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Is a 750 holley to big for my 440? It's a vacuum secondary. The motor is stock. Inoticed that it always seems the plugs are little on the rich side
 

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no a 750 isnt to big. You need to jet it down if the motor is running rich.
 

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well you have to take the fuel bowls off to get to the front and rear jets. It will be easiest for you to take the carb off to do this. Also try checking the float level. To do that there will be 2 brass plugs on the passenger side of the carb. Some fuel may come out so put a rag or a towel to catch the fuel. Have someone or you can do it by yourself start the truck and let it idle. There is a big screw on top of the fuel bowl you can turn to adjust the float level. The fuel should just barely drip out of the bowl or near the edge to run properly. For high performance situations you want more fuel in bowl.
 

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also to much fuel in the bowl will make a rich running motor and the motor will flood alot.
 

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750 is perfect size for 440. Back in the 60's when they used Carter AFB's on Chrysler engines the 440's got 750 cfm carbs stock. Later on they got 850 cfm Thermoquads. Like the other guys said, your carb is running too rich.
 
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