2 things. "1" why did you switch to synthetic oil? That engine was never designed with the idea of using THAT oil. Sorry but the whole synthetic oil debate bothers me. In my shop, everyone seems to think that switching over will solve every problem and cure cancer and make them rich. All by switching oils. Sorry. I feel better now. I'm trusting that you did your homework on the matter. "2" seems/sounds to me like a headgaset problem. The gaskets will leak between the cylinder and pushrod hole. This may not show up on your leakdown test, but that is better that a compression test. Try your leakdown again with the engine hot, valve covers removed and pushrods off the rockers. This will allow you to test with the pistons at bdc, which should also tell you something about your cylinder walls. I think this may actually be 3 things. Hope this helps. Tim
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