Quote: ...was the 337 OOTB or ported? As I mentioned in another post the 'as delivered' 337 ports are only about 1/2 way between a 906 and a real Maxie, the 337 does have excellent taper from the plenum as delived though.
I get the blame for the '337. I matched it to the gaskets Mopar sent with it and it was a bit of work. I had planned to match it to my heads (Stg VI) but it turned out that my heads were much closer to MW than I thought and it was just easier to match everything to the gaskets.
I also shortened a Dart 2" 4150-4500 adapter and built-in about 5 degrees of carburetor angle so it would fit my car better. Before the shortening process the plenum match was better than could be expected but afterward much blending was needed. The modified adapter is mounted to the manifold with 4 1/4" socket head screws. I don't think I've ever run a MP casting as out of the box.
