Product Description Specifications With a pre-stretched, heat-treated, double roller chain, billet gears, an infinitely adjustable cam gear and 3 key crank gear, this adjustable timing set for SBC/Olds Rocket w/ raised cam location is ideal for street and race. Category: Engine Components>Timing Chains Core: N LTL: N MPN: 3146KT Proposition 65: Y Special Order: Y