Join Date: Dec 2000
Location: Monroe, WA, USA
oh it can happen with a set of old well used head's. the surfeces where, and warp alittle with age and use heating and cooling changing the plug's.
this is one of the most over looked part of the head's every one take's the plug hole's for granted.
try this, put a little antisieze on the plug thred's, Do not get any on the the tip!!!
antisieze can act like thred sealer, and it will prevent galling of the plug thred's, a severly galed plug thred will leak like this also.
if the antisieze work's i would think about pulling the head's and getting the fixed, if they can be, some tine in the future.
hope this help's.