Most all the big truck GMC's have PVC's on them. don't know if they will work on Chev's or not. Most had valve in valve cover which was dented in or cut-down to clear hood or things? Some years of COE's in Chevy have this system or on Delivery's that had just chassis and front fenders when built, forward control they were called!


G.L. Grumpy's
Old Iron Ranch
Huntington, IN 46750


MM R tractor, Speedex
and Power King tractors