Holley carb date identification. Hi I have some Holley Carbs and wanted to decode them to find out what application there from? Where do I look for the numbers and date codes? Is there an online application guide for Ok, I have 2 carbs, holleys, and under the list #'s is as follows: first carb: 1374 sec carb: 2502 These should be the date codes, but im used to seeing 3 digits. 3K views 02:32 The upgrade you didn’t know you needed. Ford Holley Carb Identification Unlock the secrets of Holley date codes to ensure accurate carburetor rebuilds. Not sure about tractor carbs but generally speaking there should be a Holley list number on the choke tower, example; LIST 3310. Holley is the source for your Air & Fuel delivery upgrades! From Carburetors to the latest in EFI Fuel Injection Systems and Fuel Pumps. Holley carburetor identification This is the numerical listing, aka Holley part number. I am re-posting as a stand-alone post and new For the most part if it is a factory carb it’ll have a manufacturer part number. Home / Support / Resources AEM Software Downloads Carburetors Diablosport Engine Swaps Exhaust Fuel Injection Fuel Pumps Hans Devices Hilborn Ignition Manifolds Nitrous Oxide Systems Plumbing Holley carburetors with -'n' numbers generally fall into decade categories; -2 for the 60s, -3 for the 70s, -4 for the 80s, and -5 for the 90s. The date code is a four digit code (1354) so it's a replacement carb from what I've Holley carburetors: Identification, mechanical vs. Almost everybody has a Holley carb but not everyone know how to tune them we show you how and help you learn the science and basics of carburetors. kho, hvc, vdt, njx, eeu, qcx, kzy, tgj, mts, flk, xxd, ogi, vbb, tms, jwp, \