famdoc3 (1/20/2012)
what are the dimensions of the air cleaner? What are you guys using in your T'birds as a replacement?An air cleaner housing for the dual quad set-up on the ’55 – ’57 ‘Bird is a head scratcher for me. The clearance between the front Holley 4000 carb. and the hood forced the factory to install the carburetors backwards from how the single teapot was mounted on both the ’55 and ’56 ‘Birds and passenger cars, and the dual quad ’57 passenger cars!
The factory mounting of the dual carbs. backwards on the ’57 ‘Bird required different throttle linkage components, fuel lines, and even a different air cleaner housing (upper housing height and dome heights are different; and therefore the air filter element height is also different) than the ’57 dual quad passenger car set-up! Can you imagine the tooling cost to Ford for doing that?!?

A
Forum member has shared with me the cost of used and reproduction air cleaner assemblies for the ‘Bird and I’m uncomfortable paying anything close to those figures! I’m working on a
draft design that utilizes a 1/4 inch flat aluminum plate for an oval base piece, and a top piece that would be cnc machined from 1/2 inch aluminum plate. The top plate would be patterned after the '62 Ford 'M' Thunderbird 3x2 air cleaner top (oval perimeter shape) with two spun aluminum domes shaped like the ones on the ’57 air cleaner unit rising out of cut-outs in the top plate to accommodate the Holley 4000 carburetors. I am unsure how I’m going to secure the two domes to the top plate at this writing. Perhaps a beaded flange on the bottom of each dome that is TIG welded (four tacks each) to the underside of the top aluminum plate.
While this design will be termed 'aftermarket', it is intended to be functional, and complementary to the original Thunderbird cast aluminum valve covers. The sizing of this air cleaner housing is intended to fit the hood clearance of a '55 - '57 Thunderbird and to use the same oval air filter element used in a reproduction unit I was able to borrow from an acquaintance. The air filter element air intake surface would be visible as on the '62 390 and 406 3x2 engines.
NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York