Best turbo engine?
 

What is the best engine setup for a GT91 turbo?

Depends on what you want from it. Gonna need a far bit of cubes if you want it to spool quickly. Definitely could use a something north of 400. I think NP had a truck with a 370 with that turbo if I remember right.

Yeah I thought I would need more cubes. Not sure if I want to sell this engine and build something different or stroke it.

Is this a something you plan to put a lot of miles on? IMO, it's tough to beat a well built 365-370 for power AND long durability. Strokers will make more power, but I have seen far too many people having issues with piston skirt wear and oil consumption when used as a dd in a heavy truck. A well thought out forged 6.0 can get you well over 750rwhp that will also last for lots and lots of miles. I built my 365 at 10:1 comp. with 4032 pistons, and bone stock 317's and stock truck intake and tbody and make 650rwhp and run low 11's with no traction at only 13 psi. At 18psi and better traction, I'm sure it will be even more fun! The 4032 pistons make it quiet due to being able to keep the piston to wall clearance tighter, and last a long long time.

Im having AES build me a 390, after a few phone calls i think i will be very happy with the outcome. Give Fraser a shout he can point ya in the right direction.

I have a forged 370 in there now. I'm not for sure if I want to stay with that or go with something bigger. I don't drive it all the time but would like it to be reliable enough to drive if needed.

AES sounds like a very good option.

a big one would be my first inclination...like 427+

but small engine big turbo makes some pretty beastly track setups whereas I would prefer bigger engine/ smaller turbo for a street truck.

WHy are you set on the Gt91?

What about halfway in between? 390?? I'd love to do a LSX 427 but that will cost alot to build. Unless I can get some decent money for the used stuff.