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Ya never know. Friday afternoon, and the guy is thinking about the weekend. Monday morning, and he's tired from staying up late Sunday night. **** happens.
Gotta ask, do you screw with RTV on the half-circle spots when you put the valve cover gasket on? It takes me forever to extract it all to re-seal the thing if I have to check the valve clearances..
Wow you've come a long way. Sorry if you mentioned this- Just skimmed to catch up. (Don't holler and throw **** for stupid question, but) Are the rings directional and could one on number 4 be upside down?
How dirty is the inside of the intake manifold? If it's not the turbo or valve stem seals then. just flinging ideas to help ya' think:
-rings on 4 didn't seat as well as the others
-there's enough residue left in the intake manifold to make it to 4 and smoke
-something keeps messing up a valve seal
-you've got a weird, almost unheard of crack in the head
This is true. My thought was that if something had caused #4 to break in incorrectly it would also show in the compression rings.
Not for the oil rings at least. If they fail, it coats the comp rings in oil all the time and you show good compression, like driving around doing a wet compression test all the time. The motor I built years back where I literally reused the old rings, it had 140 or so compression, but burned a quart every 200 miles or something crazy like that.