87-Octane 460
All '68-'72 429/460 heads have screw-in rocker studs, but except for rare '70-'71 429 SCJ and early 429 CJ engines built before November 1, 1969, the valvetrain still isn't adjustable. To obtain adjustment, replace the bottleneck rocker stud (right) with a nonpositive-stop stud. Erson's big-block Chevy units work (left). View Related Article
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