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Old 10-28-2012, 08:27 PM
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Need Head advice for a supercharged build

I have a Chevy 350 in a 1980 Trans Am, I was originally planning on Supercharging it and I have a Weiand 142 supercharger. I'm just wanting to build a mild street car in the 400hp range.

I got the Weiand 142 since it goes on mostly stock engines without a problem. My 350 is a 72 Camaro block, with mostly stock internals. The guy I got it from said it was bored 30 over but I'm not sure about that. Now just a few days ago I found out the heads are off a 305 that was in an 86-92 Camaro. Casting number is 14101081

I'm thinking these would probably be horrible heads to supercharge with. Everyone says 305 heads on a 350 will raise the compression ratio way up.

If these won't work, what would be some decent cheap heads to go with the supercharger? Or could I get away with these heads if I just always run 93 octane and keep the timing in check? I was going to run the MSD ignition retard controller for the timing.

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Old 10-28-2012, 09:57 PM
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You need to find out the actual bore and piston-to deck height measurements so we can calculate your compression ratio. "305" heads aren't all bad either. With stock bottom end i wouldn't run much more than 4lbs of boost though.
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Old 10-28-2012, 11:10 PM
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You will need to get your static compression ratio down into the 8.0:1 to 8.5:1 if you want to take advantage of what a blower has to offer. You'll never get there with small chambers on a 350. An 18 cc dished piston and a 76 cc chamber will yield a SCR of 8.0:1.
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Old 10-28-2012, 11:34 PM
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what would be some decent cheap heads to go with the supercharger?

on a used engine? sounds like you are setting yourself up for a broken engine? Why not rebuild your engine and blue print it with good parts for reliability?aim for 350 horse then add that little blower and have an honest and reliable 470 horse daily driver that has a nice idle,good sound and fair economy if you can resist using all of the power???
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