Hooray!

[SSDiv6]

Originally Posted by Tim H

Huh, that's weird, because a friend of mine used to run the approved TRW L2242F30 pistons with a Lunati stocker cam and no issues. This would have been back in the early to mid 1980's. They had unmodified top domes and his heads were the #840 castings IIRC.

In the mid 1980's they still checked duration and overlap. After changing the rules allowing any duration and overlap, everything changed. The lobes, duration and overlap changed.