Some early 4100 carburetor used Holley Jets. This chart is for the more common Motorcraft jets.
| CARB NUM | CFM | PRIMARY JET | SECONDARY JET | METERING ROD SIZE |
|---|---|---|---|---|
| C0AE-J | .052 | .063 | na | |
| C0AE-K | .053 | .061 | na | |
| C1AE-AG | .055 | na | na | |
| C1AE-AH | .054 | na | na | |
| C1AE-AK | .055 | na | na | |
| C1AE-AL | .054 | na | na | |
| C2AE-AG | 0.055 | na | na | |
| C2AE-AJ | 0.0612 | na | na | |
| C2AE-AK | 0.054 | na | na | |
| C2AE-AL | 0.055 | na | na | |
| C2AE-AN | 0.0612 | na | na | |
| C2AE-AR | 0.054 | na | na | |
| C2AE-AT | 0.055 | na | na | |
| C2AE-AU | 0.0612 | na | na | |
| C2AE-AV | 0.054 | na | na | |
| C2AE-AY | 0.055 | na | na | |
| C2AE-AZ | N/A | na | na | |
| C2AE-BA | 0.054 | na | na | |
| C2AF-T | .054 | na | na | |
| C2AF-U | .055 | na | na | |
| C2AF-Y | .054 | na | na | |
| C2AF-Z | .054 | na | na | |
| C2SF-A | .054 | na | na | |
| C2SF-B | .054 | na | na | |
| C3AF-AT | .054 | na | na | |
| C3AF-AU | 0.054 | na | na | |
| C3AF-AV | .054 | na | na | |
| C3AF-AY | 0.054 | na | na | |
| C3AF-BU | N/A | na | na | |
| C3AF-BV | N/A | na | na | |
| C3AF-BY | .054 | na | na | |
| C3AF-BZ | 0.054 | na | na | |
| C3AF-N | .056 | na | na | |
| C3AF-R | .056 | na | na | |
| C3AF-S | .056 | na | na | |
| C3AF-T | .056 | na | na | |
| C3OF-AB | 0.054 | na | na | |
| C3OF-AJ | 0.054 | na | na | |
| C3SF-B | 0.054 | na | na | |
| C4AF-DL | 0.05 | .067 | na | |
| C4AF-DU | 0.05 | 0.067 | na | |
| C4AF-DV | 0.048 | 0.057 | na | |
| C4AF-DY | 0.048 | 0.058 | na | |
| C4AF-DZ | 0.049 | 0.053 | na | |
| C4AF-EA | 0.048 | 0.055 | na | |
| C4AF-EF | 0.051 | 0.067 | na | |
| C4AF-EH | 0.057 | na | na | |
| C4AF-N | 0.05 | 0.056 | na | |
| C4AF-R | N/A | .058 | na | |
| C4GF-AA | 0.048 | 0.056 | na | |
| C4GF-AB | 0.048 | 0.046 | na | |
| C4GF-AE | 0.048 | 0.056 | na | |
| C4GF-AF | 0.046 | 0.058 | na | |
| C4GF-AZ | 0.048 | 0.056 | na | |
| C4GF-BA | 0.046 | 0.058 | na | |
| C4GF-E | 0.049 | 0.055 | na | |
| C4OF-AL | 0.051 | 0.07 | na | |
| C4OF-AT | 0.051 | 0.07 | na | |
| C4OF-BT | 0.051 | 0.07 | na | |
| C4OF-BU | 0.048 | 0.057 | na | |
| C4SF-B | 0.048 | 0.057 | na | |
| C4ZF-C | 0.045 | na | na | |
| C4ZF-G | 0.051 | na | na | |
| C4ZF-H | 0.051 | na | na | |
| C5AF-AA | 0.048 | 0.055 | na | |
| C5AF-AC | 0.049 | 0.060 | na | |
| C5AF-AD | 0.052 | 0.067 | na | |
| C5AF-AE | 0.05 | 0.067 | na | |
| C5AF-AK | 0.05 | 0.06 | na | |
| C5AF-AL | 0.048 | 0.055 | na | |
| C5AF-AN | .049 | .060 | na | |
| C5AF-AR | 0.052 | 0.067 | na | |
| C5AF-AS | 0.05 | 0.067 | na | |
| C5AF-AT | 0.05 | 0.067 | na | |
| C5AF-AU | 0.05 | 0.06 | na | |
| C5AF-AV | 0.048 | 0.055 | na | |
| C5AF-AZ | 0.049 | 0.06 | na | |
| C5AF-BA | 0.052 | 0.067 | na | |
| C5AF-E | 0.05 | 0.06 | na | |
| C5AF-F | 0.048 | 0.055 | na | |
| C5AF-H | 0.048 | 0.055 | na | |
| C5AF-J | 0.052 | 0.067 | na | |
| C5AF-K | 0.05 | 0.067 | na | |
| C5AF-Z | 0.05 | 0.06 | na | |
| C5OF-J | 0.052 | 0.068 | na | |
| C5OF-K | 0.05 | 0.069 | na | |
| C5OF-L | 0.052 | 0.068 | na | |
| C5OF-M | 0.05 | 0.069 | na | |
| C5OF-T | 0.05 | 0.069 | na | |
| C5OF-U | 0.05 | 0.069 | na | |
| C5SF-A | 0.048 | 0.061 | na | |
| C5SF-B | 0.048 | 0.061 | na | |
| C5ZF-C | .049 | .058 | na | |
| C5ZF-D | .048 | .058 | na | |
| C5ZF-E | .049 | .058 | na | |
| C5ZF-F | .048 | .058 | na | |
| C5ZF-J | .049 | .058 | na | |
| C5ZF-K | .048 | .058 | na | |
| C5ZF-L | .049 | .058 | na | |
| C5ZF-M | .048 | .058 | na | |
| C6AF-AB | .048 | .067 | na | |
| C6AF-AC | .047 | .067 | na | |
| C6AF-AF | .052 | .068 | na | |
| C6AF-AG | .051 | .068 | na | |
| C6AF-AJ | .056 | .056 | na | |
| C6AF-E | .049 | .067 | na | |
| C6AF-F | .048 | .067 | na | |
| C6AF-J | .052 | .068 | na | |
| C6AF-K | .051 | .068 | na | |
| C6AF-L | 0 | .048 | .055 | na |
| C6OF-D | .049 | .067 | na | |
| C6OF-E | .048 | .067 | na | |
| C6OF-H | .048 | .067 | na | |
| C6OF-J | .047 | .067 | na | |
| C6PF-H | .048 | .057 | na | |
| C6SF-A | 0.048 | 0.067 | na | |
| C6SF-C | 0.048 | 0.067 | na | |
| C6ZF-A | 0.049 | 0.058 | na | |
| C6ZF-B | 0.048 | 0.057 | na | |
| C6ZF-C | 0.052 | 0.068 | na | |
| C6ZF-D | 0.047 | 0.058 | na | |
| C6ZF-E | .046 | 0.058 | na | |
| C6ZF-F | 0.052 | 0.068 | na | |
| C7ZF-B | 0.051 | .069 | na | |
| C7ZF-C | 0.05 | .069 | na | |
| C8AF-AE | 0.051 | 0.071 | na | |
| LSA1-XB | .089 | .080 | .065 x .063 x .058 |
How Do I Know My Jets Are The Correct Size?
Watch your spark plugs. They should burn tan, or gray color. White indicates too lean and black indicates too rich. To get the correct color, change the jets by .002.