Thanks Jon and Jerry for the formula......

What in your opinion is the efficiency factor in a stovebolt 6 like a 261????

From what I have calculated even at 4000rpm the single barrel carb is all it can handle.....

...then how do they manage to get more HP by using small 4 barrel or 3 single...???? is the volumetric efficiency increased by modifying the cam...??? and polishing and tuning the ports... then opening the otherside with tuned headers....?

Seems that a standard stock 6 almost has a built in rpm limiter....

Bob C.
....trying to learn!!!!!


Bob C.
CMP Heaven
The Hammond Barn