Quote:

thanks for posting that rear wheel dyno result

is the 5 hp gain
with the Extrude Hone exhaust manifolds
about 1.5% or so
of the maximum horsepower?



Didn't sound like a rear wheel dyno. Could you clarify, Scott?

Because the motor is built out to 426 cubes I wonder if the 1.5% might not be applicable to a smaller cube motor with less HP.

Would it be applicable to a smaller cube motor with the same HP? That motor would have to a combination of more heads, cam, etc to acheive the same HP I assume.