I’ve thought about Heli-Coil the kit is a lot cheaper than the time sert, I was thinking that most plug holes are Heli-Coiled in, to keep from stripping out the aluminum heads
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I was thinking about a Heli-Coil kit also, they are definitely a lot cheaper. I’m going to try running the hole with a 5mm tap first and replacing the head bolts. If there’s a bunch of crap in there that’s causing them not to bind hopefully that will clear it. If not, on to something else. I’m with you guys though it doesn’t seem very likely that it will fix it, but it really puzzles me because the bolts torque down and there is no play or anything anywhere, just keep backing out even with blue.
