Could someone please enlighten this ol' fart who grew up on flathead V-8's with 3/4 cams, what a 30/70 cam is. I can understand degrees duration, openings, closings and overlaps. Many thx, Bill Barnett '53 BN1M A Carmine Red one. ;-) sebring at illawarra.hotkey.net.au wrote: > Cam is 30/70 and quite big numbers for a BMC boat anchor.