Stock Diameter Performance 1.514 Dual 10 Degree Valve Spring & Retainer Kit Need a complete Cam Kit? We made it easier. Just chose which Camshaft and Lifters or Cam and Lifter Set and add one of these Valve Spring, Retainer and Lock Kits. Each kit includes a set of Howards Cams performance Valve Springs, match Retainers and heat treated Valve Locks. These kits offer more combinations to suit your needs. Building a Mopar, but with performance single groove valves? Simple just change kits. Chevrolet big block, but with 11/32” valves instead of the stock 3/8”? Just use the correct kit.