Paging Mike from MMS
Right now on a 385ci motor w/ a 3.85" pulley we are seeing 11psi @ 5500 rpm.
I'm assuming it's stock displacent? Also RPM will depend on the pulley size. Boost tends to climb quickly that last 1000rpm. Once we get a fuel system for the car were doing, it will probably be about 13-14 psi at 6700 RPM.
I would think that a 3.60" pulley would work best for you. The blower pulleys aren't that expensive. We are using a Gates K060408 belt with the 3.85" pulley. You'll probably want ot go 1 size smaller for a 3.60" pulley.


