After posting, had some time to play with Google.
Carter stated that the 585s was used on Chevrolet 235 and 270 engines. In fact, the 270, as I had asked in the first post, is a GMC.
Did not find good engine specifications (HP, max RPM) on the military 235 (Chevrolet) or the 270 (GMC); but these carburetors are little more than a sealed version of the 574s (1946~1948 216 CID Chevrolet civilian version). Same venturi size (1 1/4), same vents, same jets (slightly different metering rod). The main difference (other than sealing) was Carter specified the fuel level in the bowl of the 585s to be 1/8 inch higher than in the civilian 574s.
When Carter offered the replacement YF carbs, the 1 1/4 venturi was specified for the 216, but the replacement for the 235 got a 1 5/16 venturi.
Wonder how the mid-1950's 235 would run with a 1946~1948 574s W-1 with a slightly higher fuel level?
Jon
