DWRAT is 100% correct. Wiped flat tappet (mech and hyd) cams have become quite commonplace in the last 20 +/- years due to manufacture changes in motor oils to reduce
zinc and phosphorus levels to protect catalytic converters. Some guys have wiped out 2 cams out in a row before finally biting the bullet and converting to a roller cam. A flat tappet cam will still work but you have to be careful with break in
oil and then continue to run an
oil with elevated ZDDP levels such as Rotella 15W-40 diesel
oil, or Joe Gibbs, or Brad Penn oil. There are some others still around with high ZDDP levels but you have to do some research to find them or risk a very high likelihood of wiping a cam lobe or two out.