Is that bad crankshaft bearing fit? My guess is shortly after you do your good work he's going to have the same problem. It looks like the piston and ring sets (1st tme pistons good fit, assumed same for new rings) were chattering on the compression exhaust stroke.
~ Cosmo
1949 Chevy Half Ton
Rocinante, like Don Quixote, he is awkward, past his prime, and engaged in a task beyond his capacities.
"...my good horse Rocinante, mine eternal and inseparable companion in all my journeys and courses." ...Don Quixote, Cervantes
"If you come to a fork in the road, take it."...Yogi Berra
"Rudeness is the weak man's imitation of strength." ...Eric Hoffer
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