Overview Reviews Product Description Valve Spring - Dual Spring - 640 lb/in Spring Rate - 1.125 in Coil Bind - 1.660 in OD - Set of 16 Product Videos Product Reviews Write a Review Write a Review × COMP Cams 1.660in Valve Springs Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *