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They may not look sexy, but the stock 1.5:1 stamped-steel rocker armsare an engineering marvel and are fully capable of living with our hotcam and stiffer springs. The same goes for the stock 9.984-inch long,5/16-diameter pushrods. Despite the hefty head milling, the stockadjusters can take up the slack without introducing geometry problems.If both the block (iron only) and head are milled, shorter custompushrods would likely be required. We set the valve lash at .010(I)/.020 (E) cold with iron or aluminum blocks and check it every monthor so.