Is anyone running chevron Delo in the Older Gas hotrod/classic vehicles that have flat tappet cams for the good higher zinc/phospahate content?

Chevron still shows a PDS (product data sheet) on their web site that shows the zinc/phosphorus content of .13/.12.
I called chevron tech guy and he confirmed the zinc content (By the way chevron discontinued the older Delo multigrade the pre Delo LE oil)

Unlike Shell does not show the zinc/phosphorus etc numbers of Rotela

Anyway I have a older chevy sm block performace built motor with a elgin comp cam flat tappet etc.

I am debating running my regular valveline oil and ZPPDplus oil additive http://zddplus.com/. Or just running delo oil for higher zinc/phosphorus(zddp) content

Ive been doing quite abit of oil research and zddp additives like Lucas zppd additive, Zddpplus, zddpmax etc and also running diesel truck oil like delo or rotela

Edited September 22, 20168 yr by GSP7

A few people on the Volvo forums are using Rotella in the older (1982-1998) models because of the zinc content.

I have ran it in my motorcycle in the past with no ill effects.

I ran 15w-40 in my 1983 Goldwing for years no problems.