383 magnum versus 383 big block

dukeboy_318 said
383, depending on the head castings, should have a 2.08 and at minimum a 1.74 exhaust, except for the early heads which were a 1.60 exhaust.

I went back in and changed the valve sizes. That made a difference. The 383 comes out on top now. It's still a very inaccurate comparison on my part.