Old 06-25-11, 01:07 AM
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you might want to think about taking it to a shop with a rep for excellent repair work. machinists can perform an operation called knurling that could remedy the problem. they just make helical grooves inside that pooch out the metal rather than cutting it out. makes the ID a bit smaller is all.

oh, i just remembered, i had this done to the valve guides on a '61 MGA head. back about '72.
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