COMP Cams 7869-16 High Energy 5/16" Diameter 8.684" Length Pushrod for Pontiac 326-421, (Set of 16) 5/16 inch diameter; 8.684 inch length High Energy Pushrod for Pontiac 326-421 Best choice when building street rods, RVs or daily drivers Meet or exceed all OE pushrod specifications Mate perfectly with High Energy and Magnum Rockers