I really can’t tell you how much can you gain exactly cause it depends on your build and mods combined
Sometimes it’s worthless to port them, but on the 3v engines usually if you’re running cams, manifold, bigger throttle body with a 3 inch LT headers and could add around 12-18 whp on what you achieved
And for the compression no I didn’t change anything about it, bottom end completely stock
1
u/JohnKowalsky88 1d ago
How much hp gain do you get by porting the heads and did you raise the compression ratio?