[X-TECH MAN]

Originally Posted by SSDiv6

Opening a can of worms...

With the current camshafts in used, there is no way the valves will clear the piston dome. Many years ago, in the 1900's, a racer asked me to stop by his home to check why his new Crane Cams Stocker cam would not clear his pistons.
He believed he was doing something wrong. After checking the cam, the cam was not the problem; it was the piston domes. After making a few phone calls, I learned many were having their pistons flycut to be able to run the cams.
Having compared the current approved pistons versus the original, and they are very different. I assume someone may have sent a modified piston to NHRA to get approval of the alternate approved pistons.

Yepper.......That's how it happened !