Quote:
Originally Posted by 40 Deluxe
On a flathead engine I suspect that, if anything, clearances are going to tighten up with miles as the valves wear into the seats. Not much else there to wear. The heel of the cam lobes will never wear, nor will the stem and lifter faces. If the bottoms of the lifters wear, kiss the cam goodbye in short order.
On overhead valves, clearances can get larger with wear: pushrod tips, rocker arm faces and pivot points all wear.
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Plus one. Flathead will loose clearance.