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I can't get a LO206 Head Gasket to last
Repeated LO206 gasket failures are decided by whether the head face is still flat. Heat concentrates on the header side and that is where these heads go out of true. You cannot mill them in this class, so another gasket is wasted money once the surface has moved.
I need to choose between a replacement head and a complete new engine. A fresh head still sits in the same heat path, so I do not see it lasting unless that flange area is handled differently. Has the block deck been as much of a factor for anyone, or does a new head usually stop the cycle?
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Probably not enough torque or bad torque wrench? What r u torquing the head at?
Or your head is warped. They leave some room in the rules to deck the head.
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Before you spend money on a replacement head or a whole engine, coat the gasket face with a felt marker and lap it on lubricated paper in a crossing eight motion. That check comes first because a full wipe of the ink tells you the warp is small enough to save, and it rules out the expensive guess. Keep the paper lubricated so it cuts clean and look after a few passes for even contact.
The old as-cut finish rule is gone, so a slight machine cleanup that stays inside total head height is legal and that's usually enough to true a warped 206. If there is no height left and the face won't clean up, replace the head only. The block deck almost never moves the way the exhaust side of the head does, so a complete engine can wait.
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