ALL J Code Manifolds Aluminum?

[maynardogle]

I just got the J code manifold I bought off ebay and was stunned to discover that it is cast aluminum. Are they all that way? Also surprised to find it is single plane. Anybody know if the single vs dual plane is preferable?

 

[tRustyK5]

All are aluminum as far as I know. Single plane flows a bit more air, but the dual plane is decent too.

Rene

 

[afroman006]

I second all 6.2 intakes are aluminum. I've never seen a C code, but I've had plenty of J codes.

The civilian single planes are very sought after because they flow more and are kinda hard to find. Intakes off hummers are single plane, but they arent tall enough for a civi air cleaner to clear the valve covers and the stud holes are 90 degrees off from normal. I think I am going to put a hummer intake on my motor whenever I build the snorkel for it, since I am going to have to make the air pot anyway.