Ok can some one tell me if it is possible to build a 327 with 350 HP without having everything Forged would 64cc heads work well what about pistons and cam what lift of cam would I need and what kind of pistons flat top or dished? what compression ratio? I also want to run pump gas.

 

easy. single plane intake, big cam, rev it to hell. '68 and older 327s cam with forged small journal cranks stock. they are about $1500 from PAW.


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The GM replica (ormaybe OEM from GMPP?) cam from the original 327/350 motors would probably be a good start...

 

Actually, '68 was the year they came out with the large journals. The stock crank is fine for 350 HP.

Flat top pistons with 64cc is about 10.25 CR (premium pump gas required). Cam would require close to .5" lift and about 220 @ .05 duration. Vortec heads w/screw-in studs and upgraded springs would probably make all that work nicely.

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flat tops and 64 cc chambers do not yeald 10.25 to 1 it makes 9.2 to 1. any ways. realy good flowing heads like 292 turbo heads, any camel humps, 993, 441, 882, or any after market heads. realy good flowing heads is a key componet in build a good high perf motor. 10.5:1 to 11:1 would be good compesion ratio, anything lower and you would not acheve 350 hp. as said befor the 350hp 327 cam would be a good start however i would recomend a 270 grind comp cam shaft. Vic Jr intake or a perf rpm, and a 650 holley. hope this helps

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when the green flag drops the bull$hit stops

350,performer RPM intake ,650dp, 700r4, headers, 3inch exhast

 

All above is great info just throw out those head casting numbers. I can't believe that 993, 441 and 882 smog heads are being compaired to 292's.

Take a look at what GM did for the 327/350hp L-79's

11-1 CR, .447 lift 221* at .050 hydraulic camshaft, 492 heads (I think, could have been 461 or 2's), an intake that closely resembles a Performer RPM and a 780 mech. secondary carb.

 

I agree with Wardo, you're not getting 1.1 HP/CID out of anything with a set of 882s on it. They're garbage.

The best heads for a 327 as far as junkyard models are the 292, 041, 186, or 492. All of those are double-humps with accessory bolt holes. As you will probably hav more in a set of those by the time they're ready to use than you would in a set of new aftermarket ones, you'd do better to get a pair of Edelbrocks or AFRs or something. I don't think the Vortecs are the way to go because of the amount of machine work required to prep them adequately for this application; Fast Burns would be an option though. You'll need flat-tops as a bare minimum; IIRC you end up with about 9.3:1 with those and 64cc heads as all those above are, which is at the extreme low end of the range you need to be in. Something with about a 8-10cc dome would help get to the 10.3-10.5:1 range.

The GM flat-tappet cams suck, plain and simple, especially compared to ones that have been developed in the latter part of the last 30 years. A better choice would be a Comp XE274H, or even better, a roller with about the same specs; or for the best of all, go solid, either flat or roller. Big springs are essential, and roller rockers would be a major plus. Being a relatively small motor, a 3310 (750-780 CFM in its various incarnations) carb would be good. 1-5/8 headers would be appropriate.

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"So many Mustangs, so little time..."

 

hate to tell you this guys but acroding to this book i have on small block chevy cylinder head modifacatons, with only monor work to the intake runners, 3 angle job, back cut the valve, and some other valve triks a set of 993 can out flow simler modified 186 castings. i also read that mild motofied 441, 993 can out flow L98 heads. so there

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when the green flag drops the bull$hit stops

350,performer RPM intake ,650dp, 700r4, headers, 3inch exhast

[This message has been edited by GOLD85 (edited October 22, 2000).]