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You should have your machine shop check the head(s) to determine if it is a reciever groove, or if the head was machined for an O-ring wire, which has been removed. Contact the prior owner if you can to find out why he did this--obviously one of the heads had to be replaced, and it would be beneficial to know why. You can then decide where you want to proceed from there. Good luck. Brian
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'86 GN w/ a RPE bullet. Just about everything else from Cotton's Performance. 10.33 @ 136.55 on first outing with boost issues. 16,000 mi. original owner.
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