Originally Posted by BEAST477
You can take a stock block more than .030. I've had two that were .100 over with no problems. You can go as much as .125 over but i would get it sonic tested first. A .100 over with a 4.25 stroke is a 505 a .125 over with a 4.25 stroke is 511. Just some ideas.
you are right, back in the day, that was what we called a big cube motor.
