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I can see where the cam bolts were rubbing on the stock timing cover.

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The first thing I'd be looking at is the length/thickness of the bolt head as that could be the issue. I've had allen head capscrews that hit the cover on install and had to use bolts with a thinner head. Just a thought before you assume the cam is walking.

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We recommend always checking the cam bolts for clearence at the cover even if you use a button.We almost always find most need the heads trimmed down.