Difference in 318 and 340 exhaust manifolds?

[EvilScamp]

I have a set of what i believe to be 340 exhaust manifolds but i'm not positive.
How do i tell for sure? Casting numbers? I think they are off of a 69 340.

 

[66340SEDAN]

Post pictures or casting numbers, we will tell ya

 

[EvilScamp]

Post pictures or casting numbers, we will tell ya

2951123 is the casting number.

 

[cosworth]

Im showing that to be a left side 318 manifold.

 

[d5667]

70-71 318

 

[EvilScamp]

What would the number be for a 340?

 

[AdamR]

What would the number be for a 340?

It depends on the year.

 

[sireland67]

Here you go on casting #'s

http://www.mymopar.com/extcastnumb.htm