I took the manifolds to a local shop.

They hot tanked the intake manifold and it is a LOT cleaner!

They got the heat riser to move freely...but that was a couple of weeks ago and it is much stiffer now. It still moves, but not as freely as it did when I brought it home. It is pretty dry here in New Mexico, so I doubt there is any new rust to speak of. Is there a lubricant I should use on it? I was thinking about a product I knew of a number of years ago...it was a spray that carried graphite. Would that be appropriate to apply to the heat riser shaft?

Suggestions?

Thanks!

Nick
1940 KC Model 1/2 Ton Pickup Project
(with '37-'39 Bed and what we think is a '42-'46 Frame)
Taos, New Mexico