Roller Rockers 1.5 vs 1.6

IMHO, the OP’s setup is okay with the 901 type springs that the cam calls for. But going with upgraded 1.5 rockers (and by that I mean good quality stiff rockers with consistent ratios) and geometry correction won’t hurt anything. There’s some talk about a different engine being built, so if swapping these heads and rockers onto an improved short block are part of the plan, I say to go ahead and upgrade and have that much out of the way. But I would probably be looking at saving up for a little better rocker than the SM/ProComps. So, what are the plans for an upgrade? Oh, thanks @PRH, loving the calculations that show exactly how much extra clearance that they increased ratio rocker will use up. I’ll be needing to use some of those myself for a nice solid cam upgrade. I got a set of used SM steel 1.5 rockers, so I’m going to get find out how those work on some factory 976 casting heads.