Best Years for the 318 LA?

Bodyperson said

How about a vote on how roller cams are over rated. I think flat tappets are getting a bad rap due to dirty builds and poor break in procedures.

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I'd be curious on "over rated" in what way? Performance? Durability? Cam Break-in procedure? Running basic oils that are common and not high in zinc? Not arguing, but curious on your thoughts? Cost is about the only thing I can think of where a flat tappet cam has the advantage over a roller.