The W-1 utilized a main venturi of 1 1/4 inch. The later 235 CID engines utilized a main venturi of 1 5/16 inch.
1/16 inch difference may not seem like a lot; but the total airflow difference is about 15 percent more (when you do the math, remember to subtract out the area on the boosters).
Perhaps my original post in this thread was hasty, and did not offer sufficient depth. The W-1 carb will work on the 235 (and work well at low and moderate loads). However, the engine cannot perform to its potential under full load wide-open throttle with the smaller carburetor.
And Dave, we don't disagree, we just needed to define the terms of discussion more accurately. My fault for the initial hasty post.
Jon.
