390 w/open chamber heads

Hi Treblig,

with the Performer, you could open up the ports to the 360 size. With the 390, you're looking for a torque monster right? If I'm thinking correctly, you could open up the ports on that Performer an inch or so into it and I think you'd have excellent port velocity starting right at the plenum! That, my friend, would create gobs of torque....someone correct me if I'm wrong? Also, might consider adding a 1" spacer or so to add some plenum volume....again, someone correct me if I'm wrong.

What carb size were you running again?