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Gene1949 · 02-24-2026, 08:13 PM

I've been using Castrol GTX 20-50 for 25 years. Stock cam and Johnson lifters.
I don't think a stock flatty has enough valve spring pressure to warrant the expense of the Rodney Racer oils.

02-24-2026, 08:13 PM	#7
Gene1949 Senior Member Join Date: Jun 2016 Location: Pahrump, NV Posts: 513	Re: oil I've been using Castrol GTX 20-50 for 25 years. Stock cam and Johnson lifters. I don't think a stock flatty has enough valve spring pressure to warrant the expense of the Rodney Racer oils.