replacement blocks

[JChlupsa]

From the April 14th 1969 Chevy Dealer Service Information Bulletin Re-Issue 69-I-I Page 6
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Service Usage

The following system will be used to identify service engine and transmission assemblies* including replacement parts. Manufacturing plants will number each service assembly as it is produced. The first letter will designate the G.M. Division which produced the Engine.
C- Chevrolet
B- Buick
L- Oldsmobile
P- Pontiac
K- Cadillac

The second letter will indicate the type of unit "E" engine or "T" Transmission. The number following the letter will designate the Model Year "9" for 1969. The last five digits specify the service replacement unit sequence number.
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It goes on to list the plants/engines and the serial sequence number but I dont think they wil line up here on the fourm so Ill scan them and post that info later.

Example: Number CE900175 designates Cheverolet Engine- 1969 year, and the 175th unit oproduced for service at Flint Motot Plant (L-6)

For trannys it states that hydra-matic transmissions will be numbered with the letter "H" regardless of the G.M. Division using the transmission.