Specifications, Part & Services, Museums & Clubs for Antique, Classic, Vintage and Muscle Cars

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1968 Plymouth Road Runner Series
Coupe
Standard Specifications
  Show Summary  
Original Base Price $2,895.00
No. Produced 29,240
Body Maker Plymouth
No. Doors 2
Passengers
Model Number RM21
Weight 3,405lbs
Wheelbase 115.5 inches
Length 202.7 inches
Width 76.4 inches
Height 53.1 inches
Front Tread 59.5 inches
Rear Tread 59.2 inches
Type V8, OHV
Displacement 383 cu. in.
Cylinders 8
Bore & Stroke 4 1/4 & 3 3/8 inches
Compression Ratio-Std 10.0 to 1
Compression Ratio-Opt
Brake Horsepower 335@5200
Rated Horsepower 57.8
Torque 425@3400
Main Bearings 5
Valve Lifters Hydraulic
Block Material
Engine Numbers
Engine No. Location Stamped on block pan rail at left rear corner below starter opening.
Lubrication Pressure to all bearings excluding wrist pin
Type Downdraft 4-barrel
Make Carter
Type Fully synchronized
Drive Rear wheel drive
No. Of Gears 4
Gear Ratios
1st 2.66 to 1
2nd 1.91
3rd 1.39
4th 1 to 1
5th Not applicable
Reverse 2.58
Single plate dry disc
Clutch Size 11 inches
Semifloating
Hypoid
Differential Ratio 3.23 to 1
Front Independent torsion bar
Rear Hotchkiss
Recirculating ball
Service Hydraulic, self-adjusting drums
Front Size 10 inches
Rear Size 10 inches
Emergency Rear service brakes
Size 10 inches
Exhaust System Dual
Ignition System Distributor and coil
Battery 12 volt storage battery
Cooling System Water pump
Radiator Tube and spacer
Fuel Type Premium
Mileage
Wheel Type
Wheel Mfr
Wheel Size
Tire Type
Tire Size F70 x 14
Spare Location Trunk
Fuel 19 Gallons
Oil 4 Quarts
Transmission 9 Pints
Cooling System 17 Quarts
Rear Differential 4 Pints
Front Differential Not applicable
Transfer Case Not applicable
Milestone Car
VIN/Serial no. Starting RM21G8a100001
VIN Description Total Digits: 13
Digits 1-2: Series
Digits 3-4: Body style
Digits 5: Engine
Digits 6: Model year
Digits 7: Assembly plant
Digits 8-13: Production number
VIN Location On plate on left front door body hinge pillar post.
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Additional Information

1968 Car & Equipment PricesDetroit Public Library (Nat'l Auto. Hist. Collctn)
5201 Woodward
Detroit MI 48202
(313) 833-1456
www.detroit.lib.mi.us/nahc/index.htm
The Plymouth Win-You-Over Beat Goes On (1968)Detroit Public Library (Nat'l Auto. Hist. Collctn)
1968 Road RunnerDetroit Public Library (Nat'l Auto. Hist. Collctn)
Standard Catalog of American Cars 1946-1975 Krause Pub.Los Angeles Public Library
630 West Fifth Street
Los Angeles CA 90071
(213) 228-7000
www.lapl.org
Serial No. Book for US Cars 1900-1975 G. BrighamHorseless Carriage Foundation
8186 Center St. Suite F P.O. Box 4119
La Mesa CA 91944-4119
(619) 464-0301
www.hcfi.org
Automotive Industries March 15 1968Detroit Public Library (Nat'l Auto. Hist. Collctn)
Paint Type
Colors All colors may not be available in all models.
Two Tone Colors Available
Forest Green Metallic
Mist Turquoise Metallic
Turbine Bronze #2 Metallic
Burgundy Metallic
Black
Buffed Silver Metallic
Mist Blue Metallic
Midnight Blue Metallic
Mist Green Metallic
Yellow Gold
Ember Gold Metallic
Surf Turquoise Metallic
Sunfire Yellow
Matador Red
Electric Blue Metallic
Avocado Metallic
Frost Blue Metallic
Sable White
Satin Beige
Sierra Tan Metallic
Medium Green Metallic
Standard/Optional Equipment
Torque Flite automatic transmissionOpt
383 cu. in. V8 engineOpt
426 cu. in. V8 engineOpt
Air conditioningOpt
Power brakesOpt
Power steeringOpt
RadioOpt
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