How to Identify 1985 Chevy Truck Motors

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In 1985, Chevy trucks came with nine different motor options ranging from an I6 (in-line six) to a heavy duty 454 ci (cubic inch) V8 to a V8 Detroit diesel. Knowing which engine is in your Chevy truck is vital when it comes to knowing safe towing capacity.


The vehicle's engine specs, along with a list of the rest of the truck's factory options, are available on a sticker called the regular production options (RPO) decal.

  • Open the Chevy truck's glove compartment. The RPO decal is located inside.

  • Read down the list of factory options until you get to the engine code. This is a three-character code beginning with the letter "L."

  • Check the code against the following list to identify the truck's motor. LB1 is the code for a 262 ci V6 engine; L25 is a 292 ci I6; LE9 is a 305 ci V8 (outside the state of California); LF3 is a 305 ci V8 (in California); LS9 is a 175hp 350 ci V8; LT9 is a 160hp 350 ci V8; LH6 is a 135hp Detroit diesel 379 ci V8; LL4 is a 148hp Detroit diesel 379 ci V8; and LE8 is a 454 ci V8.

Tips & Warnings

  • Visually confirm that the truck's engine matches what is listed on the RPO decal before performing repairs or maintenance on it. A mechanic can do this for you if you are not familiar with different engine types. It is not unknown for older trucks to have the engines replaced when they wear out.

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