Its all about valve train geometry! Stock length (7.800) to long, recommended +0.100 (7.900) I purchased, way to long, but now adjusting to shorter 7.750 (with length checker tool) looks correct. Live & learn ... like full roller rockers now too. Ordering pushrods in hardened steel (required for guide plates) from Comp Cams (less expensive than same from Edelbrock).
