Re: Zinc & solid Lifters
Any of those weights are good like Sam said.
In my L-78/TH400/4:10 I've been using Valvolines' VR-1 20W-50 Racing Oil that carries a minimum .116 zinc level.I'm pretty sure all three of those weights do as well.
Their "Not Street Legal" Drag Racing oils carry .112 of zinc.
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