Thermoquad question
Looking for input about a thermoquad carb. Good carb? etc??
First, I’ll talk about the bad. Jets and rods are not sold in kits anymore and the ones found on E-bay are expensive as heck. The Carbshop has parts for these carbs. Tuning them is a learning curve. You’ll need to find one that has good throttle shafts, as in not leaking air. Cracked center sections can be JB welded but new ones are about at a zero. Remember there are 2 screws in the primary side of the air horn.
The weird…. Air cleaner bases might not clear so easy. This is due to the top of the aluminum part of the carb having a weird bulge not found elsewhere. The solution is a much thicker carb gasket.
Also, use a thick crab to intake gasket. The rebuild kits normally have this OE style of gasket. The thin paper ones are not helpful and allow to much heat to the carb which will boil the fuel and potentially warp the plastic of the carpet.
The best part
This carbs are generally inexpensive and perform reallllly well. They come in two sizes. For your 273, find a small primary carb. (1.38) The smaller primary will help with air velocity and atomizing the fuel.
Contact GTXjohn for an electric choke model. That ought to simplify installation and speed up the process of getting the car running and driving.
If you get one elsewhere, the less vacuum ports on the carb the better. IE, earlier the year the better.
Take note that the race versions (rarely seen) and the first OE years are entered differently and use press in, not screw in jets. This can be a problem tuning wise.
