Thanks again. Yes i asked my engine builder, He suggested modern 10/30 fully synthetic because of the crank tolerances and the fact that it has a roller cam. Afterwards though, just in conversation with a very good friend and very knowledgable racer, when I mentioned this he said that he would never use modern fully synthetic in an old motor, stick with Kendall 20/40 or similar. Thats the reason for my question. And, as this post proves, there are several conflicting answers.
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