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When building any engine from scratch, you'll need to check for the proper pushrod length. A last-minute oversight meant that we didn't have the right Comp Cams pushrod-length checker for the 351W, which uses longer pushrods than a 5.0L, but thankfully local machinist Scotty Guadagno of Scotty's Racing Technology (Spring Hill, Florida) loaned us the needed tool. Our measurements produced a 7.600-inch pushrod length, for which Comp Cams sent us a set of its Hi-Tech chrome-moly, heat-treated, 5/16-inch-diameter pushrods (PN 7959-16, $134.95). Comp also sells a number of pushrod-length checker tools.