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Re: 4.8 gm interchange
Posted to Technical Discussion Forum on 1/1/2020 7 Replies

The 8th digit VIN X is more than just engine size isn't it? I thought the letter changed when the engine RPO changed, and should be a decent barometer for fitment. Examples being the Duramax VIN changed during the engine updates despite the motor remaining a 6... Login to read more.

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