Chevy Engine Codes Menu
To decode the engine prefix code, go here. (How to decode engine codes)
Select the section below which the suffix code you'd like to find falls under. For example, select "DTR-HQ" if you'd like to find code DZ. In some cases suffix codes are reused twice or more over time, in this event check the block casting date code and then see what year the block was made to pin down what application your block was originally used in.
Location: Small block Chevy - on the machine pad in front of the passenger side cylinder head. Often hidden by the alterator. Big Block Chevy - above timing chain cover.
Small Block Engine Suffix Code
Menu
3N - CDR | CE - CMJ | CMK - CUD | CUF - DTM | DTR - HQ |
HR - TBS | TBT - TJS | TJT - TXB | TXC - UTT | UTU - ZY |
Big Block Engine Suffix Code
Menu
0FC - 9XZ | AAA - CTB | CTH - IJ | IK - MZ | Q - YZ
Note: CODE CE was used from 1968 to current year. It represents any
CID and is used to indicate a Warranty Engine.
VF292800 - is an
example of a over the counter crate engine. "2800" is the last 4 digits of the
GM part # for the crate engine assembly. The final digit could be a year
code.
Another example: A Targetmaster engine (p/n 14009800) built in 1985
could have a code stamped as follows:
A0198005 (A = january, 01, 9800 = pn, 5
= 1985).
The above list of codes is a summarization, it is not complete.