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[AZ200cc]

Originally Posted by TurboT

Wow.. that was some write up on 'stretch' bolts. We have an engineer amongst us! I always knew of them as 'torque to yield' myself.

I have 14 years in an engine shop. I've pressure tested and surfaced so many of those Mazda heads I lost count. If the problem was a cracked head, or head gasket problem, the engine would be smoking like crazy due to the antifreeze or water burning off in the cylinders, or running like sh-- since the compression would be seeping out of side where the gasket was split.

If none of those are apparent I would expect it's a cooling system problem like you're investigating. This is of course not my specialty as I was always working on the internal components.

LOL no we have a guy who can google for some person who has already typed it up and save myself an afternoon

You'll get it Kato, You're a sharp knife