How to Identify Engine Casting Numbers on Jeeps

by Marlon Trotsky
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Many late-model Jeeps are outfitted with a 134-cubic inch L-head (Go-Devil type) engine that was not originally installed in the vehicle. Thus, Jeep owners must turn to the engine's seven-digit casting, or engine, numbers to find out what kind of engine they have. These numbers, not to be mistaken for the engine's serial numbers that are stamped onto the metal, are part of the engine casting. Serial numbers indicate the year an engine was made and its displacement.

Step 1

Turn off your Jeep and open the hood, securing it in place with the rod so it will not fall on your head as you examine the engine. Your vehicle should be in park, with the emergency brake engaged to ensure that the Jeep remains stationary.

Step 2

Examine the right side (driver's side) of the engine below the distributor and above the oil pan. The casting numbers are typically found on top of the engine head in the right front corner.

Step 3

Locate the casting numbers which will be raised or recessed, not stamped, making them easily distinguishable from the engine's serial numbers.

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