Allstate Carburetor is providing the Holley Double Pumper 4150 Specs. ACFI is happy to provide the specs many of you have asked for all compiled into 1 place. All of the parts listed below are available on our website.

To locate and identify your Holley carburetor the number is located stamped into the front of the choke tower and will either start with the letter R followed by 4 or 5 digits. For example R-4776, or R-4776-1. The other way you may find the number is the word List followed by 4 or 5 digits. For example List 4053, or List 4777-4.

Either way the id numbers are stamped into the choke tower. All of these parts are available on our website as well as more Holley carburetor tuning parts.The carbs here are 4150 mechanical secondary Carb numbers.