If you’ve been in the engine and racing business long enough....... you’re going to be involved with a few flattened cams.
I can’t think of a single one that went bad that we didn’t find what we felt was the “cause”.
I’ve never had one go bad for “no reason”.
The last few I’ve seen go bad(I didn’t build these engines), two had inadequate lobe taper, and one had questionable break in and was being run with the wrong oil.
And of the two with inadequate taper, one was basically surviving even though there were a few lifters not rotating.
The other one had a lobe start showing wear off the nose in about 50 miles of use(which was found during some tear down for an unrelated issue).
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