The worst brand of ft hydraulic lifters

diymirage said

but then why do we still need to do cam break ins with high zinc oil?

i mean, if it was just the chemical make up of the oil, we should be able to rev em and send em out like they used to
seems like there is more at play

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Because the zinc and phosphorus have been removed. When you choose a flat tappet cam, they MUST have high levels of both. You can bust one off and send it with a roller. A flat tappet is a different story. At least nowadays.