I just got my head back from a local machine company. They hot tanked it, did a leak down and resurfaced it. They said it was sealing good. The cam in it has been in it for 15k and looked great. When I picked it up he mentiined that because it was a flat tappet I need to use a zinc oil. I asked him why, and that I thought zinc was only needed for break in. He replied saying that it should always have zinc in these 80's flat tappet cams and nit just for break in. I never heard this before can anyone shed some experience or opinions on this? I honestly think he just wanted me to buy his 5 dollar a quart zinc oil.
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