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Excellent replies, all. My cam is the ZZ4 gm cam. Steel yes but I don't think billet. Yes GM specifies use of a melonized gear and I will most likely use the Lunati everwear gear. I use a standard volume oil pump as I didn't build my engine loose. I have used several distributors. The MSD HEI I...

OK. Lifters slide plus rotate as they have a slight crown (when new). In the case of the SBC, the cam is always forced back, towards the rear of the engine, against the distributor while rotating the gear and spinning the rotor as well as the oil pump. I wonder what the pressure is between those...

OK, I just want to ask how ZDDP in earlier SG, SH and such oils(or break-in additives) helped flat tappet lifers survive 100+lbs up to 300+lbs of pressure, thousands of miles without destroying the cam or lifters in short order?? But that same ZDDP can't seem to help a regular cast distributor...