Please don’t take this wrong,,,,but isn’t that amount of lift a little high compared to the stock grind Purple Shaft ?
I’m not against more lift,,,I’m just wondering why it has to go to over .500 ?
The lift of a camshaft at the lobe is the overall height of the lobe minus the overall width of the lobe. When you start regrind cam lobes there is only so much you can do with them. However the roller is easier to change around because the lifter can follow a more aggressive shaped lobe profile than a flat tappet can. .506" lift (.506/ 1.6 rocker ratio) equals .31625" lobe lift and since you're grinding away at the lobe sides (making it more narrow) to change the characteristics you're adding lift because it's lobe height minus lobe width to get the total overall lobe lift. The whole grinding/ regrinding process is very interesting how it all works. That's my guess why it ends up at .506" lift, but also if you're regrinding you probably want more lift for performance. I am sure they could make the lobe height shorter and get it back in the .480" lift range. Duration is far more important than .026" of lift is going to matter.