Q:

Where is the GM engine identification stamp?

A:

Quick Answer

General Motors displays its GM identification numbers on the head and bottom-end of its engines. Each casting number represents a different sized engine variant.

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Full Answer

The following list shows casting numbers from seven General Motor engines.

  • 12556743 is used for the 1999 LS small block V8 engine
  • 12559895 is used for the 2000 LS small block V8 engine
  • 12562317 is used for the 2001 LS small block V8 engine
  • 12550592 is used for the LS1 engine
  • 10106179 is used for the LT small block V8 engine
  • 10205245 is used for the 1993 LT small block V8 engine
  • 10174390 is used for 1991 LT small block V8 engine
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