Air gap manifolds in cold weather

scrappydoo said

Thanks for the replies.

I going with magnum heads, it doesn't look like there are any manifolds with heat crossover.

The Mopar M1 dual plane looks like it has something for water heat crossover but I can't tell for sure.
Does anyone know?

edit:
I've answered my own question, summit have a 360deg. view of the manifold and you can see that it uses coolant for the manifold heating.
Thanks.

Click to expand...

All manifolds (even an Air-gap) have the water coolant passage. That's not for heating the manifold. It's for connecting the water coolant passages on the heads and providing an outlet to the radiator. Magnum heads have no exhaust heat crossover like LA heads so it doesn't matter what manifold you use although a manifold that's not an Air-gap style might be slightly better cause the oil being splashed on the bottom side of the plenum will heat it some.