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Oil drain hole? That appears to me to be the passage that feeds oil(under pressure) to the ex. tappet block. It is missing the little sleeve. I have blocked it off when using aftermarket (hardened) cams,as it is not needed with them and helps with oil supply to the rods by not wasting it. Jack
 

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Discussion Starter · #4 ·
I just heard something bout people blocking them off if the jugs are earlier ones say 68 crankcase with 66 jugs..
 
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