Valve springs with larger diameters require retainers to handle the higher pressures developed by the springs. COMP Cams steel retainers are precision machined from 4140 chromemoly steel and finished in black oxide. These precision retainers are specifically designed for positive location when combined with COMP Cams high-quality valve springs. For superior strength and ultimate stability, both 7° and 10° retainers and valve locks are available. Refer to the spring application chart on pages 293-303 for correct retainer part numbers for each COMP Cams valve spring. PartNumber : cca746-1 Description : Super Lock Valve Spring Retainers; Single Piece Title : 746-1 Steel Retainers, 1.550" Triple California Proposition 65 : WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov Compatible Lock : 638-1 Diameter 1 : 1.5 Diameter 2 : 1.12 Diameter 3 : 0.83 Diameter 4 : 0.64 Lock Angle : 10 Retainer Material : 4140 Chromemoly Steel Valve Spring Diameter : 1.500-1.550 Valve Stem Size : All Diameter 2 : 1.120" Diameter 1 : 1.500" Angle : 10° Stem Size : All Diameter 4 : .640" Diameter 3 : .830" Spring Diameter : 1.500"-1.550" Engine Components::Valve Springs, Retainers