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What do these letters and numbers mean that are on the engine deck passenger side of a 454 ci Chevrolet motor?

The letters and numbers stamped on the passenger side of a 454 cubic inch Chevrolet engine's block are the engine's identification code. This code is crucial for determining the engine's specifications and build date. Unfortunately, I cannot tell you what *your* specific code means without knowing the code itself.

However, a typical Chevrolet engine identification code will include:

* Casting Number: This is often a series of numbers, sometimes with letters, that identifies the specific casting of the engine block. Different casting numbers indicate different design variations (e.g., different bore spacing, or features).

* Partial Date Code: Often a partial date code, sometimes just a letter and number, that indicates the month and year of manufacture. Chevrolet used different coding systems over the years, so decoding requires knowing the specific system used for that engine's production year.

* Other Markings: You might also see markings indicating the engine's displacement (like "454"), the plant where it was manufactured, or other quality control markings.

To get the information you need:

1. Find the Casting Number: Carefully examine the passenger side of the engine block. Look for a raised or stamped number sequence. This is the primary identifier.

2. Find the Date Code (if present): Look near the casting number for a partial date code.

3. Use an Online Database or Manual: Once you have the casting number and date code, you can use online resources (there are many dedicated to Chevrolet engine identification) or a Chevrolet parts manual specific to the engine's year to decode the information. These resources will allow you to determine the exact specifications of your 454. There are also printed books and software programs available.

Without the actual numbers and letters from your engine, any interpretation would be pure speculation.