Yeah, their conclusion was that the thicker 20W-50 aided ring seal in that engine.
I was a bit surprised that it picked up power vs the thinner oil, but there it was...
Whether there was an issue with that engine's ring seal wasn't analyzed. Me too, I just wondered if that engine which was quoted to have "a ton of laps on" (Dyno), would be equally as worn when compared to a used street / strip or a drag race engine that's made 100+ passes 
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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