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Joe Gibbs make a great oil also. ANY engine that runs a flat tappet cam (non roller) you need zinc or ZDDP (zinc dialkyl dithio phosphate) to keep the lifters and cam lobes from wearing out too fast.
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1970 T1 W/MassIVe 2913cc RAT/?EFI? w/direct fire (very soon) and 915 trans 
1962 SC 1776cc SP 944NA brakes, 993 wheels
VKG
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