The sonic check will not tell you anything. But will make the machinist richer for nothing.
I have cut many sets and never had one crack.
Do the 1.94" valve job first. As the mill limit is the edge of the new 1.94" valve seat in the head.
The net valvetrain geometry improves. its equal to a longer push rod.
See the pic. I actually build these engines. Have for many years.
This is a easy 12sec et performer.
Last edited by F-BIRD'88; 03-04-2013 at 01:27 AM.