I am just installing low compression head from RK to compliment the BD turbo I removed the OEM head but there was no threadlocker as far as I can see, is there supposed to be one? Also what is this black gunk (silicone??) around the bolt head?
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so I did put a gasket maker around the bolt head (loctite product), I did test it afterwards and nothing is leaking I only hope I did not put too much of it...