam combination in action and was curious what it had for cam and heads / pistons. Thanks for any help. Even the Ebay sbc heads are better, ho Jun 27, 2023 · 993 Chevy Heads And Chevy 882 Head Specs Comparison. 7L 350ci V8 1. 94/1. Sep 15, 2021 · Re: SBC head ? Post by 88bluestar » Tue Sep 21, 2021 4:14 am Just measuring the cross section on them, the 993(1. They are not a performance head. and yes, the vortec heads from south of the border tend to be thin. How does this casting head respond to maybe larger valves and some bowl work? I have a set of these from a 400 SB and trying to decide if they will be worth messing with for a "grunt" 400 in my Suburban. . Jun 7, 2004 · The 993 heads were used in 72-73 Chevy 350s, many of them were the 250 horsepower version. But head replacement can get you into intake to head bolt up issues and rocker arm issues. The 993 ports are better then the 882 port and they clean up nice. With its advanced and efficient production process, backed by more than eight decades of experience, VEGE is able to supply remanufactured cylinder heads with a level of quality Checking out a pair of 1973 993 casting SBC cylinder heads from a dirt track "claimer" engine. All the research I did on the X head said it was the same with a bigger intake port and 2. Opens in a new Jun 2, 2011 · The 993 casting is a better casting then the 882. Jul 11, 2005 · The 291's are the old double humps with 1. , so they are also a production head. 02" x 1. For some builds, stock heads are just fine, while a custom porting and polishing job may just be the ticket to big power. Jan 10, 2002 · I've been told that even worse than the 882s are the 624 heads which came on my '81, and which I am still using. Sounded pretty healthy for a SBC. We have a great online selection at the lowest prices with Fast & Free shipping on many items!. Aug 29, 2011 · I doubt there enough difference in flow between any of the open chamber SBC heads- including the 993's- to get excited about. 76cc 1. If you have some check to see if they use the tapered seat or sealingring on the plug. casting # chamber vol. The 86 thorugh 95 heads use a different bolt angle alongside the plenum. 02. I have had 2 different 327s in mine one with 882s and one with hump heads same cam intake and exhaust cant say their Feb 16, 2010 · Milling your heads ten thou will decrease the chamber of a 76 cc SBC head by less than 2 cc. Oct 4, 2008 · Got a question for all the SBC engine guys. Sep 4, 2021 · So rules dictate no porting, and have to use open chamber SBC heads per rules. In his book on S/B Chevys, David V. May 11, 2003 · the 993 casting came off originally 307 - 350 engines, 74cc chamber small valve smogger head, used 72 - 73 and was also used on the GM target master engines made in mexico. 02 or 1. $7,500. 60 Pro Top Line Pro Lightning 200. Listed 9 hours ago in Cascade, WI. 50 valves) is just a bit bigger on the intake port entry then the 991(1. but it has double hump 202 heads. So who knows ,might have dome pistons in it? More coming later on this challenge. Whether it's a lightweight head or not, any used head should be checked for cracks, especially in the exhaust seats. 31 12 bolt 487 heads are essentially the same as 69-70 441 and 72-up 993 heads. Camaro, Corvette even Stovebolts can be found here. 94 in 1. All I can find is the flow numbers for the 882 smogger heads. I believe the 487's and 993's are virtualy the same head. (before I got the heads). Jul 3, 2007 · The heads will need 2. May 9, 2008 · 487x heads flow the best out of all the big chamber medium valve heads (1. 100 long valves, 5 angle valvejob, cut for screw i May 11, 2023 · The 993 heads are low compression SMOG heads intended for low NOx emissions but their chambers a poor users of fuel and not considered of worthy for high performance use however if you’re on a tight budget there are ways to improve the situation without new heads. great stock cylinder head, other than the little problem with them cracking. the ones on the target masters were made in mexico and have HENCHO EN MEXICO cast into them. They are both 76cc smog heads, but the 993 casting is a little thicker casting and less prone to cracking. May 11, 2014 · The 993's rebuilt will cost nearly as much as a set of decent modern replacement heads. Orange Crane Gold Roller Rocker Arms SBC Chevy Find CHEVROLET Chevy small block Gen I VEGE Remanufactured Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! VEGE Remanufactured cylinder heads are a popular choice for performance and value. Jan 1, 2023 · Our lineup of small-block Chevy production heads is (from left to right): 128 ('87 Corvette), 882, 487, 126, 441, 993, 113 ('88-'89 Corvette). are ready to bolt on (no endorsement implied here). Regarding 993 Chevy heads, these castings with valve sizes were either 1. 993 SBC heads. May 31, 2002 · a lot of the 993 heads came out with 1. com. 02/1. 045 and that brought it to about 70-71cc. 50 & 1. 60 . Fullerton 383 sbc ready to drop in and go. Not 100% on valve size since the 993 casting was available with either 2. While these heads are not available new from Chevrolet, we have a good supply. 50 valves). The following information on porting deals with 23-degree Chevy heads pretty much across the board. 94 intake and 1. If you’re a stranger to these block engines, read my summary on 400 and 350 small blocks. 94. I can get these heads for about $125 one set, used, casting #. 60 GM Vortec Bow-Tie Small Port PN# 25534421 Cast Iron 2. 2. Mar 2, 2006 · The 993 sre one of the better flowing big chamber heads flow as well as 1. 50 3998993 75 CC Chambers Intake flow 150. Mar 24, 2023 · To answer your question: The cheapest way to do it would be to mill your existing cylinder heads to reduce the chamber size, or install heads with a smaller combustion chamber. Jan 1, 2005 · 406 SBC M21 3. be/q7UNH0QkxEY Nov 6, 2007 · I am off a little on the 487's. I have even installed 2. The 96 and up use the completley different L31 Vortec bolt pattern. 94 head difference 07-04-05 04:31 AM - Post# 732804 In response to Here's the specs: 3932441 76 CC Chambers Intake flow 152 CFM Exhaust flow 93. May 2, 2004 · Sorry to jump in on your post, but I have a question about the 993's. 75" Intake Valve - 882/993 Cylinder Head Introducing our 71-77 Chevy 5. The 113 'Vette head is virtually identical to the Apr 25, 2009 · Does anyone know what the flow numbers of 993 head castings are? I can't seem to find anything on them. 94s. 015, good condition. It isn’t hard to notice 882 heads are 400ci small blocks with a pretty consistent 200 CFM rating in a sports car. He goes on to say that the 993s are a good thick casting that should stand up well, if you want to run OEM type heads. 5ex. only good point about this head is it`s a heavy casting. Apr 2, 2017 · They are "993" castings. The best price I got on '993's was $130/ea. If your current heads are used up then stick the 993 heads on there. intake valve exhaust valve; 032: 70cc: 1. im getting some dart heads that are 170cc's, i take it thats larger than the 305- #416 or 350-#993 heads? Appear to be good core heads, no visual cracks. The real issue is getting the bowl big enough to feed that valve. Against the best prepared 993 head, the Vortecs are at least a 40 horsepower improvement when bolted to any bottom end. 94 valves and the 76cc chambers. Lastly I have a set of 305 HO 601 heads with 1. We can also modify your open chamber heads. They are stock. If you check you will see they have May 18th 72 date code on one, and it looks like March 21st 72 on the other. 75" Intake Valve - 882/993 Cylinder Head, a high-quality replacement part that exceeds OEM specifications. in the garage is a well used 350 wearing some heads with casting 993. Shrouding is also compounded with the larger valve. 523 lift cam hyd roller. 60 valves and then I heard people say they had the X head and they were 1. :) Apr 21, 2015 · The 993 heads are probably in the best condition as they came out my uncle's running 350 a few years ago. 2 CFM 1. "Cylinder Heads To Go" accepted used cores and their heads have valves, springs, etc. If you're determined to use pop ups and open chambered heads, use the c/n 624's w/the 2. 5 Ratio Rockers Holly 750 DP My intake is a Single Plane 2000-6500 (Weiand X Pair SBC Chevy Cylinder Heads 1972 400 SBC 333882 1. Dec 8, 2003 · Hi. he's runnin' this cam and he wants to know if the heads can handle that much lift? Thanks. chambers are thick and I can make them any shape I want. 4. You just dont have alot of compression. 50) these are highly sought after and would give you a small performance boost over your 624 or 882 heads. They have some carbon build up and some yellow/white crust in the water jackets. The heads that I plan on using right now is a mismatched set of 350 heads that have been rebuilt to be a pair. Iron Heads (same casting as Alum. Bowls will get very thin. I also have a set of 993's off a 72 350. 50 exhaust valves. 310 lift @cam for intake/exhast 102 intake and 110 lobe 1. I also have a set of Comp Cams Magnum roller tips that I picked up at a swap meet. Or from 8. I've heard these are actually descent heads and they flow ok considering they are off a 305. I plan on doing a little port work to these heads, a little bowl blending, and drill the steam holes for the 400. Sep 11, 2016 · One reason I started running 305 heads is they are newer and not as beat up as so many of the older heads. 350hp on a 350 cubic inch small block is easy to do with these heads. 95 out of 5 stars 993 SBC HEADS 202 INTAKE VALVES SCREW IN STUDS GUIDE PLATES. And he didn't mention 487 heads, which are "pretty good" heads for a 76 cc head, though many are cracked. 94 or 2. 55 : GM Vortec Bow-Tie Large Port PN# 25534431 Cast Iron 2. Also, and I think this is a big deal. I heard the vortec heads flow better then the DH. plan to run a tunnel ram (cool). 02: 1. 50 I'd see if the 993 is the thin castings before I did any machining to it. 6 valves , screwin studs and guideplates ,bigger spring pockets,downcut guides ,it would be smart to open up the pushrod holes, and THEN THE 30HRS OF PORT AND BOWL WORK!! Those heads were used with the target crate engines, and are one of the better (heavy weight) heads chevy made in the 75-76 cc range. 50 & 2. $150. 72/1. Other than than the fact the 882's are crack prone, if you HAD to use one of the 3 which of the 3 castings would you use and why? SBC Head Porting: All the Flow llWith a die grinder, air compressor, and time a set of 993 sbc heads can be improved. 8 CFM Exhaust flow 91. Dec 11, 2004 · Some charts varied in flow considerably for a particular casting. These are the castings that would have come on a '72 350 engine and came on the truck engines. And "BAM" they pump it up. Save Share Think of cylinder heads as the lungs of your engine, where air moves in and out of the combustion chamber. 60 71- 76 76cc, best large-chamber head; 1. the 601 casting I measured them at 53. 6" valves. I just remember the seats sitting up higher in the 993's. But, if you mill the heads too far, the seat angle for the intake manifold gets wonky and gaskets don't seal. 55 : Chamber See pictures Research casting numbers for specs Call or text with questions Thanks Rat rod hot rod gasser nova Camaro chevelle Chevy chevrolet 993 SBC HEADS 202 INTAKE VALVES SCREW IN STUDS GUIDE PLATES - auto parts - by owner - vehicle automotive sale - Oct 22, 2004 · does anyone know the intake runner size of #993 casting heads? are 305 heads much different on the runners? i had a pair of #416's. says to toss both the 882s and 624s when building a performance small block. _____ Oct 25, 2015 · I believe they are very similar to 993 open chamber head. My uncle recently goofed up the heads on his 355. 50. 3 to 8. Feb 12, 2015 · I'll see if I can calculate some torque numbers for you. Message. My headers are Doug Thorley Tri Ys with 2 1/2 inch collectors. it has forged flat tops . 50 Camaro Chevelle Corvette 993 at the best online prices at eBay! Free shipping for many products! Apr 3, 2002 · For reference I did look on the internet for heads and found a number of places that sell remanufactured heads ready to go. They are more preferred over the 882 head due to their heavier casting. One head is a 993, and the other is a 487. They can be had as cheaply on ebay as the cost your spending on the 993s. I don't know how much you may be familiar with SB heads, BUUUUUUUUUUUT, 74 was the LAST year for "good" production SB heads. 040. I am building a 350 + . I came across a pair of 993 heads that I am looking to use for the build. Find many great new & used options and get the best deals for Pair SBC Small Block Chevy Cylinder Heads 3998993 at the best online prices at eBay! Free shipping for many products! Basic Small-Block Chevy Head Porting. mez ilvkoy vvcjsxv ippg vys iaxtz qxxa skdjwb ejx nlwhqn
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