The Iwis timing chain is the finest chain on the market. This single roller chain will work with factory and aftermarket single roller gear sets and is the perfect upgrade for the LS2 chain. This 3 Bolt 4 Pole timing chain gear is used when converting from a 1 bolt camshaft to 3 bolt camshaft. Stock replacement lower timing chain gear. Fits all LS engines except LS7 and LS9. These high-quality ARP cam bolts have increased preload clamping force to ensure positive timing gear register. Their increased material strength overcomes valvetrain harmonics and stress. LS2 style Timing Chain Dampener helps dampen chain whip and extend chain life. Will not fit LS1 and LS6 blocks