This OEM exhaust manifold heat riser control valve is in very good condition. This fits 1956-1967 Cadillac RWD vehicles. This is cosmetically correct for 56-64, but according to Cadillac Parts book, this is interchangeable to the 56-67 Cadillacs, as it states when #3631814 is exhausted to use #3632576, and we have personally installed 3632576 heat risers on 56-64 Cadillacs and vice-versa with no problems, just cosmetic difference. The heat riser spring and valve move smoothly, not stuck or binding and casting is intact. Spring tension is good. Gasket surfaces have very light pitting, but nothing that the gasket won't take care of. These are becoming impossible to find. Please look at all the pics as they are a part of the description. This was removed from a 1965 Cadillac Superior Fleetwood Hearse , but may fit other vehicles. Fitment is verified by Cadillac Master Parts List 3.647/0.4490, #3631814 (supersedes part #3632576) please do your own research as we do not offer refunds if it does not fit your vehicle.