[charlie66]

Originally Posted by gtofreek

One other thing to consider. Look at the intake lobe of the same cylinder to see if the opening side of the lobe is starting to do this also. We had an issue like this[exhaust lobe worn on the closing side, intake worn on opening side]. Turned out that these copper cam cores are only hardened on the surface, and only so deep[black cam cores are hardened all the way through]. These cams need to be ground within a certain lobe separation spread for their hardening. This becomes more of a problem with small duration lobes like you are using. The smaller the lobe, the more they have to grind off. If they spread the lobe sep out further than what the cam was designed for[say a 114° LS, when cam was designed for 112° max], they grind through the hardening, and the result is the exhaust lobe wears on the closing side, and the intake wears on the opening side.

Are you at least running a stud girdle? Shaft rockers are obviously the best, and if you go that route, be sure to upgrade to the steel bodied exhaust rocker, or rocker breakage may occur.

I was told that this cam was hardened after it was roughed and that it was .120 deep. Meaning that it was hardened .120 deep into the cam. Who knows really though....