Quote: I would have thought that engines produced in the late 60's that were subject to a "core shift" would have been disposed of long ago by attrition or warrantee claims. I'm finding that some of these may have survived.
Has anyone experienced Core Shift in an engine block (383, 440, etc.) that did not become a problem until years later when the block received its first 30 overbore? By problem I mean overheating or cracked cylinder wall.
Your engine builder tells you it's lean, you don't have any idea where or how the tuning is withthe carb and your running ethanol gas?
Yes lean will cause it to run hot, sure he!! Will.
Is is not core shift IMO
Learn to tune your carb is my suggestion.
Post your jets needles here we c an tell where your at with carb.
Why don't you believe the engine builder? He knows your motor best.
