Posted by oldproudvet on December 02, 2018 at 09:14:21 from (74.127.157.202):
In Reply to: Bad new valve guide posted by fixerupper on December 02, 2018 at 09:00:46:
Your valve guide was not honed (sometimes in a cheaper shop, reamed or broached) to the correct valve clearance. If the OD of the valve guide was greater by to much on the bore in the block it's to be pressed into, it can become distorted. The engine warms up, the valve guide expands, narrowing the clearance and the valve will stick. You want around .003" on a valve to guide clearance. Someone is simply not doing their homework. If the shop is using a reamer on a cast iron valve guide, it will wear very quickly and not clearance properly. Honing is by far the best procedure.
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