Holley date codes

As of today, if you download the "Sniper EFI SD Card Contents" link for the support page for the Sniper EFI, you get firmware version fw_02_00_0310. If you look at the latest Sniper EFI Firmware Revision Log, the latest version should be FW_01_03_0500. I downloaded the version 2.0.31 and loaded into my Sniper ECU.

Holley date codes. C1 & C2 Corvettes - Holley 3605 date code - A friend of mine has a Holley 3605 which is supposed to be the correct carbureator for a 66 Corvette 327 with A.I.R. it has a date code of 214. From everything that I have read, the first digit is the year, the second digit is the month, and the third digit is the week of...

A friend of mine has a Holley 3997788 6238-1. The numbers show it's a 1972 Z/28 with auto trans carb. The date code is a four digit code (1354) so it's a replacement carb from what I've researched and the "4" is the year of manufacture.

Congratulations on finding Take advantage: up to 45% discount at Holley Girl, a once-in-a-lifetime offer. For now, you can have access to Take advantage: up to 45% discount at Holley Girl. You will save $37.9 on average in Take advantage: up to 45% discount at Holley Girl. Don't forget to check the expiration date of Coupon Codes so you don't ...2702 posts · Joined 2009. #2 · Feb 23, 2012. carb date 0502. according to "holley carb date code". 050 is feb. 2= 1962,, 1972. 1982, 1992. This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.Best Holley promo code available is : 23WINTER. Save on every purchase with 25000 + shopping stores using our discount codes, coupons, deals & offers. Auto Replacement Parts Fuel Injection Car Parts. Save Big with HOLLEY Discounts. Save Up to 50% at Holley. ... Always Up-to-Date: Finding a great deal is only half the battle. You need to …Holley carburetors used in a Ford factory application use either a three-character date code or a four-character date code depending on when the carburetor was produced. Holley used three-character date codes for the carburetors originally used on 428 CJs and SCJs. The four-character date codes began appearing on OEM and aftermarket carbs at ...Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. Thus, Holley can not guarantee an answer or timing on an answer. ... Date code: 20180830 FW Ver: 4.0 build 110 Profile #1 TPS Calibrated: Yes HEFI type: HP And other info on GCF file and time stamps ...

Date Codes . Home Choke Circuits Date Codes Exploded View Part Numbers Q & A Setup Specs Vacuum Secondary Spring Chart ... Holley Four-Digit Date Codes. First Three Digits. Fourth Digit. Julian Date Stamp. Month. Year. Regular Year. Leap Year : Stamp. Year. 001-031. 001-031. January. 3 . 1973/1983/1993: 032-059. 032-060.C1 & C2 Corvettes - Holley 3811 date code - Any wisdom on my carb. It is a 3811 / 4160 with a date code of 0503. Everything that I can find states that this Carb was only used on the 1967 390 HP 427. Does 05 mean 1965, O mean October and 3 mean third week? Or or is this a newly issued Carb by Holley? Some sources show...05. There are three different numbers to know on a Holley carb used as OEM equipment on a vintage Mustang or Shelby: the Ford or Shelby part number, the Holley List number, and the date code. This ...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. …Feb 27, 2009 · And yes, the date codes on Holley carburetors are decoded as follows: first number is the year (in this case 1969), second number is the month (in this case 4 = April), and the third number is the week it was produced (in this case 2 = second week). if the carb has a 4 digit date code it is not made is the 1960's and is worth less than a 60's made Holley 715. Four digit date date: first number is the year made, last three digits are the day of the year. ex: 7122 = carb made in 1977 (or 1987, or 1997, etc) and the 122nd day of the year. Z.Holley 2300 Identification – Where to find the Holley LIST number. The LIST number is used to match the correct carburetor parts. There are a several carburetor kits for the Holley 2300, so it is important to find the carburetor number and matching the carburetor number with one of our kits will insure you get the correct carburetor kit.Most …9.5" POWER VALVE ASSEMBLY WITH GASKET FORD 2100 2150 4100 MOTORCRAFT AUTOLITE. $9.99. Trending at $19.98. Find many great new & used options and get the best deals for Holley List 1272 Carburetor Date Code ECZY 4150 Series at the best online prices at eBay! Free shipping for many products!

Pre-72 Holley date codes. Jump to Latest Follow 1K views 2 replies 3 participants last post by RixLS6 Jan 31, 2007. C. CT Mark Discussion starter 1331 posts · Joined 2002 Add to quote; Only show this user #1 · Jan 31, 2007. Just trying to get confirmation on something. The ...With a 8A1 date (8 = 1968, the "A" stands for November, 1 = 1st week of November) for a 69 Z28 it would probably bring at least $250 just as a core. ... The 396/375 cars used a 4346 Holley anyway. It is strictly a Z28 carb. Authentication and pre-purchase inspection service still available. PM me for more information. :thumbsup:Holley date codes? Pontiac - Street. Remember Me? Join us now!Holley Coupon Codes 2023. 16 Verified Coupons - last updated: October 22,2023. SUBMIT A COUPON. 12% OFF. 12% Off with Holden Promo Code. Verified • uses.600: 37-119 37-933: 6-506 122-66: 134-9134-128: 125-65 0.025: Plain 108-83-2: 108-89-2 108-90-2: 108-27-2 134-101: 134-105 112-20: 1-1/4 1-5/16: 1-9/16

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Date Codes . Home Choke Circuits Date Codes Exploded View Part Numbers Q & A ... Holley Four-Digit Date Codes. First Three Digits. Fourth Digit. Julian Date Stamp. Month. The difference is in the front metering block. I have a '67 4-speed carb on my 390 GTA. It works fine, but I want the correct automatic version as listed in my signature (late '66 or early 1967 Holley LIST 3794 C7OF-9510-B for S code 390 GTA or just the metering block 5230). What is the date code on the automatic carb? WANTED PARTS: ☆ '67 ...Holley is home to the top automotive performance brands including Flowmaster exhaust, MSD Ignition, Holley EFI, Hurst Shifters, Accel plug wires, Hooker Headers and many more. 600: 37-119 37-933: 6-506 122-66: 134-9134-128: 125-65 0.025: Plain 108-83-2: 108-89-2 108-90-2: 108-27-2 134-101: 134-105 112-20: 1-1/4 1-5/16: 1-9/16 carb date codes. Jump to Latest Follow 1 - 3 of 3 Posts. M. musstangr · Registered. Joined Aug 18, 2006 · 24 Posts. Discussion Starter ...

How to Install a Holley Terminator X Max ECU on a Ford Coyote Engine. Staff Writer. 07/27/2020. 10 min read tech. ... Bradley Iger. 05/02/2024. tech. LS Fest LS Fest West 2024 LS Fest West. LS Fest West 2024: Dyno Challenge. 05/01/2024. Events. Join the Holley Family. Stay up to date with the latest releases, events, promotions and more. Sign ...Find many great new & used options and get the best deals for HOLLEY carburetor---3878261-EH- list3310 --date code 073 -Chevelle 396 Ho at the best online prices at eBay! Free shipping for many products!Have a Holley 4555 carb date code 051 off of my 70 LT1 vette that no longer has the original block so this carb needs to go to someone that needs it for a restoration. Carb has all its original parts such as the metering blocks, fuel bowels ect.Remingtion firearms. manufactured after 1921. Remingtons manufactured after 1921. have a code located on the left side of the barrel. near the frame that identifies the year and month of. manufacture. The following letters correspond to the. months of the year, for example B=January, L= February. and so on: Date Codes . Home Choke Circuits Date Codes Exploded View Part Numbers Q & A ... Holley Four-Digit Date Codes. First Three Digits. Fourth Digit. Julian Date Stamp. Month. 183 posts · Joined 2007. #2 · Dec 11, 2008. The Holley Illustrated Parts & Specs Manual states thus: LIST-3418-1A (1AAS) IS an OEM Holley carb, listed for 1966/1967 Corvette 427 engine, 425 horsepower, looks like the real deal. The LIST-3418 carb, NO suffix, is the came carb, listed for 1966 Corvette 427/425 only, probably the earlier carb ...600: 37-119 37-933: 6-506 122-66: 134-9134-128: 125-65 0.025: Plain 108-83-2: 108-89-2 108-90-2: 108-27-2 134-101: 134-105 112-20: 1-1/4 1-5/16: 1-9/16Date codesCarburetor holley identifying 2300 forums Holley list 3310-1 date 0743Holley date code codes carbs ing good who translates 346th. Holley carb code date chart dating autolite ford offlineHolley reverse reversing idle Holley pump investigation mapping thorough questions list transfer calibration camsPit stop: holley carb …C1 & C2 Corvettes - Holley 3605 date code - A friend of mine has a Holley 3605 which is supposed to be the correct carbureator for a 66 Corvette 327 with A.I.R. it has a date code of 214. From everything that I have read, the first digit is the year, the second digit is the month, and the third digit is the week of...Categories/ Plumbing AN Fittings and Hose. Vapor Guard. Earls Classic Hose and Hose Ends. Speed-Seal and Speed-Flex. Hardline. Also in Plumbing AN Fittings and Hose. Adapters. All Hose Groups. Application Specific Parts.

The Holley code tells when it was actually cast. It is common that a 1963 design has a casting date of 1968. This is the numerical listing, aka Holley part number. This is what your carburetor is. List 3793, 4118, 2143-1, 4412 pictured. Ok last/bottom line is date code. Early versions had a three digit code.

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. '69 camaro, was orig …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 0-4790 is the 500 CFM "Outboard" Six Pack Carburetor that Originally came on 1970-71 Chrysler 340 CID Engine Applications with an Automatic Transmission ...12-21-2013, 08:19 AM. On my NOS bottle, the date code is 09 ⇧ 1 1 (September, 2011). May God's grace bless you in the Lord Jesus Christ. '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, Eagle 3.470" forged steel crankshaft & H-beam rods, Wiseco 4.200" forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 ...Quote. 1967 through 1969 Holley. The identification number and the date of manufacture are stamped into the forward vertical surface of the air horn. The three digit date code is broken down with the first number being the year of manufacture, the second number (or letter) being the month of manufacture (1 through 0 for January through October ...This carb is off of a 1967 Corvette small block 350, the car ran perfectly until carb and manifold were replaced in early 1970s with an aftermarket manifold and carb, I just sold the original matching manifold a few days ago in like new condition, this carb is in perfect condition, it may have been overhauled back then, but has been off the car for close to 50 years, mounted on the original ...Contains the latest V3 touch screen firmware. 3.5 in. Touchscreen Firmware - V4. Contains latest V4 firmware and installation instructions for the 553-108 3.5" Touch Screen. 3.5 in. Touchscreen Firmware - V5. Holley EFI V5 Firmware update for 3.5" TSLCD. 3.5 in. Touchscreen LCD User Manual.27 Feb 2022 ... I think the windshield install is the most anticipated video for your viewers. Might even set a record for YouTube views.

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Find many great new & used options and get the best deals for Holley List 3130 3869933EF 1965-66 Chevrolet 396 /425HP 427/390 HP Date Code 842 at the best online prices at eBay! Free shipping for many products!Find many great new & used options and get the best deals for Holley List 3130 3869933EF 1965-66 Chevrolet 396 /425HP 427/390 HP Date Code 842 at the best online prices at eBay! Free shipping for many products!The numbers stamped into the choke tower are as follows: 3849804 List 2818 302. The 3849804 is the GM part number. The List 2818 is the Holley number and the 302 is the date code. The Holley List 2818 carburetor was used by GM on 1964 Corvettes with the 327/365HP engine. The 302 date decodes as the 2nd week of October, 1963.OK, let's start posting numbers on stock holley carbs. If you have the original Mustang/Capri Holley carb in your car, please post the codes from the: 1. blue tag AND 2. from the air horn AND 3. the build date on your car's door tag! Also, if anyone can tell me what the 4 digit number on the air horn means or can shed any light as to how these carbs were put together and their date codes ...Sep 1, 2023 · The date code consists of four numbers. The carb date does not go by the Chrysler 10,000 day calendar. The first three numbers indicate the day of the year and the fourth number indicates the year. Therefore, a date code of 3619 from a 1970 440 Holley carb indicates the 361st day of the year (December 21st). The 9 indicates the year 1969 ... For the Carb be careful of people selling a 4 digit date code as original as the are not. It is not just the carb center housing numbers also the primary bowl # stamped 6333 secondary 4519 look for any indication of grind out and re-stamp which is done a lot on the 4555 number. The numbers on the 4555 should look very close to this.For best results, Holley strongly recommends an in-tank pump. Installing the fuel pump in the tank results in quieter operation, less chance of cavitation and a reduction in pump temperature. If mounting the pump in the tank is not an option, install the pump as close as possible to the tank. Within 2-feet ofTechnical Information. Tech Service: (502) 781-9741. Holley Carburetor Numerical Listings. Carb. Primary & Primary Secondary Primary Secondary Primary Carburetor Model CFM Renew Trick Secondary Main Main Jet Metering Metering Primary Discharge Part No. No. Kit Kit Needle Jet or Plate Block Block Power Valve Nozzle & Seat Size. 0-84781 4150 850 ... ….

This is for One Good Used Original Holley Carburetor PN 3810 with GM# 3906631-DA, correct for the Chevrolet Corvette produced in 1967 with 327 CID and 300 or 350 HP. The date code of 8 B 3, (3rd Week of February, 1968) would suggest this is a service dated carb. It is rated at 585 CFM and has a vacuum secondary and choke that operates off of …Please be aware that this is a community forum. Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. ... Holley can not guarantee an answer or timing on an answer. MSD 85551 date code W11. Is this covered for rust. it failed. Collapse. X. Collapse ...that these are the same harnesses used for Holley Dominator and Terminator X Max ECUs): 558-405 - GM 4L60/70/80E . 558-455 - 2009+ GM 4L60E* 558-470 - 1998+ Ford 4R70W/4R75W . 558-471 - 1992-1997 Ford AODE/4R70W . 2 * The "2009+" 4L60E specifically applies to OEM/factory original applications. When dealing with a GM Performance ...Archer1440. Currently VP9L OR's proofed by HK USA don't bear date codes except for the frame molding code inside the frame. You'll find the HK proof mark on the barrel next to the SN toward the muzzle end of the locking block (HK logo in a shield). 2020 and 2021 VP9L upper kits have the Ulm antler mark, date code, Nitro proof mark and ...C1 & C2 Corvettes - Holley 2818 Date Code - I have two questions here. I'm found a Holley 2818 carb dated 4B3 for my 65 327/350 that has a F1215HT pad stamp. First, when a week number is determined, does it matter if it is a full or partial week? Looking at the December 1964 calendar below, is it safe to assume that...I recently bought a used MSD 8546 Pro-Billet distributor. It has a C7 stamped in the body. Is there a way to find out how old it is from this stamping? It also has aluminum spacers that hold the cap down. Which I don't see on the newer version. Thanks, Shane. Shoppers save an average of 13.6% on purchases with coupons at holley.com, with today's biggest discount being 20% off your purchase. Our most recent Holley promo code was added on Apr 23, 2024. On average, we find a new Holley coupon code every 60 days. Med.Rise INTAKE. Aftermarket replacement. Holley list this carb as "1968 Shelby-American 289 Engine". Ford and Mustang Holley 4150 carburetor. Holley casting numbers decode and identification. Correct list numbers and correct date codes for all holley carburetors. Ford Mustang Galaxie Fairlane Torino Mercury Cougar Cyclone Boss Applications.2 Jun 2021 ... My Holley Sniper EFI has been having an issue with a corrupt SD card and in this episode I walk you through how I fixed the problem by ... Holley date codes, Trending at $494.95. Find many great new & used options and get the best deals for Holley 2818-1 Corvette Carburetor 3849804 Date Code 8b3 at the best online prices at eBay! Free shipping for many products!, , Holley Date Code Chart: Reply Like. 09-18-2007, 07:29 PM #9 Dicecal. Melting Slicks . Member Since: Aug 2001. Location: Phoenix AZ. Posts: 2,846 Likes: 60 Received 40 Likes on 30 Posts Quote: Originally Posted by JohnZ. 0814 would be a service replacement, made the 81st day of 1974 or 1984 or 1994; Holleys made after 1972 used a 4-digit julian ..., On a related note, my car was started the 4th week of May, 1968 (05D) and the carb is dated 833 like chedderboys. The 4053 carbs were built in batches and I've seen several 4053's with this date stamp. Now, I'm not sure when the batch before that was built, or the batch after that, but usually, the Holley carbs are a few days to several weeks ..., Significant new changes means something is wrong. • Check the fuel pressure and fuel system components for leaks and restrictions (wiring, plumbing & venting). • Use the appropriate amount of timing advance at idle. Stock cam - 20°, performance cam - 25°, radical cam - 30°., This Chevy/GMC Truck Seat Upholstery set is a high quality product following the factory pleat design, sewing pattern, and factory attachment points. Features Regal velour with vinyl trim for a luxurious feel and look. Includes upholstery with 3" wide vertical pleats with 1" wide vinyl belt across backrest, instructions, hog rings and hog ring pliers. Requires physical seat to be removed from ..., This is aa Holley vacuum secondary 600 cfm carburetor for early 70's Ford applications as it has the lever for the Ford kickdown on it. The date code is 3151. Looks to be all there other than it does not have an inlet fitting., All Holleys through 1972 had 3-digit date codes (year, month, week of the month); all Holleys after 1972 had 4-digit Julian date codes (day of the year, year). Any Holley on a Corvette with a 4-digit date code is a later Service replacement., The date code label is on a label located on either the top of the battery or the back side of the battery. The code on the top is 12 digits with the last 4 representing the month and year. In the example below 0220 means February 2020. The code on the back is one letter, followed by one number. The letter is code for the month. The number is ..., Steve R. 6267 posts · Joined 2000. #3 · Nov 29, 2013. The 1908 directly under the list number is the date of manufactur. Holley uses the jullien date code, 1908 corresponds to the 190th day of a year ending in 8. After every major design change Holley changes the number after the dash (-), hence this carb was manufactured after their 7th ..., Holley carburetor identification numbers are typically stamped on the side of the airhorn. If the carburetor was factory issued, it may have multiple numbers, including the manufac..., Holley Electric Car & Truck Carburetors, Chevrolet Chevelle Cars, Chevrolet Nova Cars, 1970 Chevrolet Chevelle Cars, Complete Engines for Chevrolet Chevelle. Find many great new & used options and get the best deals for Carburetor Holley 3310-1 date code 0653. Used on Camero, Chevelle, Nova. at the best online prices at eBay!, Download our free Chrome extension and iPhone app to have holleygirl coupons automatically added at the checkout with ease. Get the latest 5 active holleygirl.com coupon codes, discounts and promos. Today's top deal: Receive 10% Off With Holley Girl Promo Code. Use these discount codes and save $$$!, Holley Carb - Date Code. Jump to Latest Follow. 7K views 3 replies 3 participants last post by Matt69SS May 20, 2014. Matt69SS Discussion starter. 236 …, This Chevy/GMC Truck Seat Upholstery set is a high quality product following the factory pleat design, sewing pattern, and factory attachment points. Features Regal velour with vinyl trim for a luxurious feel and look. Includes upholstery with 3" wide vertical pleats with 1" wide vinyl belt across backrest, instructions, hog rings and hog ring pliers. Requires physical seat to be removed from ..., Slash 10% Off Clearance! Unlock savings on Holley's select clearance inventory! Use the promo code for an extra 10% discount. Expires Saturday. 7 GET PROMO CODE., Toyota Pickup 20R 22R Weber Carburetor Conversion Kit Manual Choke Kit. $349.00. Trending at $384.95. Find many great new & used options and get the best deals for Holley Carburetor 4555 GM 3972121 Chevy Lt1 Corvette Z28 Camaro Date Code 904 at the best online prices at eBay! Free shipping for many products!, Korbi. Nov 30, 2003 #10. 3 digit Ford Holley date codes are YEAR/MONTH/WEEK. With the January month being 1 and 0 being October. Finally A and B for Nov and Dec. There are a few exceptions, some carb models date codes start with A for January ending with M for December. The last digit in the date code is the Week it was manufactured., 600: 37-119 37-933: 6-506 122-66: 134-9134-128: 125-65 0.025: Plain 108-83-2: 108-89-2 108-90-2: 108-27-2 134-101: 134-105 112-20: 1-1/4 1-5/16: 1-9/16 , Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. Thus, Holley can not guarantee an answer or timing on an answer. Announcement. Collapse. No announcement yet. MSD 8546 Date Code. Collapse. X. Collapse. Posts; Latest Activity;, 362. Location. Pacific NW USA. Four (4) pictures posted below... So this weekend I started the rebuild on my 3310-1 780cfm carburetor. I noticed it has a cracked baseplate on the primary side. Holley sells replacement part #112-9 for a premium, $292.95. At that price, might as well buy an all new carb., HOLLEY 3418-1 with 711 date code Jump to Latest Follow 2K views 1 reply 2 participants last post by Administrator jsvette Apr 27, 2018, Holley’s reproduction units are extremely close to the original units and each still look like a 4150 Holley carb cut in half. Holley’s 500 cfm carb list number 0-4365-1 is the two “Outboard” Six Pack Carburetors that Originally came on 1969-70 Chrysler 440ci 390hp Engines. The original castings had the OE part number 3462373., I've also been told that later year Rally wheels had a 2 digit year (to eliminate the duplication) but my 1979 Corvette with a body drop date of B19 (Sep 19 1978) that has factory original rallys with a date code of K-1-8 8 <hole> 31 AZ which is Aug 31 1978., jimne1 Discussion starter. 3 posts · Joined 2009. #1 · Nov 16, 2009. I'm trying to understand the date code on a 3310-1 Holley. All I know is it is a true 780 CFM with downleg boosters and it came off of a GM car. Byeond that I'm stumped. The date code stamped beneath the 3301-1 is shown as 241. I have yet to find any reference that would ..., Mar 7, 2009 · 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 . , Med.Rise INTAKE. Aftermarket replacement. Holley list this carb as "1968 Shelby-American 289 Engine". Ford and Mustang Holley 4150 carburetor. Holley casting numbers decode and identification. Correct list numbers and correct date codes for all holley carburetors. Ford Mustang Galaxie Fairlane Torino Mercury Cougar Cyclone Boss Applications., Bulova date codes: 1924 - 1949 Between 1924 and 1949 Bulova used a date code symbol on their watch movements to indicate the year that movement was assembled. Between the same years many Bulova watch cases also had a serial number that started with the number corresponding to the year of production. The following table will help you date your vintage Bulova watch movement., Bulova date codes: 1924 - 1949 Between 1924 and 1949 Bulova used a date code symbol on their watch movements to indicate the year that movement was assembled. Between the same years many Bulova watch cases also had a serial number that started with the number corresponding to the year of production. The following table will help you date your vintage Bulova watch movement., Dominator EFI Tuning & Tech. May God's grace bless you in the Lord Jesus Christ. '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, Eagle 3.470" forged steel crankshaft & H-beam rods, Wiseco 4.200" forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio, 232°-244° duration/.623" lift/114° LSA H/R camshaft, Trick Flow R-Series FTI Comp Ported ..., When the code extends to four or five digits, the initial one or two digits denote the year. So, 3156 would be read as June 5, 2023, while 22156 signifies June 5, 2022. To swiftly decode the three digits representing the date, you can refer to this helpful Julian calendar., The 3403 is likely the date code if it's stamped just below the LIST 2818. If so, it's a service replacement carburetor dated the 340th day of 1973, 1983, 1993, etc. ... Find yourself a 3310 "EH" Holley, 780 cfm. They were original equipment on the `65 Z16 Chevelle, and Holley sold about a bazillion service replacements., 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 either 1971, 1981 or 1991. A date code of