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#14
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The vin will confirm the engine. The 351 with 4v is M I think, the non Cobrajet (Thunderjet) 429 is N and the non ram air CJ is C and the ram air is J. I'm pretty sure that ram air was available on engines other than CJs but don't know if that changed the engine codes. The SuperCJ is much different on 429s than 428s. The SCJ got a horsepower bump of 5hp but was actually more. Solid lifters, different carb etc.
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