Im at a LOSS on this,
To me, it can not fit....in my stupid realm of sanity and reasoning.
That being said, any time I say: "It'll never happen" OR "It cant happen" is when...quite simply..it happens!
I just thought the dimensions for a 265/283/327 manifold are much narrower than a MOPAR 483 OR 426, perhaps a 361.
Gee, to me the design of the Chevy is narrow (manifold) and Mopars are like Pontiacs, WIDE.
But, I'm ALWAYS wrong...
So, here goes:
-Chevy small block: (Chevrolet SB) 265, 283, 302, 307, 327, 350, 400 Pitch: 4.40” Port layout: 00 00
-MOPAR: B/RB : (Chrysler B/RB) 350, 361, 383, 413, 426, 440 Pitch: 4.80” Port layout: 00 00
So in conclusion:
1. PORT Layouts are same
2. PITCH error is differential between Chevy 4.40" AND MOPAR 4.80"
VERY CLOSE
(The bore pitch (the center-to-center distance between adjacent cylinders in the same bank) must be similar. Gross differences will cause a fatal mis-alignment on three of the four ports in each bank)