difference in heads - Team Camaro Tech
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post #1 of 12 (permalink) Old Feb 5th, 08, 04:27 PM Thread Starter
 
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difference in heads

hey i new to this forum i just want to ask a ?
what are the difference in heads on a 350sb?

i just got a 350 from a friend that came out of a 73 nova... he said its pretty stock, just mild cam, bored at 40 over..... this week i will be taking it part really see...... i want to bring the hp to about 375-450. not sure which heads to run.....

any suggests would be greatly appreciated
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post #2 of 12 (permalink) Old Feb 5th, 08, 05:17 PM
 
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Re: difference in heads

Imho, an about 9.5 to 10 to 1 CR'd 350 w/ no more than a set of stock, 64 cc medium valve double-hump heads and .015" to .020" shim headgaskets, a decent cam like a good old CC 270 Magnum or a modern 268 VooDoo, a stock Q-Jet intake system and a cheap set of 1.625" dia., 4-tube, long headers uncorked should do you fine.

I haven't ran any numbers, but still figure you will really be happy!!

More power, 180 cc intake port heads that set the CR. right at 10 to 1 for said cams!!

pdq67



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post #3 of 12 (permalink) Old Feb 5th, 08, 07:43 PM
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Re: difference in heads

You can find factory sbc heads with combustion chambers from 62cc to 76cc which will raise or lower compression.(Higher cc lower compression, lower cc higher compression) All sbc heads made 69' and later have the accessery bolt holes in the heads for the passenger side altenator brackets. There are also different valve sizes: 1.50 exhaust/1.94 intake, 1.60/2.02. The intake ports for most factory heads are no larger than 170cc.
The double hump heads are one of the better factory heads to use. Then use an air gap intake with a Holley 650 or an performer RPM spreadbore if you use a Q-jet. Then a Lunati Voodoo 268 with lifters and valvesprings. Long headers with a good exhaust. This should get you to around 350hp. If you want over 400hp I would start looking at Afr 195cc heads and possibly a roller cam.
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post #4 of 12 (permalink) Old Feb 5th, 08, 09:17 PM
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Hank
 
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Re: difference in heads

First off,I would not use factory heads.
Second,the newer Vortec heads 96-99 are better(flow more) than any Camel/double/peanut humps,or 041 or 441 heads.

By the time you do all the work & $$$ to freshen up those used heads you can purchase new cast iron heads & BTW,,,,,they are new.

Talk to my friend Dave or [email protected] West Coast cylinder heads 818-705-5454
They can order you any set of heads you need. They will give you a great recomendation for heads also.
http://www.proheads.com/
tell them Rick sent you.

MBHD

Chevy 250 turbo EFI

Last edited by mean buzzen half dozen; Feb 5th, 08 at 09:38 PM.
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post #5 of 12 (permalink) Old Feb 6th, 08, 05:23 PM
 
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Re: difference in heads

Sorry, missed the 450hp top hp number so please carry-on!!

I was going by 375 to 4 is all.............

pdq67



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post #6 of 12 (permalink) Old Feb 7th, 08, 11:36 AM Thread Starter
 
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Re: difference in heads

these are the 2 that i have came a cross, vortec cast iron 64cc Chamber, 170cc Intake and vortec Bare, 66cc Chamber, 215cc Intake.....

both for a little of nothing....... so would these be suitable for what i need and what would be the rwhp
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post #7 of 12 (permalink) Old Feb 7th, 08, 04:08 PM
 
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Smile Re: difference in heads

SB factory heads can run from 52 cc's, (305HO, -601's), to up to 80.+ cc's, (400 P/U heads).

And as small as 118 to 120 cc intake ports, ('56, 265" -306 trough sparkplug), to as large as 170+, (-461x double humps and now Vortecs)..

Anything else is either an "over-the-counter" GM head like said 215 cc port jobber OR an aftermarket!

If you can buy the 215 cc I wanna say "Bowtie "fast-burn" Vortec type" for a song AND they are good, JUMP on them FAST!!

pdq67



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post #8 of 12 (permalink) Old Feb 12th, 08, 03:54 PM Thread Starter
 
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Re: difference in heads

let say the bore is .040 cam is 262/ 272, Lift .420/ .442, and i use the 215cc vortec heads with long tube headers what would it put the hp close to........

and thanx for all the advice
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post #9 of 12 (permalink) Old Feb 12th, 08, 05:53 PM
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Tom
 
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Smile Re: difference in heads

Vortec heads might cost you more than you think. They require a different intake manifold, they require different valve covers, etc.

A 215cc runner head is too large for a 350 that is used for the street. 180cc or 195cc runner is plenty.

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
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post #10 of 12 (permalink) Old Feb 13th, 08, 04:41 PM
 
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Re: difference in heads

You will be WAY mis-matched w/ a Performer cam and a 215 cc port head!!

A stock 64 cc chambered double-hump head along w/ -12 dished stock pistons and .020" thick shims will be a dandy combination w/ a Performer cam!!

At 9.55 to 1 CR., w/ bowl-blended 1.94"/1.50" 64 cc heads, a Performer cam, a stock 750 cfm Q-Jet intake system and a cheap set of 1.625" dia., 4-tube, long headers uncorked and you may be looking at 349hp at 5,000 rpm and 421 t at 3500 rpm!!

A REAL SWEET STREET ENGINE, IMHO!!!!!!!!!!!

It's really just a step up from the great old 295 and 300hp/350 L-48 engine's of old!!

pdq67



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post #11 of 12 (permalink) Old Feb 14th, 08, 12:06 PM
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ted
 
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Re: difference in heads

I hope I am not doin' a hi-jack of your thread, but, in PDQ's reply, I would like to know what he would consider a "stock Q-Jet intake system??? Cast iron or aluminum??? I have sitting arround a cast intake 346249 circa '74 and a 14007378 aluminum Vette intake circa '79. Other than the obvious weight difference, is there any advantage of one or the other using a 750cfm Q-Jet... I have a feeling that the Q-jets were / are a carb that will be gaining in popularity quite soon as they are very tunable and a great carb if set up right... Gosh dang it, look at the numbers stock/superstock guys are putting up with the venerable Q-Jet... I guess if PDQ misses this reply (of sorts), I'll start a thread on the cast/aluminum Q-Jet intakes.... Signin out for Now!!!
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post #12 of 12 (permalink) Old Feb 14th, 08, 04:56 PM
 
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Re: difference in heads

Back again,

I've read where guys have said the later aluminum Q-Jet intakes w/ the EGR port tend to warp??? Don't know??

I do know that an early cast-iron Q-Jet intake is fine except that it flat weigh's more is all.

And, imho, the BEST cast-iron intake GM made back then until they came out w/ the much later Marine Z-28/Q-Jet type intake is the old 300hp/327 AFB intake that was replaced by the first Q-Jet like my engine had originally.

I have one out in the garage and to me even tho it's totally Old-School, it's still a good one!!

pdq67

PS., and I also figure that I can install an aluminum Q-Jet adapter on a cast-iron Q-Jet intake, then bull-nose the top down, way back into the ports and increase it's air flow a BUNCH....



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