Never broken in all of C5-R racing and durability testing, this easy replacement utilizes production sprockets (not included). This is the exact timing chain used on the Corvette Racing C5-R, C6.R and C7.R race cars from 1997-present in the ALMS and now United Sportscar series. Also such endurance races as the 24 Hours of Le Mans and 24 Hours of Daytona. The C5-R race chain gets proprietary features over the standard IWIS aftermarket LS chain which includes “fine blanked plates” and a proprietary pin coating. This is the only chain you’ll ever need, and since it fits over production sprockets its a direct replacement with no worries of clearance to your oil pump