Engine Unit Number - Decoded and other Information

ENGINE UNIT NUMBER

Number          Shop Manual Name    Description/Location(s)                              
44K2076        Engine Unit Number    Top Rear of Engine by Oil  Pressure sending unit, etched into block.

Information

44K is the Engine Unit # prefix that identifies the engine type. For this example it means this engine was intended for a 6039,  6329, 6339, 6357, 6367, 6267 with air.

2076 denotes the numerical order in which this engine was built.

A decode card for Prefix codes is located on page 1-2 of the 1963 and 1964 shop manuals.    

Decode Info for 1963 390 Engines

Body Styles Engine Unit No. Prefix 

6039, 6229, 6257, 6267, 6239, 6329, 6339, 6357, 6367, 6389 without air cond

36X
6039, 6229, 6257, 6267, 6239, 6329, 6339, 6357, 6367, 6389 with air cond 36K
6723, 6733, 6890 without air 37X
6723, 6733, 6890 with air 37K



Decode Info for 1964 429 Engines

Body Styles Engine Unit No. Prefix 

6039, 6329, 6339, 6357, 6367, 6267 without air

44X
6039, 6329, 6339, 6357, 6367, 6267 with air cond. 44K
6229, 6257, 6239 without air 46X
6229, 6257, 6239 with air 46K
6723, 6733, 6890 without air 47X
6723, 6733, 6890 with air 47K

     

Example 1963 390 Casting # and Engine Unit Number
Example 1964 429 Casting # and Engine Unit Number

Views: 5030

Facebook Facebook

Comment

You need to be a member of 63/64 Cadillac Website to add comments!

Join 63/64 Cadillac Website

Photos

  • Add Photos
  • View All

Forum

Getting hot when going fast…

Started by Mack in 1963/64 Cadillac Specific Discussion. Last reply by Dennis P. DiBari 6 hours ago. 6 Replies

So… I do have a few of 63 Coupes, all have same setup with carbs, Pertronix, shroud, new US Radiator radiators etc … but only one of them gets a bit hot when I am hauling faster than 60mph and car…Continue

Rainstorm out of nowhere!

Started by Logan Robb in 1963/64 Cadillac Specific Discussion. Last reply by Dennis P. DiBari yesterday. 1 Reply

After dinner last night, we went for a quick cruise as the weather was cooler and the sun set was looking really good!Out of nowhere, a pop up shower appeared overhead and down-poured as we were…Continue

Convertible bumper jack

Started by Alan Clark in 1963/64 Cadillac Specific Discussion. Last reply by Logan Robb yesterday. 11 Replies

My car lacks the mechanism or spring needed to hold the jack in the storage slot on the right side of the trunk.  Anyone have a picture of the item I should find?Continue

Front grill

Started by Phillip Hill in 1963/64 Cadillac Specific Discussion. Last reply by Dennis P. DiBari yesterday. 6 Replies

Hi everyone im currently restoring my my front grill due to some previous clown painting it with silver frost paint and doing a dodgy job I would like to know what parts of the grill are anodised.it…Continue

Blog Posts

1963 RHS A/C kick panel - photos needed

Posted by SK on June 2, 2025 at 2:20pm 2 Comments

Could someone post front and back photos of the 1963 right-hand kick panel with A/C?

My car didn’t come with the original kick panels, so it's a bit of a mystery to me how I should cut the backing board and carpet to fit around the A/C.

Many thanks,

-Samu

Edelbrock Carb Block off Plates

Posted by Chase on March 12, 2025 at 2:05pm 14 Comments

Hey guys,

I have installed the same Edelbrock carb and have done everything the same as Jason’s carb and intake project. In the spring and summer months the car starts, runs and idles great! In the fall and winter months on a cold start, the car starts awful and wants to die until it warms up. I have to keep my foot on the throttle until it warms up or it will idle just terrible and try to die. Once it’s warm, it runs fantastic! Whats going on here? I was thinking of removing the…

Continue

'63 Tailfin Tales

Posted by Mark Mata on February 22, 2025 at 5:00pm 9 Comments

New old stock seat material

Posted by Ray Schick on August 22, 2024 at 6:25pm 2 Comments

I bought this seat material thinking that it’s…

Continue

Videos

  • Add Videos
  • View All

© 2025   Created by Jason Edge.   Powered by

Badges  |  Report an Issue  |  Terms of Service