I know they ground me a cam that ran High 9's with the linelock locked up!!!
That was in a mustang with a 351C in it.
They had ground me the same cam Bob Glidden was using back in 73
when he won the world championship.
Glidden was using a destroked 351C down to about 330 and it was not long before we found out why he destroked it. We kept cracking blocks in the lifter galley with the higher RPM's. I imagine the shorter stroke stop the craking there.
We ended up going with a smaller cam and lowering the RPM's below 7,500 to stop the craking. I guess the destroking took alot of stress off the blocks for Glidden.
Kurt