hey guys...i have a 1991 Z28 with a 305 tpi...i want 2 swap out that week piece and swap in a new 350 crate from gm...preferably with a 4 bolt main...preferably roller...i want 2 keep my induction setup (but obviosly beef it up) now what crate motors or out their that can utilize the same accesory brackets? i want to keep the center bolt heads 2..i just wanna go with vortecs...its just been a pain to find the newer style 350 everywere i looked...so what are you guys running in your tpi cars? thanx in advance

 

If you're looking for a crate motor with 4 bolt mains (used in most new motors from GM) and a roller cam (used in most performance motor from GMPP) I would look at the ZZ4. It puts out 355hp and very good torque (I can't remember the numbers at the moment). That motor is best suited with a carbed setup, but it will work with fuel injection also. If you want to go FI, you'll have to ditch the stock FI (TPI/TBI) and go with a good performance setup (DFI, SR, etc.) since the stock units can barely feed a stock motor. You will be able to use all your old mounting brackets on any engine as long as the heads have accessory mounting holes. The ZZ4 has centerbolt heads (aluminum). If you're looking for a motor with Vortec heads, then the 350 HO has them. It puts out good numbers (330hp/380ish tq) and it has centerbolt heads, plus it's cheaper than the ZZ4. I'm not sure if it uses a roller cam though, I'm thinking it doesn't.

 

They have this one.

vortec

 

It is only a 2 bolt block, but they will handle a lot of more power then most people think.


I went with the ZZ4 motor and SuperRam.