Engine Pro 03-1006-16 American Chromoly 10 degree 1.4/1.07/.685 Steel RetainersCALL SHANON AT 507 445 3235 WITH ANY QUESTIONS. New valve springs with larger diameters require new retainers to handle the higher pressures developed by the springs. Engine Pro steel retainers are the solution. Precision machined from heat treated 4140 chromoly and finished in black oxide, these retainers are specifically designed for positive location when combined with appropriate valve springs. 1. 400" O. D. 1. 070" I. D. 10 Degree 11 32 Flat