Roll It Over
Pushrod length changes dramatically when converting an older block to hydraulic-roller lifters. Comp Cams' retrofit hydraulic-roller tappets use a 7.300-inch pushrod length while stock flat-tappet engines generally employ a 7.800-inch pushrod. OEM roller-cam engines spec a much shorter 7.200-inch pushrod. As you can see, it pays to pay attention to pushrod length.
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