Hi Rick!
You need to determine if the ACR is working. Two ways to do it,, first is to pull the head and look at it the second is to use a dial indicator through the plug hole set on top of the valve. Pretty pricey for that type of rig so I'd just pull the head to see, and if that is not the problem you can clean things up anyways and put on a new head gasket. I'm betting against a bad ACR and would look for other things.
How long does it hang up per revolution... an instant, a half second,,, a few seconds?
Try running a jumper cable from the negative post of the battery to a clean mounting bolt on the S/G.
We will figure this out!!
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