1968 Plymouth
1968 Plymouth Road Runner / Satellite restoration
1968 launch — RM/RS/RP fender tag scheme, 1968-only launch-year 440+6BB on the 1968 GTX 440+6BB.
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Per-year guides
1968 Plymouth
1968 launch — RM/RS/RP fender tag scheme, 1968-only launch-year 440+6BB on the 1968 GTX 440+6BB.
1969 Plymouth
1969 muscle-peak — four-trim sub-variant taxonomy, 1969-only N96 Air Grabber vacuum-butterfly cold-airhood.
1970 Plymouth
1970 Shaker transition — 1970-onward A38 Shaker twin-snorkel scoop, 1970 R-coded Hemi replacing 1968-1969 LBU.
1971 Plymouth
1971 reduced-output — 10.0:1 compression carryover, 1971 lineup closure of the GTX, 1971 R-code Hemi FINAL YEAR.
1972 Plymouth
1972 Hemi-deleted — 8.5:1 compression reduced-output carryover, no 426 Hemi option after 1971.
1973 Plymouth
1973 emissions-era run-out — catalytic converter + EGR + 8.5:1, 383/440 at 250 hp / 320 lb-ft, B-body muscle-peak closure.
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