Valve Spring - Single Beehive Spring - 332 lb/in Spring Rate - 1.220 in Coil Bind - 1.320 in OD - Set of 16 MPN - R2 SET OF 16. The single part number is GMP12625033, Used on 604 CT400 Crate engine. Also SP350,ZZ5,ZZ6,SP383,ZZ383 Vendor CHEVROLET PERFORMANCE Truck Freight-- NO