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Hey M139, thanks for the info on the zenith... I'll look into that as an option as well. I have also heard ofa "fuel miser" update kit on the original Holley's. What I'd really like to find is a carb with a mechanical accel pump and no vacuum crap on it.

Hi jason, yes, they are rich for a couple reasons, you sorta hit one on the head, which I'll get to last. First, the carbs are a very simple design to provide a generic and adequate fuel mix for full power at any rpm. Fuel consumption/economy wasn't an issue to the military in those days...

to jason 5... the holley found on 5T gassers is jetted heavy. There is no adjustment for lean/rich other than idle screw, which you can lean right down to a point it will not stay running, yet it will still be a rich mixture during working rpm's. I haven't seen a 5T gasser that didn't run rich...

Craig, the 6602's inherently run rich enough already,,, they don't need a 4-barrel to add more fuel to the mix.... We called them "brush burners" for a reason...... They not only had a habit of catching roadside brush on fire, but while I followed I watched an M127 semitrailer full of...

cracked or broken exhaust manifolds on the R6602's are common. The engines usually get shut down hot and the design of the casting isn't the strongest. I've replaced maybe a couple dozen of them in the mil.