I guess I must have run something different in my SBC as I have broken stock rocker arms.
45+ years ago, Engle (238) solid roller cam in SBC. Broke Stock rockers. The M/T rockers worked perfectly. The cam used dual valve spring and a rev kit. Don't remember what spring pressure was, but back then was a cast core, tight lash cam. Yes, it was for me street-able. It was driven from Phila PA to Nashville Tenn.
Stan
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