Race Ready - Hi-Tech Roller Race Timing Sets are ready to handle the high load race conditions. Plus, the chains are available separately! Sbc Timing Chain COMP Cams 3161 - Timing Gear Set | - Performance Auto Parts 351c Camshaft The camshaft gear is constructed from cast iron, while the crankshaft sprocket is built from induction hardened billet steel. See 3033 for replacement chain Made in USA The middle keyway installs the camshaft with zero degrees of advance, while the other two allow for 4 degrees advance or retard. The Best Chain - Pre-stretched from the factory then heat-treated, this true double roller chain is designed to handle street and race applications without loosening up. Tight Tolerances - Hi-Tech Roller Race Timing Sets are all dynamically balanced before they get to our customers. This adjustability is a must for anyone who degrees in their camshafts. Find the right Comp Cams Hi-Tech Timing Set for your vehicle at O'Reilly Auto Parts. Place your order online and pick it up at your local store for free. ... Comp Cams Hi-Tech Timing Set - 3121 Part # 3121 Line: COM ... Engine Make/Size: Ford 351C, 351M Premium Quality Gears - COMP Cams Hi-Tech Roller Race Timing Sets are built using high end materials.