Guide Plate kit: Pontiac V8 58-79Brand new set of 8 x 3 8" Pontiac V8 Head guide plates for the Pontiac V8. C. A. T Chrome molly steel guide plates are manufactured from cool rolled 5140 chrom moly steel plate. This is a set as needed for one engine 350,400, 455. These hardened steel guideplates keep your pushrods in line with your lifter cups and rocker arms, and prevent deflecting, or walking sideways. The guideplates are hardened to prevent them from wearing prematurely