Originally Posted By 383man
I have always used Valvoline VR1 racing oil and a bottle of zinc additive when breaking in a new eng and flat tappet cam. I have never wiped a cam lobe. Course I don't build as many engines as a machine shop but my sons eng and my last 2 engines were all broken in that way with no problems. I also use the Valvoline VR1 racing oil all the time in my engines. Ron


you break-in without the inner valve springs?