Got the one plug that was 3/4 of the way out after is soaked overnight. Looks like some gunk baked on the threads was holding it in. The other plug is still putting up a fight big time. I noticed some oil/carbon buildup on the head around that plug and it doesn't feel like it's seating all the way into the head so it may be crossthreaded or at some point in time worked it's way loose and some carbon is baked on the threads. I think I do have a slight exhaust leak when cold and it might be that plug. It still runs pretty darn good but it would be nice to get that out if it's just carbon buildup holding it in.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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