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Good question. Not just about oil leaks but also good retention if the bore is damaged. Is there a speedy-sleeve style solution? Making larger shafts is a fairly simple project but it is still work, and the devil is [always] in the details...
I saw a post about a service boring for larger journal cams, that guy should have good thoughts on this.
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Art
'75 911 US Carrera #390
'74 MGB, AH 3000 BN7 V8,
'65 Mustang Fastback, 66 bronco U13
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