This is kind of a sticking point in planning this build. Szilagyi in "How to Build Big inch..." states that the stock Magnum rockers are good to about .0525" lift. I don't really see the need to go bigger. My non-ported RHS heads don't flow better above 0.500" lift. And I'm building a street cruiser that will emphasize torque over top end HP. I look at what's out there in the way of upgraded roller rockers and read stories of poor valve tip contact. Some great some not. I contacted the member here who makes correction kits, but these do not apply to Magnum heads. He had no suggestion for a rocker arm. I'm not convinced there are enough performance or durability gains with roller rockers to matter to me. Choosing to go stroker is going to put me well past the power satisfaction point. I'm confident my combo will make 450 HP / over 450 TQ with a cam in the under .525 range, and wringing the last bits out of it is not my goal. Not planning to rev past 5800 or so. I do want reliability. I'd like to know what folks think about this idea that the stock rockers are OK at up to .525" lift.