Originally Posted by MalibuMike
Okay well the same guy says he has a set of GM part number 3964291 rectangle port heads & I found anotha guy with NEW ROSS RACING PISTONS ALUMINUM FULL FLOATING. CNC. MACHINED. SKIRTS THAT ARE. 060 454 OPEN CHAMBER PISTONS PART #80001,NEW EAGLE H BEAM RODS PART. #CRS -6135-S, and SPEED-PRO RINGS... How does this setup sound for horsepower?
You have one of the best oval port heads GM produced. The 781's would be better for a street engine.
Those Ross pistons would give you a 13:1 compression ratio which will not run on pump gas. The rods are not needed on a street driven engine, its just overkill.