All reconditioned manifolds are cleaned, magnafluxed, shot peened, magnafluxed again, checked for flat gasket surfaces and machined as needed, and have new studs installed as needed. We do not weld up cracked manifolds for sale. Reconditioned manifolds are guaranteed to not be cracked at the time of delivery. New replacement left side manifolds are available (’68-’76 style, both Eldo and RWD versions). Note that most ’68-’72 Eldorados have a unique side-exit passenger’s side manifold, but most ’73-up Eldorados used the same passenger’s side manifold (down-exit) as the other cars. Please check the original manifold style on your car before ordering. Some passenger’s side manifolds have an EFE valve, and some don’t.