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I am also using ARP main studs in my motor and having 0 issues. Once I torqued down the mains I spun the crank by hand and it would spin for days. Didn't line hone it, either. Just measured everything and went with a std bearing. Then I put the rods and pistons in and could still spin easily by hand. I did have the crank cleaned, polished, and balanced.
Thats strange did u torq to 80ish lbs?