Here is some stuff that I've put together while looking around Comp cams lists 65 up as 6.875 [flat tappet] 85 up as 6.250 [roller tappet] 302 retrofit roller 6.400 Crane says 63-68 as 6.812 [flat tapet] 69-95 as 6.875 [flat tappet] Take it for what its worth I can't swear to the info Later