what would be the biggest motor a tc78 could run on and push 15psi? with say a 1.52 divided a/r housing. that's the biggest they may make for the 68mm f1 turbine wheel.

 

Depends on how much RPM you want to turn it.

 

A buddy of mine is going with one with a 408 oh its a front mount. I would say on a 370 it would be pretty stout

 

6000rpm. don't want increased stress on driveline.

 

Did you call and make sure you could get that housing? The biggest they would send me is a 1.15 with the 68mm F1 turbine. That combo is still worked pretty hard on a 370. I just do not see the point of that turbo with a 400+CI engine???? With the 370 you can make boost at 1800 going down the road lol.

 

i'm just really thinking about going to a 4" bore because there are alot of nice heads for 4" bore.

 

so the turbonetics guys feels confident that this turbo will supply 15psi to a 402 and pull to 6000rpm with out excesive back pressure.

 

I think it will work ok. Just a tad small

 

I think it would be fine on a 402 with only spinning it that fast. I like to keep turbos a bit on the small side in trucks any way, just so your in the usable power band of them any way. A big turbo is great if your building a track only car and can launch with a 2 step all the time, but for a street driven vehicle like your truck, a smaller turbo on a bigger motor is WAY more fun! Almost no lag, but still has a descent top end

 

A 370 is a 4.030 bore so you have the same head choices as a 4xx engine.