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ENGINE SERIAL NUMBER LOCATION
The K21/K25 engine serial number is stamped on
an angled and machined pad on the right side of
the engine block in the center just beneath the
valve cover.
The machined boss is split vertically by a groove.
The Engine Model number is on the left pad and
the Engine Serial number is on the right pad.
NOTICE
For EPA engine-related troubleshooting, refer to the following
manuals:
• TM100 - “EPA Engine Training Manual”
• SM300 - “K21/K25 Engine Service Manual”