[Alan Nyhus]

Al, what Alan is saying is that NHRA has changed the rules on stocker valve springs. You no longer have to comply with the specs. listed in the NHRA Blueprint Specs. (pressure, spring style, etc.). You also don't need to run stock style rockers (roller rocker arms permitted). From the current NHRA rule book:

"Any valve spring permitted, provided no modification to head is performed. Steel valve-spring retainers mandatory. Spring cups permitted ONLY if no modification to head is required."

If you got your parts before these rule changes, make darn sure you talk with Comp. Cams to make sure your springs are up to the task. Keeping the lifter in contact with the lobe is critical with these motors. -Al