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 |
Started by Mack in 1963/64 Cadillac Specific Discussion. Last reply by Dennis P. DiBari 6 hours ago. 6 Replies 0 Likes
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
Started by Logan Robb in 1963/64 Cadillac Specific Discussion. Last reply by Dennis P. DiBari yesterday. 1 Reply 0 Likes
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
Started by Alan Clark in 1963/64 Cadillac Specific Discussion. Last reply by Logan Robb yesterday. 11 Replies 0 Likes
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
Started by Phillip Hill in 1963/64 Cadillac Specific Discussion. Last reply by Dennis P. DiBari yesterday. 6 Replies 0 Likes
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
Posted by SK on June 2, 2025 at 2:20pm 2 Comments 0 Likes
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
Posted by Chase on March 12, 2025 at 2:05pm 14 Comments 1 Like
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…
ContinuePosted by Ray Schick on August 22, 2024 at 6:25pm 2 Comments 0 Likes
I bought this seat material thinking that it’s…
July 20, 2025 from 8pm to 9:30pm – Zoom
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