Thats good news Ron, I been doing some reading on combustion chamber CC's and it appears that even a small change in chamber size has an immediate impact on C.R. As little as 8-10 cc can lower (or raise) C.R. by a half a point. Therefor, I think there it IS a good idea to have my existing "Ross", forged race popup pistons milled to flat tops. Those Ross pistons are about a $100 per, with no pin, rings or retainers!
Heres a pic of the USED TO BE "round" roller that broke off the roller lifter. It appears the roller quit turning and the cam lobe flattened it out on a couple of sides. It got so thin, it broke through! Standard thinking is the roller lacks
oil, overheats and "fails". Apparently "faliure" amounts to "quits spinning". This was a roller bearing supported roller, by the way.