The slant-6 was offered with manual choke in truck applications. It's not just a bracket attached to an ordinary automatic-choke carburetor. The choke lever is
much longer than the automatic choke lever (to give good control over choke opening via a long throw from full closed to full open), underslung rather than overslung (so there's room for the lever to swing without hitting the air cleaner), and it's a coaxial spring-staged setup that lets the choke open partway just due to airflow past the plate even if the choke lever is in the full-choke position. Some manual-choke carbs also have a spring-loaded poppet valve on the choke plate itself to admit extra air even if the choke plate is fully closed. And the fast-idle cam is smoothly curved rather than stepped, so that it doesn't block the choke from closing when the driver grabs the choke knob and pulls. I'll try to get some pics the next time some of my manual-choke carbs floats to the top of the pile!
I agree the aftermarket kits are more "manual joke" than "manual choke".
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also is the best way to adjust a mixture needle/jet for best economy/running to first get the warmed up car to curb idle(choke and fast idle off) and then slowly turn the mixture screw in until it begins to stall or stumble and then back out the screw1/4 turn? thanks
Carburetor operation and repair manuals are posted
here for free download, together with detailed info on how best to set the idle mixture.
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