Super strong, lightweight, and black oxide treated. Will not wear out and are impossible to break. Engineered to withstand the rigors of competition Hi-Revving engines. Machined from Chromoly steel and then heat-treated to Rockwell specs to match the valve ends.

Chromoly Valve Spring Retainers can be used on both dual and single valve springs. They finish out a cam system and are ideal for street, off-road, or drag strip use. Can be installed on all 1961 & later 40hp, 13, 15, and 1600 based engines.