Holley carb date codes

We will have this carb back in stock soon with date code 663. Call for estimated completion date. Out of stock. SKU: 24-3367 Category: Carburetors-Restored Tag: Holley. Description Additional information Description. Holley 3367 Restored 1966 Corvette carburetor List 3367 HOLLEY carburetor Date Code is 661 1966 June 1st week . This is original ...

This carburetor was made by Holley , The Holley Brothers Company was started in 1905 in Detroit Michigan then became the Holley Carburetor Co . It is a H4-4150 . This carburetor has a part number of R3259-1 S2MS-A LIST 3259-1 S2MS-A and used on 65-67 Cobra GT-350 . Check here for specific Muscle car Info.Most batteries have expiration date codes, indicated by stamps on either the battery itself or on the packaging. Expiration dates differ from the date of manufacture, so users must...Hey guys I'm looking for an original Carb for my 69 Z/28. This is model 4053 dz someone is selling on at e-bay however the date code is 281. I thought the dates went by year/month/week. Can anyone tell me where I can find the info on Holley date codes? Also I believe my car was made in August of 69 what date on the carb would be appropriate?Factory Refurbished Carburetors. Availability. Factory Refurbished carbs have undergone a thorough inspection. We are making them directly available to the public. This allows you to get a great deal on a like-new carburetor!Ford Carb Identification: Ford Motorcraft Autolite 740 1100 2100 2150 4100 4300 4350: Full Size View 1100 1101 1250 Parts Page Diagram: Full Size View 2100 2150 Parts Page 2100 Diagram 2100 Late Diagram 2150 Diagram: Full Size View 740 Parts Page Diagram: Full Size View 2700 7200 Parts Page Diagram: Full Size View ...Interior. 976 Mulsanne Blue. 979 Bridgehampton Blue. 982 Donnybrooke Green. 992 Laguna Gray. 975 Marlboro Maroon. 993 Corvette Bronze. 974 Monza Red.Carburetor Components. Fuel Pumps Regulators and Filters. Also in Air & Fuel Delivery. Air Cleaners. Air Scoops. Cold Air Intake. Fuel System Kits. Fuel Tanks and Fuel Cells. HydraMat.I have found two of them. One is list 3310 with the original 1965 Chevy part # 3878261-EH though the date code says it's a 1969 replacement for the '65 SS 396/375hp. The other one is list 3310-1 with no other codes. Both are 4150's, 780 cfm, down leg boosters, vacuum secondary's and have been unmolested. They have identical tuning and match ...

The "8" is 1968. The "E"= is the month of the year (A=Jan., B=Feb., C=Mar., D=Apr., E=May). So my date code would translate to May, 1968. Build date for my car is late May, 1968, making a very late year build. There is no knowledge or consistency in determining how soon the new carb could be installed or how long it might have sat on the shelf.identify these newer carburetors. The four digit date code is one. Holley went to Julian dates composed of four numbers: the first 3 digits are the day of the year, the fourth digit is the last digit of the year. For instance, a date code of 0311 would mean that it was built on the 31st day of the year (Jan - uary 31st) and the year is eitherHIGH PERFORMANCE CARBURETOR INSTALLATION AND ADJUSTMENT INSTRUCTIONS NOTE: ... Holley mechanical fuel pumps are recommended and will produce a 50% increase over 9 out of 10 stock factory pumps. Use of a Holley electric fuel pump at the rear of the car next to the fuel tank will help ... Revision Date: 5-6-13 . Author: Wendy Fleming Created Date:AGREE 396 375 hp CARB 1967 AND LATER. TWO WAYS TO TELL: 3310A WOULD BE A 1965 Z-16 425 HP CARB 3310-1 and the metering block and the date code means after 1966. 3878261-EH is a Chevelle BB code. Most likely a 396 375 hp application and I typically assume it was for the 375 hp engines. Tom V. I have 8 or 9 of those on the shelf.This is a 750 cfm Holley carburetor that we'll be using to set idle quality on a small-block Chevy on a test stand. This is a vacuum secondary 4150 style carburetor with two idle mixture screws. To begin this process, we'll assume the engine in question is in good physical condition with no dead cylinders, no misfires, vacuum leaks, or ...I have a question about the date coding on a Holley 600 cfm carburetor - C8OF-9510-D. Would a date code of 7B4 be correct for a 1968 Cougar XR7 GT produced on 12/19/1967? I understand that 7B4 means the 4th week of December 1967. Logic seems to indicate that the 19th would be the 3rd week of December using Sunday as the first …Carburetor 2 Barrel for Ford 2150 W/Climate Choke For Many V8 Engines 302 351 US. Find many great new & used options and get the best deals for Holley List 3310-1 4 Barrel 780 CFM Carburetor Date Coded 3443 at the best online prices at eBay! Free shipping for many products!They were originally use on 427 low riser applications for Galaxies. They were only 600cfm ea. The OP has a 710 cfm carb used on '65 medium riser engines. '66 GT350H-3 time cover car - Car Craft July'77,Modified Mustangs and Fords Feb2011 ( w/article), Mustang Monthly June 2014.

The carb was installed at the St Louis plant so a typical correct carb would be dated about 2-4 weeks prior to the cars assembly date. Holley date codes went to 4 digit code around 1970 Last edited by Donald #31176; 03-07-2009 at 12:25 PM .4478 posts · Joined 2000. #2 · Apr 6, 2009. 3 digits are common Jeff as my 1969 Holley 4346 has a date code of 924 which represents (9)1969, (2)February, (4)4th week. To be honest I don't know if the 1965 carbs were coded the same as the 1969's. One might think it could be a 1970 carb from the fourth week of May (if you followed the same ...This carburetor was made by Holley , The Holley Brothers Company was started in 1905 in Detroit Michigan then became the Holley Carburetor Co . It is a H4-4160 . This carburetor has a part number of 1850-4 and used on 600 CFM . Check here for specific Muscle car Info: Referenced by ; Holley 1850-4 ...First off the carb is a Holley 780 cfm could someone help de-code the numbers a little further? 3959164-GE List 4346 952 I have many more questions regarding this car that I will post. The fuel line size, rectangular port heads and the fact the car was Oct-Nov 69 build date. But let's start with the carburetor. thanks!

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Find many great new & used options and get the best deals for Holley Parts Carburetor 3310-1 6R2762 Date Code 2772 No Reserve at the best online prices at eBay! Free shipping for many products! ... Holley Carburetors for 750. Holley Car & Truck Carburetor Parts. Holley Carburetors for 600. Holley Carburetors for 850.Holley started using 4-digit date codes in 1973; original '67 carburetors had 3-digit date codes that started with either a "6" (for 1966) or a "7" (for 1967). For 3-digit date codes, the first digit is the year, the second is the month of the year, and the third is the week of the month.4 active coupon codes for Holley in May 2024. Save with Holley.com discount codes. Get 30% off, 50% off, $25 off, free shipping and cash back rewards at Holley.com.Carburetor overhaul Gasket Kit for Honda Acty HA3 HA4 Carburetor MT Genuine*. $34.13. Trending at $46.00. Find many great new & used options and get the best deals for Holley Parts Carburetor 3310-1 6R2762 Date Code 2772 No Reserve at the best online prices at eBay! Free shipping for many products!

397 posts · Joined 2012. #2 · Apr 15, 2020. Was used on hiperformance Big Block cars, not just Camaros as well. There is no date code on the horn, below the p/n. Most likely a warranty carb. Restored $750-$1000. Some go higher. Needing complete restoration and finishing, maybe $250.I'll show you how to read the Edelbrock carburetor Julian date codes so you know how old your carb is. Why is this important? The older the carb the potent...New member. I have a 1968 800 with a 345. The Holley carb is a 2 barrel 500 cfm 4412-5 with a date code of 2644. I am trying to get a rebuild kit for it. None of the local parts stores have a listing for it. One of them said it was a 2300 and sold me that kit. The metering plate gasket is wrong and the power valve is totally different.Holley Performance Rebuilds our OEM/Holley DZ-302 Carburetor. One of the best kept secrets (or worst, depending on who you ask) about Timeless Muscle Magazine, is the rather vast array of classic iron project cars we have in dire need of attention to restore them to their former glory.In addition to our '68 Firebird and '70 Chevelle SS, we also have a '69 Chevy Camaro Z/28 you'll be ...A friend of mine purchased this Holley carb which has the following numbers: C9AF-9510-J LIST 4609 It's supposed to be for a 428, but was curious exactly what it may have came on originally. ... 1966 T-Code Coupe (1st Car, Sold), 1967 GT 350 4-Speed w/original Paxton SC (Sold), 1970 Boss 302, 4-Speed (Sold), 1969 GT S-Code Convertible ...Features original GM part number 3967477 and holley list number 4557 on the front air horn, just like originals. This is a brand new in the box holley carb. Gold iradite plating as factory units. Correct for four speed, manual transmission equipped models. Fresh to date technology with the right old school look. Tested and guaranteed, ready to ...Mar 5, 2023 ... Carburetors can be scary to some people. Rebuilding a carb doesn't have to be hard, or complicated. We use the K.I.S.S. principle (Keep It ...20% OFF $125+ use code: GROW20 Online, Ship to Home Only. See Details. FREE SHIPPING on most orders of $35+ & FREE PICKUP IN STORE. ... Holley carburetors have powered every NASCAR(R) Sprint(R) Cup team and nearly every NHRA(R) Pro-Stock champion for four decades. Now, Holley EFI is dominating the performance world as well as our products for ...The Holley 4-barrel carburetor is one of the most famous pieces of speed equipment ever built. With an unbroken production run spanning more than six decades, this iconic design stretches through the vast majority of hot rodding's entire history. It's a legacy that includes all facets of custom cars, racing, and rodding.On the Airhorn. That's the tallest part of the carb. Look for a List number . Need help ID'ing a Motorcraft Holley carb... The list number is 7508-1 . I've rebuilt many carbs over the years but never a Holley. I looked on the Holley website and got the master list but the number on my carb is not on the list. A Holley carb book doesn't list it ...

Holley still offers original list number carburetors for highly collectible muscle cars. Over time these carburetors have been nearly impossible to find, but no longer. These are NEW nearly exact reproductions of the originals. List Number 0-4792 is the 350 CFM "Center" Six Pack Carburetor that Originally came on 1970-71 Chrysler 340 CID Engine Applications with an Automatic Transmission ...

Holley Carburetor Identification Codes. ENGINE . HPOriginal Holley DZ carb dated 874 or 4th week July 1968 for a late 68 or early 69Z. I had gotten this several years ago and it was in pieces missing, some choke items and the 5583 primary block it does have the original 4519 secondary block and I have found a NOS 5583 block and bought the missing choke pieces. this will need rebuilding but better to be restored as the new block does not match ...Numbers that are preceded by '6R' or other combinations of numbers and the letter 'R' are casting numbers referring to a particular part of the carburetor and cannot be used to identify the carburetor. click on a link below for kits, floats and other parts listed by carburetor number. Holley List Numbers. R-120 to R-1324; R-1343 to R-2345; R ...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. So if you can help, I would be happy. Thanks. 1374 = 137th day, year ending in 4, like 74, 84, 94. 2502 = 250th day, year ending in 2, like 82, 92 etc.What type of carburetor are you looking for? 2-Barrel. 4-Barrel. Gasoline. Methanol. E-85. Automotive. Marine.EFI - Fuel Injection. Carburetors. Carburetor Components. Fuel Pumps Regulators and Filters. Also in Air & Fuel Delivery. Air Cleaners. Air Scoops. Cold Air Intake. Fuel System Kits.Date code type Code meaning Example Components typically found with this type of date identification; A: Alpha-numeric 2 digit code: Month & Year: E9 = May 1969: Carter carburetor base, Carter Fuel pump, Viscous fan drives, drive shafts: B: Single digit: Year: G = 1971: Engine identification pad: C1: Two digit: Month & Year: 71= 7th month (July ...

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Description. Original Holley 3247 Corvette Carburetor 1966 date code 641. This is carburetor with for a 1966 Corvette with a 427 engine making 425 hp.The General Motors number is 3886101-EI. Restored to its original Holley color, all of the steel hardware has been re-plated to the original finish. Carburetor retains the factory Holley calibration.Overview Of The Holley 4150 Vacuum Secondary Carburetor. Overview of a Holley 4150 mechanical secondary carburetor, Double Pumper.Step 2. Locate the Holley model number. After determining the carburetor is a Holley, look for the code numbers, usually located on the side of the air horn. The Holley model number is present along with the auto maker part number, if factory-issued, a date and application code. Locate the lone four-digit code.Dec 13, 2014 · 163 means it was made in 1971, 6th month, third week. Still worth 2-3 hundred or more for a good core, even though it is a late date. 4296 was originally used on 69 L88 and ZL-1 427's. Jon N. ~ The person who doesn't listen to the media is the best informed. Step 2. Locate the Holley model number. After determining the carburetor is a Holley, look for the code numbers, usually located on the side of the air horn. The Holley model number is present along with the auto maker part number, if factory-issued, a date and application code. Locate the lone four-digit code.Carbs include sugar, starch, and fiber. Some disorders affect how your body uses these nutrients, causing health problems. Learn more. Metabolism is the process your body uses to m...Holley used 3-digit date codes on OEM production carburetors, and used 4-digit date codes on service replacement carburetors starting in 1970; the format of the 4-digit code is jjjy, where jjj is the julian date and y is the year so "3465" would be about December 10, 1975). The OEM 3-digit code is25548 posts · Joined 1998. #4 · Apr 5, 2005. I think that 3837 is a regular 780 divorced choke Holley, similar to what GM used on the rest of their performance engines. Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife. Like. Real original GM Holley carburetor. Correct Holley part number 4053 'DZ'. Date code is 942, second week April 1969. Exact fit for all Camaro small block Z/28 models. Would maybe need a rebuild before using. I need some help identifying a holly carburetor. The car is a '71 LT-1. The carb has the following numbers. 3989021. LIST 4801-1. 2678. The first two numbers make sense to me...i believe these are correct for a '71 LT-1. The bottom number (according tovPrince's 68-72 restoration guide) is supposed to be a date code; first number last digit of ...Find many great new & used options and get the best deals for 1970 Corvette Lt1 Camaro Z28 Holley Carburetor 3972123 List 4489 Date Code 061 at the best online prices at eBay! Free shipping for many products! ….

On a Holley carburetor, how do you read the date code? The Julian callender is used to calculate the Holley 4-digit date code. Except for "leap-year1-366," there are 1-365. The LAST YEAR of the DECADE is represented by the fourth digit. "If you believe you can or cannot do something, you are correct."One of the most trusted carburetors of all times -the 1850! Its 600 CFM of airflow, vacuum secondaries, single fuel inlet and mechanical choke makes it amazingly universal. The 1850SA is constructed from aluminum which compared to its zinc counterpart equates to a weight savings of 40%! Being aluminum also means it will hold its shine and can be hand polished for a custom look! Don't trust ...Jul 2, 2018 ... I have a 1970 351c M code with a 4v, and when I obtained the car, it had a Holley 4bbl carburetor. I'm considering putting a new carburetor ...Holley 4150 Identification. Carburetors are 1st identified by models as (4150). Each model has many part numbers for various engines & applications. It is important to properly identify the carburetor using the LIST number as illustrated before purchasing parts. Most carburetor parts, carburetor kits especially are associated with the LIST ...Holley Carburetor List 3418-1 Corvette 1969 L-88. $ 799.00. Restored Holley List 3418-1 for 1969 L-88 Corvette. This carb will be back in stock soon, please contact for completion date and date code. Out of stock. SKU: HOL-3418-1 Category: Carburetors-Restored. Description.Find many great new & used options and get the best deals for 1970 Corvette Lt1 Camaro Z28 Holley Carburetor 3972123 List 4489 Date Code 061 at the best online prices at eBay! Free shipping for many products!They were originally use on 427 low riser applications for Galaxies. They were only 600cfm ea. The OP has a 710 cfm carb used on '65 medium riser engines. '66 GT350H-3 time cover car - Car Craft July'77,Modified Mustangs and Fords Feb2011 ( w/article), Mustang Monthly June 2014.Holley carb date codes are easly to read. Holley used 3 digits till '73 i believe. Example below. 612 date code would be: 6 - year (1966) 1 - month (Jan) - Last two months would be Letters 2 - second week of month Reply Like 10-23-2021, 06:13 PM #13 ...Holley Date Code « previous next ... Holley Date Code « on: January 19, 2010, 03:01:28 AM » I have a dz carb with what looks like a 8 B 1. The first number is really plain. The second sure looks like it has a straight line at the front which makes it look like a B. Any help with this would be greatly appreciated. Tweet. LoggedYour date code "123" could be a 1961 or '71 carb, third week of Feb. The only mention I see of that carb number is for use on a 1964-'65 Corvette w/a 327. I'm not much on Corvette info, perhaps there's some other explanation of the carb. For instance, a Holley was used in 1971 on the 330 HP 350 cid engine, lesser engines got the Q-jet. Holley carb date codes, It originally came on a 1965 Z16 Chevelle. It was made the first week of May in 1970. A foreign car bought is an American job lost! Correct, this is for a used Holley carburetor List 3310. It has the GM part number on it of 3878261 EH which is correct for the 1965 Chevelle Z-16 with the 396 engine. However the date code on the carb is 051 which ..., This is an original Holley Carburetor, C9OF-9510-H. ... Holley C9OF-H-4345 884 Date CARBURETOR 1969 428 CJ Ford Torino Automatic. West Coast Classic Cougar Inc (2344) ... origin ZIP Code, destination ZIP Code and time of acceptance and will depend on shipping service selected and receipt of cleared payment. Delivery times may vary, especially ..., Holley Carburetor Identification Codes. ENGINE . HP, Holley offers a variety of replacement and upgrade metering block and plates for your Holley Carburetor, sec carb: 2502. These should be the date codes, but im used to seeing 3 digits. So if you can help, I would be happy. Thanks. 1374 = 137th day, year ending in 4, like 74, 84, 94. 2502 = 250th day, year ending in 2, like 82, 92 etc. You get the picture I'm sure. The 4 digit date codes started coming in around 1973., Carburetors - Holley Performance Products It shows the 3310-2 through 6 as 750 cfm. ... Oh yeah, its not an original 3310-1 because the date code is a four digit #. The orignal carbs had a three digit date code. [This message has been edited by chicane67 (edited 10-23-2002).], 1969 Holley Carburetor 4346 - 780 CFM Big Block 396, 427, 3959164 New correct design Holley carburetor for your 69 Chevelle and Nova. Exact for all 1969 big block 396 / 375 and 427 / 425 high performance models. 780 CFM delivers the needed fuel to give optimum response to your ride. ... No date code stamping, so you can add whatever you like ..., The Holley 4-digit date code is based on the Julian callender. 1-365 except for "leap-year...1-366. The fourth digit is the LAST year of the DECADE. "If you think you can do a thing or think you can't do a thing…you're right." Sorry rocherman, I have factory ford carbs with 4 digit date codes., I have two Holley carbs. both numbered 3906631-DA list 3810. But the date codes are 943 and 984. I checked all of my books and only the 67 corvette is listed using this number, does anyone have info. on other Chevrolet applications using these numbers?. If I am reading the dates right they both are from 1969, Thanks! Greg, The Holley manufacturing date code format is Year, month, week. from my research I discovered the year date is the actual year Holley made the carb. This is based and verified on the very first carbs being produced. The Holley 4053 part number 3923289-DZ began production for the 1968 Z/28, L78, L89, & the L72., Home / Support / Carburetor Rebuild Component Selector. Carburetor list with kits: here (PDF) Enter your carburetor list number below. Carburetor Selector. Engine: Your …, Holley carb code date chart dating autolite ford offline. Carb dating: autolite and holleyHolley carbs decode corvetteforum thesaint Holley power chart max 1800 ls1tech vsCarb holley jet ford 1904 question jets. Holley carbDating a zippo lighter Date codes holley nastyz28 copoHolley 2300 tech specs., The Holley 4160 carburetor was introduced as an updated version of the 4150 in the 1970s. ... (1850-1, date code 2188). Single fuel feed but it has a secondary metering block, not plate. Would the carb be set up like this because it has a 250 wet shot NOS? Trying to figure out what I need for basic rebuild., New member. I have a 1968 800 with a 345. The Holley carb is a 2 barrel 500 cfm 4412-5 with a date code of 2644. I am trying to get a rebuild kit for it. None of the local parts stores have a listing for it. One of them said it was a 2300 and sold me that kit. The metering plate gasket is wrong and the power valve is totally different., 163 means it was made in 1971, 6th month, third week. Still worth 2-3 hundred or more for a good core, even though it is a late date. 4296 was originally used on 69 L88 and ZL-1 427's. Jon N. ~ The person who …, Your car’s carburetor comes equipped with several jets, depending on the model. These jets help control the flow of fuel in different sections of the carburetor. Over time, gasolin..., Decoding the Ford Holley date code. Holley Carburetors with 3 digit Numeric date codes. This sample code is from a 1969 BOSS 302 carburetor with date code 951. 9 51. Year. 9 = 1969 . 0 - 9 9 5 1. Month . 5 = May . 1 - 9 = January through September . 0 =October A =November B =December 95 1. Week . 1 = 1st week ., Very nice used Holley carburetor that was removed from a 1985 Mustang GT 5.0 Carburetor appears original. Frod part number: E5ZE-9510-GA Holley Part number:LIST 50265 Holley Date Code: 1575 May 1985 per the experts This is untested and are not guaranteed to work and sold as a core to be rebuilt., For Holley carburetors, the two most common model numbers used in both auto and truck applications come the 4150 and 4160. Step 3: Now cross-check the model number with a Holley carburetor listing. Once you have found the Holley model number on the carburetor, it is time to now cross-check this model number with an existing Holley listing., If your Holley carb has a FOUR digit date code...that code. was ONLY used for aftermarket carbs... The Holley 4-digit date code is based on the Julian callender. -. …, 1967 Holley 3916143 CT Stamping Date code "742" (2nd week of April, 1967) 1968 Holley 3923289 DZ Stamping Date code "833" (3rd week of March, 1968) 1969 Holley 3959164 GE Stamping Date code "935" (5th week of March, 1969), Carb date decode. Jump to Latest ... The four digit date codes came in about 1973. Holley has changed their part numbering system at least twice since 1969. The 91, 01, s/r metering blocks usually have two seperate #s stamped on each metering block while the 69 part would have only the numbers 5583 and 4519 stamped on the primary and secondary ..., I have a 71 LT-1. As you guys know, it came with a holley carb. List #4801. I was recently made aware that there are 3 numbers stamped on the side. 1)GM part number. 2)Holley List number. 3)Date code (3 or 4 digit) The question i have is the date code, can anyone shed light on the date code. The differences between the 3 digit/4 digit., https://www.holley.com/products/fuel_systems/carburetor_components/rebuild_kits/ Are you looking for a rebuild kit, parts, or specifications for your..., Apr 2, 2014 · I have a question about the date coding on a Holley 600 cfm carburetor - C8OF-9510-D. Would a date code of 7B4 be correct for a 1968 Cougar XR7 GT produced on 12/19/1967? I understand that 7B4 means the 4th week of December 1967. Logic seems to indicate that the 19th would be the 3rd week of December using Sunday as the first day of a week in the count. Thanks! Steve , Casting and date codes are also on each major component and many ancillary pieces. Cylinder heads have casting numbers with date coding like the engine block. ... Holley carburetors were first used on the '64 365-hp 327-ci engine. The 1965 350-hp and 365- hp small-blocks, and the 396-ci big-blocks used Holley 4-barrel carburetors. In 1966 and ..., carburetor bowl hdl-ley on models aai and 2110 number is stamped on tag. on model 852 number appears on plate mounted on air horn body. (on new units the number is stamped on float bowl. ) model 4000 list number stamped …, Carbohydrates or “carbs” get a lot of attention these days and it’s no secret that carbs can affect your blood sugar (blood glucose). You might be wondering if you should eat less ..., All Holley power valves are stamped on the side or, as in this case, the metal reinforcement near the center. You can see an "8" and a "5" making this an 8.5"Hg power valve. The stamps on the top are date codes. The range for standard Holley valves is from 2.5 to 10.5 "Hg (inches of Mercury)., Holley LIST 50265. Holley Part number:LIST 50265. Holley Date Code: 1575 May 1985. Holley Date Code: 1575 May 1985 per the experts. Ford Holley. Very nice used Holley carburetor that was removed from a 1985 Mustang GT 5.0., Belts. 026x. «02» = February (01-12 = Jan-Dec) «6» = 196 6. x = Unknown (Poss A-Z may appear here, or blank (?)) York A/C Compressor. How to Read FoMoCo Date Codes Original Ford glass, sheet metal and other parts were usually date coded in one of several formats. To perform the most accurate., The 3923289-DZ is the GM part number. The List 4053 is the Holley number and the 902 is the date code. The Holley List 4053 carburetor was used by GM on all 1968 Chevrolet models with the L78 396/375HP and L72 427/425HP engines. It was also used on 1968-1969 Z/28 Camaros with the 302 engine. The 902 date decodes as the 2nd week of October, 1969 ..., CRG's Carb page states "Service parts assembled 1973 or later will have four digit date codes" for Holley carbs, so it could be 73, 83 etc as Jon said. 1969 04A …