These Steel Pontiac Valve Covers with Breather Caps Grommets, and T-Bar Hold Down Bolts was left over after restoring my 1967 GTO. They’re about 3” tall and I believe they will fit Pontiac 326, 389, 400, 421, 428, and 455 engines. (7.5L,7.0L, 6.9L, 6.6L, 6.4L, 5.7L, 5.3L, 5.2L, 4.9L, 4.7L, 4.3L, 3.2L). If you’re reading this ad the item is still for sale so please don’t ask if it’s still available.