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Old 09-21-2021, 07:50 AM
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Originally Posted by Gaz64 View Post

Considering not one other member here including one FE expert (Brent Lykins) has seen this happen with this type of guide, points to a metallurgy issue, when your guide batch was made.
Or perhaps number of cold starts versus run-time at operating temp.
Oliver, is there a stamping on the outside of the valve guide that is visible? For instance, the Edelbrock guides (which it is said you do not have) often have the number 39-1119 on the outside. Of course the inside diameter of that particular Edelbrock guide is already too big for an 11/32" valve. But it would be interesting to know if your guides have an identifying stamp.
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