Sorry it's taken so long to get back to yall. Let me first thank those of you who responded. George, thanks for the info on Corn cob media! and Dragsix, thanks for the Remflex suggestion. Bill i'm still trying to figure out how to get you my email address.
so, removed the manifolds and found neither was cracked or damaged so don't think i need the NOS that is impossible to find anyhow. However, the heat direction plate is frozen partially open. anyone know how to get it unfrozen? doesn't look like someone did it on purpose as was suggested in another post on this sight.
If i read and understood correctly, some have indicated that that condition would be ok and should operate satisfactorily. however, i'm going to exhaust all possibilities to try and find a manifold that has an operating heat flapper.
thanks again for all the great input!!
Blessings,
Oldtruckspapa
