Rear body separation under hard acceleration either plants the tires or unloads them entirely, and a fixed-valve shock can't adjust to split the difference. Calvert's HR Series shock puts a 9-way external dial on that control, letting the same shock dial in from comfortable street settings up to the higher resistance a drag launch demands.

Calvert Racing HR42123 HR Series Rear Shocks Features:

• Fits Chevy applications.
• Twin-tube design with a 9-way external adjustment dial.
• Heavy-duty 5/8 in. shaft.
• Higher resistance range than standard CR Series shocks for hard-launch drag applications.
• Includes required mounting hardware.
• Sold as a pair.