So, not to side track the conversation too much.....

But the simple geometry of a roller lifter suggest to me that a larger diameter roller (I.e. 0.815 verses 0.750) on the same lobe will move the valve faster. Correct?

If this is correct, when you order a Comp Cam roller cam with specific lobe numbers from their master lobe catalog, do they grind it differently for a Chrysler vs Chevy (0.815 verses a 0.750) lifter roller? Otherwise, their catalog specs would only be correct for one roller size.