Installing Custom Roller Cam per FABO reccomendations

Yep, rigger.... that higher CR gives a bigger duration cam more usable RPM range.

As for the lifter diameter, I honestly don't know the answer. I find it interesting that Crane has had different sets of lobe profiles depending on the lifter diameter in their Master Catalog for a long time. There must be something to it. But I have looked at the .842 and .904 profile data a couple of times and never have been able to convince myself that that either has any great advantage. Seems like you can get fast or slow ramps with either. I need to sit down later and tabulate a whole slew of these profiles for a single advertised duration (like 270-ish) and see if there is a trend. I'll try to make that easy to put in a post and share.