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Would you mind checking in that book to see if a 454 engine was offered in the 1975 Blazer? If so, what is the RPO No. and what would the engine vin. no. code be? (3rd digit of the Vin. no.) I would appreciate any help on this matter as I have an M code in the 3rd digit of Vin. no. and am having trouble identifying what engine 'M' represents. Thanks in advance for any help on this matter. Greg.
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