I have a 71 Challenger Conv. with a 318 engine 2 bbl carb and I was looking to upgrade it to a 4 bbl carb. I was looking online at different manifolds and there seems to be a variety of different products. Is it possible for you to recommend one and why it would be better(trying to learn). Thank you
I’ll assume when you mean ‘correct’, you mean from a performance aspect — there were no factory 318 4-Bbl cars in the early 1970s.
Later in the ‘70s and ’80s, there were 318 (LA wedge) factory 318-4 engines, but they ALL used 360 heads, which have larger ports. If you use a 340/360 manifold, there would be some port mismatch, which isn’t the end of the world, I’d not hesitate to bolt one on. Even and OEM iron casting.
Alternately, try to find a used aluminum 318 (or 66-up 273) manifold, they were made, back in the day, by both Edelbrock and Offenhauser.