Setting the Stage
The pushrods will be from Manton, while the valve springs will be Isky parts measuring 150 lbs of seat pressure and 420 pounds at full open. The rockers are from TA Performance, and are manufactured by T&D exclusively for TA. They are a stock replacement setup with 1.7:1 ratio (the max ratio allowed for the Challenge) on the intake side, and 1.65:1 rocker ratio on the exhausts.
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