Strike 2. Gross leak out the side. When I got the heads off the o-rings stated put and looked. The issue appears to have been time, maybe it could be solved with technique, not sure. I coated the deck the shim, installed the shim copper and o-ring, then coated the top od the shim and head, assembled and torqued. It looks like the 518 began to set in the thicker areas that made contact as soon as I set the shim on and by the time I torqued it was too late for the material to flow and seal. Then it took forever to clean it all off.
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Hylomer blue on 1 head, hylomer M on the other cuz I didn't have enough of either. The copper ring and 0-ring stuck in place nicely and unlike the 518 I can see it oozing out a bit so even though it gets really thick really fast it does seem to flow like they say it should. The heat gun is on the gage plate, in a couple hours I can add pressure and see what I have.
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