Im about to take my 94 z28 off the road to do a motor build and start making some good numbers. Im stuck inbetween building a low compression motor for a S/c or a turbo. other option is a high compression 383 head and cam motor. Anybody have good advice/opinions on this subject that can help me decide???

thnks

 

Depends on what you're looking for. A supercharger build will run you 2x the cost of a high compression 383, but with LOTS more power potential. What are you looking to do with the car? Any specific numbers?

 

What do you want to do with the car? Is it a street car, a strip car, auto cross/road racing, show car/dyno queen? Build it with a purpose, not to make a number.

 

its mainly going to be a street car. and id like to go high 11's.

 

for that i think the 383 would be good, i would try to keep it under 12:1 so you can run pump gas

 

You can get into the 11's with a 350 or 355...no need to go to the expense of a 383 or a FI rebuild.

A good set of heads, a good cam and a good tune will get you there....

 

What Hunter said. That's and some suspension, transmission and tires and you're golden

 

I run 12:1 on 91 pump gas with no problem????

 

Static compression doesn't dictate what fuel octane is needed. Dynamic compression does.

 

I was using the static ratio as a rule of thumb, dynamic compression can also be altered with the cam, but a higher static ratio, (usually) means higher dynamic. So I would attempt to stay under 12:1 if I were planning on running pump gas.

 

Cam size is EVERYTHING. High static compression and a small cam = high dynamic compression. High static compression and large cam = lower dynamic compression.

FWIW, I'm running close to 13:1 with a moderately-sized stroker cam and have a DCR of around 9.5:1. Runs perfectly on 93-octane.