Turbo size help

[flynbrian]

I have a 67mm Garrett on my 350 chevy and it falls into the range you want. Its got a .70 a/r compressor housing and a .68 a/r exhaust turbine.
It boosts right away and makes alot of power....Mine is a T4 flange set-up.
I also have a 76mm Precision T4 turbo with a .75 Compressor A/R and a .96 Turbine A/R It will be going on the car later on....

Right now my 350 is basically a stock 1974 L65 motor. Stock cam and compression anyway.

You will want more turbo than my 67mm

A 60-61mm turbo is too small for a 302 Ford let alone a 350 chevy.



A 67mm with a .81 exhaust turbine would work real well for you. My .68 turbine is creating boost just a few hundred RPM over idle...Its like a diesel truck.

I also run a 2.73 gear...

A Engineer at the office I work in calculated my combo at capable of 540 Horsepower. I doubt my stock cast pistons will go that far...But oh well its fun for now.