Plymouth restoration guides
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Cartoon-horn B-body, RM-prefix fender tag, 440+6-Barrel N96 — documented properly.
The 1968–1970 B-body Road Runner is the Plymouth-side muscle anchor on the 116-inch-wheelbase unibody — distinct from the Charger R/T (Dodge-side, XS-prefix scheme) and the Mustang Mach 1 (Ford-side, 1969-onward 351 Cleveland / 428 CJ fitment). The RM-prefix fender tag series (RM21 base Road Runner / RM23 Road Runner 440 / RM27 Road Runner Six Barrel), the 440+6-Barrel N96 M-code on the Six Barrel-only ram-air intake casting 3462341, and the 1969-only N96 Air Grabber vacuum cold-airhood (NOT the 1970-onward Shaker) define the marque. The cartoon-horn door-jamb trim tag callout is the silhouette-defining Plymouth-side exterior ornament.
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