Odd’s are that since that motor had only 4K on it and no doubt was well maintained during those 4000 or so miles I would have to say it’s just a case of number 7 not braking in as well as all the others when the motor was run for those first critical 20 minutes.
With all that cast iron metal grit in the motor it should all come down so everything can be inspected and the oil galleys flush out and the crank oil passages need to be brushed and flushed out.
Hopefully your piston skirts are ok as well as the cylinder walls.
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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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