vintage racer and Italian car guru (He trained all the factory Bertone trained mechanics in the US in 1983), Peter Krause told me to always use Castrol GTX 20W-50 in x-1/9's.
Few oils have high zinc content any more. RotillaT was one of the last but it has changed also. The first 2 links offer high zinc content retro oils I have used for flat tappet cams. The third I believe does also but havent used any but have been to a semenar by Brad about his oil.
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