How do i tell what size housing I have on my WH1C? Could it be a 14cm WG on there?

 

If you look inside of it, where it bolts to the manifold it will have the size cast in. I have heard some people say this isn't always true. But, the one I took off had 18 on the inside, and the one I put on had 12. I think some heavy duty engines had the 14cmWG.

HTH

 

If it came off a Dodge, it's a 12 cm.