I've been running Langdon's dual Carter/Weber/Offenhauser/Fenton header setup with exhaust heat on my 235 for the past 6000 miles. The initial setup required some massaging of the intake and also some minimal trimming on Tom's heat plate to give me full throttle movement.
The C/W and H/W initial synchronizing is made easy by fabricating a "cap" that allows you to use a Uni-Syn on the irregularily shaped carb tops. Granted, it takes a bit of ingenuity, some scrap sheet metal, and duct sealer, but once you get the carbs in sync and your linkage operating smoothly, the setup is troublefree. I check mine periodically and they stay in sync. I've also noted that using a fuel pressure regulator set at 3.5 psi will insure that you don't develop excessive fuel pressures. This also works on the Rochester carbs. Should have some pics of the "caps" in my album.
The exhaust cooling works....although Tom recommends the water heat. The Offy intake requires sealing of the two core plugs in the understide for water heat, and requires some creative plumbing. I've found that the exhaust heat is easier to install, quicker to heat, eliminates any chance of coolant loss, and is a cleaner installation.
Granted, a dual setup is going to require more tweaking than just slapping on a 4 bbl, but the esthetics of a dual carb setup make it a viable option.
Dave
