Reply to "Identify rocker arm"

panterrorMy 74 GTS

The cup position on a BBC rocker is typically in a different position than a 351c due to the difference in deck height and pedestal/stud position between the two engines. The optimal pushrod geometry can differ accordingly. The change in the effective rocker arm ratio is probably subtle through most of the travel but at high lifts can become more of a factor. If you have low clearance, it can contribute to guide plate bind or interference between the pushrod and rocker body or possibly clearance between the pushrod and the head. Biggest issue is probably whether or not the pushrod end points significantly off center in the Rocker cup. If so, at extremes it becomes easier to spit a pushrod.

Best,
K

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