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If you're changing out pistons and rods I would at the very least run a higher viscosity oil.
Factory clearances are generally tighter than what most shops can do.
And again since you're swapping pistons & rods I'm assuming you'll be racing it more frequently than GM intended. Your main bearings will see that punishment. So i'd also go with higher zinc.
I ran Zrod oil in my last built motor. Also on my LT1, since I religiously beat on it during weekends.
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'18 1SS 1LE M6 NGM|| 11.5:1 Diamond Pistons || Callie's H-beams || Vengeance III Cam Kit || Built Heads || TSP LTs 1 7/8"(C-Coated) || MSD IM || DSX E85 || Rotofab || BMR Springs || 576/472 @7000rpm
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