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  5. Holley 1904 Identification
When you can't find the carburetor number on the Holley 1904, it may come down to measuring the accelerator pump diaphragm to determine which carburetor kit to use.

Watch this video on how to measure the pump.

holley 1904 Look for your carburetor number on the pad just left of the float bowl. Example: cdte 9510 A. In this case cdte is what you are looking for. Add the A as in cdte-a. Some will have the LIST number, may a say LIST 1911 1 This would make it LIST 1911-1
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