SET OF CROW CAMS VALVE SPRING RETAINERS TO SUIT HOLDEN 253 304 308 4.2L 5.0L V8This Crow Cams performance retainer set has been machined to exacting specifications so proper fit and guide clearance is achieved. These retainers are made from "thru hardened" 4140 chrome moly material and have been machined to give an extra 0. 030 clearance to the valve stem seal. They're engineered to work in conjunction with stock valve train components and several other beehive type valve springs. Contents: 16 X Crow Cams valve spring retainer