Could be low oil pressure. Do you have an oil pressure gauge? I think I pmed you awhile back inquiring about your setup and I think I remember your using an S14 SR block which has the extra oil port in the front for the chain tensioner for the original S14 SR Head which is obviously not being used with the P11 head. Hopefully this is not the case since I was particularly concern of just relying on the HG itself for sealing purposes than actually tapping or welding it shut. Let us know that you find out and GL!
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