How hard will it be to take out the 305 and swap in a ZZ4? Can I still use the TPI? I have A/C and wish to keep it is this possible? I am not doing this anytime soon but am looking to do this. I will do it once I get out of HS where I am going to enroll in UTI to become a mechanic. What is involved in doing this swap?

 

Hmmm, somehow you got ignored.

Check out this thread https://www.thirdgen.org/techbb2/sho...threadid=96015 . It's geared towards a certain performance objective, but most of the info applies.

The main problem you're going to have is that the TPI is a lower RPM system, while the ZZ4 is intended for higher RPM power. But, TPI improvements will get it there.

I assume you have emissions concerns. If so, the EGR will need to be fed via an external tube from the exhaust to the intake because the ZZ4 heads don't have exhaust crossover passages. But, the same situation existed on Vette TPI engines, so it's not uncharted territory.

 

five7kid is absolutely right about the stock TPI... it will just choke the power of the zz4... to make it run right a new intake, exhaust including headers, injectors, and torque coverter are musts... just to get started...