Product Description Specifications Constructed from one piece of seamless .105" wall chromemoly steel then black oxide coated and heat-treated, these 7.400" long Hi-Tech 5/16" diameter pushrods are 17% stiffer than .080" wall Hi-Tech pushrods. Category: Engine Components>Push Rods Core: N LTL: N MPN: 8406-16 Proposition 65: Y Special Order: Y