Superbirds/Daytona Chargers is statement true?

[MultiMopars]

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If you spot a 70 Road Runner with a "U" engine code (I.E. RM23U0), it's a 'Bird.

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For the uninitiated, that's because the Roadrunner came with the 383 (N code) or the 440-6 barrel (V code) or the Hemi (R code). Only the GTX and the Superbird came with the 440 4bbl (U code) in 1970.

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Yes, all of the above is true but may confuse some here. The "U" code engine is the standard engine for a S-Bird but it was available optionally with both the six barrel and the Hemi as well.