I picked up a Autolite 4100 1.12 to run on my 289. They rate these at 600 cfm. but most people say they dont flow nearly that much, will this be too much carb for my stock 289?

 

its probably on the upper end.

you may be able to get it jetted down to suit

i ran a 780 DP Holley on a 289. even after rejetting it ran like a pig down low and used every drop i could give it once the revs came up. the compromise worked ok but it was very thirsty. my current 302 runs rings around it for power on a 650 Holley.

 

like aussie said u will have to play with the jets . The 750 on my 289 was too much, but the 600 on it now needs to be jetted up. So i'm going to buy a jet kit from jegs which comes with every jet form 66 to 99 and cost 39.99.

 

The most common 4100 was the 1.12 venturi 600 CFM, and the much rarer 1.08" 480 CFM, are the ones you will come across. The large 600 CFM (1.12) was factory installed on Galaxies and T-Birds with 352, 390 and 428 engines. The small 1.08 was used on "A" and "D" code 289's and 1966 only Galaxie and T-Bird's with 390 and 428 applications. (The big blocks used the small carburetor for emissions reasons.) The "K" code 289 HiPro was fed by unique 1.12 600 CFM manual choke performance calibrated 4100. For a normal to even high performance 289 to function the best it must have a carburetor with around 480 CFM, and until now that meant the 1.08 Autolite. With the smaller size the driveability is flawless, i.e. no hesitation or flat spots and the fuel economy (with a 3.00 to 1 rear end) can exceed 20 miles per gallon. Add to that, the 1/4 mile performance is actually faster than the 600 CFM version. But, good luck in finding a 1.08.

 

hey soaring u got any part numbers on the 1.08 carbs i beileve i got my original laying around here somewhere? my car is an original "A" code i got it is all just disassembled

 

No Sterphen, I don't. But if you have a 108, then that is the carb you ought to be using.

 

my two mixture screws are broken off i gotta get that taken care of[:@]

 

Get a 500 CFM Edelbrock.