Thank you so much all.
My intake manifold is 3835590 with 1/2" NPT vacuum fitting. The wiper, the hydrovac, and 2-speed switch, are served from another fitting on the firewall. The manifold fitting also connects to a pvc. This is good. The exhaust manifold is 3835587. I have two of these. One has a deteriorated interface with the intake manifold at the heat riser which I can't seem to make good. On the other one the pin that holds the bimetal spring to rotate the heat riser flap has rusted away.
Is there any way to replace the pin that holds the bimetal spring?
Matt:
The shipping worker at rpmclassic dropped and broke the beautiful pair that I bought on eBay and he just took this mysterious pair off the shelf nearby and sent them. He didn't bother to tell the people in charge. The company will take them back and are trying to find another correct pair like the one I bought, but aren’t having much luck.
DaveV:
Do your 62 manifolds have a ½” NPT opening in the center of the intake box? Is the gasket connection between the manifolds good? And are the port faces where they mate with the head all in a plane so they seal well at the head? Could you send me some pictures like the ones they put on eBay?
Clarke