I'm lost in the fog. CFM ratings and jet sizes are like apples and oranges.orrbmx said:Is it possible to jet down an Edelbrock 750(1407) to Edelbrock 600(1405) specs? I have chevy 350 that the 750 would be too much for, and don't want to have to buy a new carb. Any help would be great.
1403 500 .086" .095" .065" x .052" orange (5") .0935" 7/16" 1-1/4" middle hole .028" 1-3/16" 1-9/16" 1-7/16" 1-11/16"techinspector1 said:I don't know who started all this "jetting down" business.
Every time I see this statement, it gives me pause, wondering what area of science it came from. According to everything I've learned over the past 50 years, the throttle bore size and venturi size dictate the CFM of a carburetor, not the jetting. The jetting you choose only changes the relationship between the amount of air compared to the amount of fuel that is being pushed into the ports by atmospheric pressure with the intake valve open. A 650 CFM carb is a 650 CFM carb, no matter how you change the ratio of air to fuel by changing the jets.