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I do have full exhaust. 3 inch flowmasters exit out the rear. Buddy is having similar issues. Really the only common thing between engines are the stealth heads. I did notice that on those heads where the push rods go thru them there is just a hole for the pushrod they are not"open" like a cast iron head. Dont know that that makes any difference just an observation. Im going to change the oil noting the amount and do the leak down test. I did pull the breather and pcv valve they are extremely close to the baffle in the valve cover about 1/8 inch

1/8" is gonna be to close, especially when things are oil soaked. Could be a combo of things, including over filled. Any kind of aftermarker pan requires remarking your dip stick for the amount of oil you want to use. Don't believe the exhaust or pushrod holes are your problem.

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