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For all the testing with the factory iron heads, we used the stock, nonadjustable stamped-steel 1.7:1 rocker arms. The AFR heads are set up for a conventional stud-mounted adjustable valvetrain, so we enlisted a set of Crane's Widebody Gold series aluminum rocker arms. With this combination, we were able to reuse the same stock-length pushrods with the hydraulic roller camshaft. When we swapped in the Crane solid-roller cam, we needed to substitute 0.100-inch longer pushrods to maintain proper rocker-arm geometry.