Rizzle wrote:If my math is right (good chance its not) you'd have to spin the 421 just over 200rpm more for the same hp numbers, with the same parts.
Or, with the same hp/torque peak rpm numbers, 97% of the power. But very simple math, so I'd like to see what others say if its correct or not.
Is that a typo and you meant 3.875" stroke?only go to 3.785 stroke
Eric68 wrote:You can build a 3.875 stroke 427 with a 4.185 bore. The larger bore is no problem with your block. You can also use a shorter rod to get a taller (better) piston. With your heads I don't expect that you would be rev'ing it to the moon anyways.