How do your plugs look?
If excessive oil was getting into the chamber then that would be seen on the plugs, but on top of that oil getting in there will lower the fuels Octane rating possibly by a lot.
If that's the case then the motor could be detonating at a given throttle opening and detonation will unseat the rings making for blowby and abnormal crankcase pressure.
I am not getting the warm and fuzzy's from the capabilities of your builder I must say at this point!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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