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They are the engine serial number and the suffix code. The suffix codes can easily be decoded. For example, a CRV suffix code is a 454, 450 HP, 4-speed transmission. If the serial numbers that precede "CRV" match the VIN of the car, then you have a numbers matching LS6 4-speed car.

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