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Street SuperBird Specifications
By Ken
R. Noffsinger
1970 PLYMOUTH ROAD RUNNER SUPERBIRD
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"Completion of dealer survey by ACCUSFIA covering the Plymouth
SuperBird indicates that Chrysler Plymouth has complied with the production
requirements established for 1970 stock car racing. The Plymouth SuperBird
as delivered to dealers is therefore eligible for competition as of this
date."
An excerpt from the Automobile Competition Committee for
the United States' telegram officially notifying Chrysler on
January 14, 1970 that they had produced and delivered a
sufficient number of SuperBirds to make them eligible
for competition.
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GENERAL DATA
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Frame Type |
Unitized Body And Frame |
Overall Length (in.) |
221.0 |
Overall Width (in.) |
76.4 |
Overall Height (in.) |
61.4 |
Wheelbase (in.) |
115.8 |
Tread, Front (in.) |
59.7 |
Tread, Rear (in.) |
58.7 |
Fuel Capacity (gal.) |
19 |
Height Of Wing Above Deck Lid (in.) |
24 |
Ground Clearance (in.) |
7.2 |
Weight Balance, Front/Rear (%) |
54/46 |
Shipping Weight (lbs.) |
3,785 |
Manufacturer's Suggested Retail
Price ($) (as of September 23, 1969) |
4,298.00 |
First Car Produced |
Oct. 22, 1969 |
Last Car Produced |
Dec. 15, 1969 |
0-60 MPH Time (sec.)
(Estimated by Road Test magazine, April, 1970) |
5.5 |
Quarter-Mile Performance (sec./MPH)
(Road Test magazine, April, 1970) |
14.26/103.7 |
Top Speed (MPH) |
130-160 |
Current Value ($) |
440 4-bbl: 30,000 440
6-bbl: 40,000 426 8-bbl: 65,000 |
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Where specifications vary depending upon standard or optional equipment,
those found here are for a SuperBird with standard equipment only (except
for top speed estimates).
The front fenders and hood were modified 1970 Coronet pieces. The front
fender scoops were made of injected plastic and mounted via five studs. There
were two distinct shapes to the scoops - a flat type and a much more rounded one.
A car may have come from the factory with two of the same style or one of
each.
All cars came equipped with Boar Grain vinyl roofs. The rear window
was never tinted, even if the rest of the glass in the car was. No
convertible SuperBirds are known to have been produced by the factory.
The nose was made of steel; the headlight buckets of fiberglass. The
wing was aluminum, and the pitch of the horizontal portion was adjustable.
The nose and wing were painted with lacquer; the remainder of the body was
painted with acrylic enamel.
Top speed for the SuperBird as factory equipped is difficult to estimate.
Terminal speeds of 130 to 150 MPH would seem reasonable, depending upon, among
other things, the engine in the car. All SuperBirds came with 150 MPH
speedometers.
Jim Fredericks' SuperBird, "Fly Rod", exceeded 216 MPH in the B/Production
class at the Bonneville Salt Flats in the late 1980's. This made it the
world's fastest production (gasoline fueled, normally aspirated) winged
car.
As with top speed, current value is very difficult to estimate. Figures
shown here are for automatic transmission, well documented, correctly
date-coded, numbers matching cars in very good condition with few
reproduction (non-original equipment manufacturer) items. Add 10% for four
speed cars.
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VEHICLE IDENTIFICATION NUMBER (VIN) RM23?0A1?????
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Series: Mid-size |
R |
Price Class: Road Runner |
M |
Number Of Doors |
2 |
Body Type: Hardtop |
3 |
Engine |
U=440 4V V=440 6V R=426 8V |
Last Digit Of Model Year: 1970 |
0 |
Assembly Plant: Lynch Road |
A |
Assembly Plant Sequential Number Range |
149789 to 181274 |
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Vehicle serial numbers (or Vehicle Identification Numbers - VINs) are
found on the driver's side of the car on (1) the upper portion of the dash
pad at the base of the windshield and (2) the fender tag on the
inner fender in the engine compartment. The
SuperBird Fender Tag Decoding page provides
instruction on analyzing SuperBird fender tags where the VIN, as well as
other important information, are found. VINs may also be found on the top or
rear face of the radiator upper yolk and/or the driver's side rear deck
trunk lip.
The Assembly Plant Sequential Number begins at 100001 each production
year. SuperBird assembly numbers appear sporadically throughout the stated
range.
Broadcast Sheets are also a wealth of information and can sometimes be
found in the car in one of these locations: on the backside of the glove box;
under or behind the front seats or rear seats; under the carpeting.
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ENGINE
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440 Super
Commando (standard) |
440 Six-Barrel
(optional) |
426 Hemi
(optional) |
Block |
Cast Iron 90
Degree V-8 |
Cylinder Bore (in.) |
4.32 |
4.25 |
Cylinder Stroke (in.) |
3.75 |
Displacement (cu. in.) |
439.7 |
439.7 |
425.6 |
Carburetion |
1 4-bbl |
3 2-bbl |
2 4-bbl |
Carburetor Maker |
Carter |
Holley |
Carter |
Carburetor Model |
AVS |
2300 |
AFB |
Compression Ratio |
9.7:1 |
10.5:1 |
10.25:1 |
Camshaft |
High Lift,
Long Duration, High Overlap |
Camshaft Duration,
Intake/Exhaust/Overlap (degrees) |
276/292/54 |
292/292/68 |
Lifter Type |
Hydraulic |
Valve Diameter, Intake (in.) |
2.08 |
2.25 |
Valve Diameter, Exhaust (in.) |
1.74 |
1.94 |
Distributor |
Aluminum, Single Breaker |
Prestolite, Cast
Iron, Dual Breaker |
Air Induction |
Under Hood |
Exhaust System |
Dual, Low Restriction,
Cast Iron Headers, 2.5 in. Diameter Pipes Into High Flow Mufflers |
Brake Horsepower |
375 |
390 |
425 |
RPM at Max. Horsepower |
4,600 |
4,700 |
5,000 |
Torque (ft.-lb.) |
480 |
490 |
RPM at Max. Torque |
3,200 |
4,000 |
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The exhaust pipes just back from the cast iron headers were in an "H"
configuration - left and right pipes were joined together by an additional
short section of pipe. In addition, Hemi cars sported resonator
canisters, mounted just prior to where the pipes exited under the rear of
the car. Most SuperBirds came with chrome exhaust tips. A few cars, and
all California cars, came with down-turned exhaust pipes in the rear.
440 4-bbl SuperBirds carried the same Chrysler Corporation warranty as other
Road Runner models. When equipped with either the 440 Six-Barrel or 426 Hemi
options, they carried the restricted warranty of 12 months or 12,000 miles as
offered on other high performance vehicles.
Production numbers vary somewhat, depending on the source. According to the
Plymouth SuperBird NASCAR Race Program Serial Number List, 1,162 cars were
produced with the 440 4-bbl. Another 665 carried the 440 6-bbl, and the remaining
93 were powered by the 426 Hemi. These figures add to a total of 1,920 cars
produced. This list has some notable errors in it; those with a copy of it
may wish to review the VIN Numbers page which
explains some of the discrepancies found in the list.
Cars with original engine blocks will have the last eight digits of the
SuperBird's Vehicle Identification Number (VIN) stamped on a pad on the lower
right (passenger) side of the block, near the oil pan.
There were no external markings on the SuperBird identifying the type of
engine.
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TRANSMISSION/ REAR AXLE
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727 TorqueFlite
Automatic (standard) |
A833 Four Speed
Manual (18 Spline) (optional) |
Transmission Ratios |
2.45(first) 1.45(second) 1.00 (third) 2.20(reverse) |
2.65(first) 1.93(second) 1.39(third) 1.00(fourth) 2.57(reverse) |
Transmission Package |
Performance Axle Package Standard |
Trak Pak Standard |
Rear Axle Type |
Semi-Floating
Hypoid "Sure Grip" |
Rear Axle Ratio/Ring Gear Diameter
(in.) |
3.55:1/8.75 (Chrysler) |
3.54:1/9.75 (Dana 60) |
Driveshaft Diameter (in.) |
3.25 |
Driveshaft Length (in.) |
51.50 |
50.39 |
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Various sources report the following transmission break-out for 440
Six-Barrel and 426 Hemi cars:
440 6-bbl 408 Automatics
440 6-bbl 308 Four Speeds
426 8-bbl 77 Automatics
426 8-bbl 58 Four Speeds
440 4-bbl 618 Automatics
440 4-bbl 466 Four Speeds
This adds to a total of 1,935 SuperBirds, Chrysler Historical Society's
"official" number and one of the other frequently quoted total production
numbers (like the 1,920 discussed in the Engine section above). In the case
of 4-bbl and 6-bbl engines, four speed cars comprise 43% of the total in
each. Using this percentage, and applying it against 1,084 440 4-bbls
(this count of 440 4-bbl cars is associated with the 1,935 total production
figure) provides the break-out for 440 4-bbls shown above. More information
on the topic of total production is available in the
Where Are They Now? page.
Cars with original transmission cases will have the last eight digits of
the Vehicle Identification Number (VIN) stamped on a pad on the right
(passenger) side of the transmission case.
Automatic transmission cars either had a column mounted shifter or
one on the floor as part of a console (a small round shifter knob was used
in this case). Four speed SuperBirds came with floor mounted shifters only,
with and without consoles. The non-console equipped cars had a long Hurst
pistol grip type shifter, while the console cars had a much shorter pistol
grip assembly.
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SUSPENSION/ BRAKES
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Suspension, Front |
Independent, Lateral,
Non-Parallel Control Arms With Ball Joints And Torsion Bars |
Torsion Bar Diameter (in.) |
.92 |
Torsion Bar Length, (in.) |
41 |
Rate At Front Wheel (lbs./in.) |
124 |
Shock Absorbers |
Extra Heavy Duty, Tubular,
Hydraulic-Telescoping |
Sway Bar Diameter, Front (in.) |
.88 |
Suspension, Right Rear |
Extra Heavy Duty,
Semi-Elliptical Springs, 5 Leaves Plus 2 Half Leafs |
Suspension, Left Rear |
Extra Heavy Duty,
Semi-Elliptical Springs, 6 Leaves |
Rate At Rear Wheel (lbs./in.) |
148 |
Brakes, Front |
Kelsey-Hayes
10.97 in. x 6.98 in. Vented Disc, Floating Caliper |
Brakes, Rear |
10 in.x 2.5 in. Drum |
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Shock absorbers were the double acting type, mounted with rubber
bushings.
The asymmetrical rear springs were 58 in. in length and 2.5 in. in
width, outboard-mounted, with pivot rubber bushings in the front and shackle
rubber bushings in the rear.
The braking system used a dual master cylinder - one system for the
front; another for the rear. Front power disc brakes came standard on all
SuperBirds. Rear brakes were self-adjusting, servo contact, self-energizing
with bonded linings. Brake shoes were the internal expanding type, and
there was a separate mechanical parking brake.
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EXTERIOR COLOR
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Color |
Percentage Of Total |
Alpine White |
17% |
Blue Fire Metallic |
14% |
Corporation (Petty) Blue |
5% |
Lemon Twist Yellow |
23% |
Limelight Green |
11% |
Tor Red |
14% |
Vitamin C Orange |
16% |
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No records were kept by Chrysler as to the number of SuperBirds produced
by color. Galen Govier maintains a huge registry for SuperBirds, and
based on his sample of cars and their colors, a reasonable estimation of
car color as a percentage of total production can be arrived at. The
percentage values presented in the table were calculated in this way.
Colors listed in the more darkly shaded blocks were special order,
extra cost colors. Of these extra cost colors, all but Corporation Blue
were sometimes referred to as "High Impact" colors.
At least one car has been documented as having been painted Deep Burnt
Orange Metallic by the factory, even though this color was not advertised
as available for the SuperBird.
The rear quarter panel decal "Plymouth" was normally white on blue and red
cars, while black decals were found on green, orange, white and yellow cars.
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INTERIOR
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Standard |
Optional |
Seats |
Black Bench Seats |
Black Bucket Seats |
White Bench Seats |
White Bucket Seats |
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All seats were made of vinyl material. Black bucket seats had a charcoal
bolster.
The carpet, instrument panel and shelf panel, steering wheel and
headlining were always black.
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TIRES/WHEELS
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Standard |
Optional |
Tires |
F70x14 in. White Sidewall Tires |
F60x15 in. Raised White Letter
Tires, Polyglas GT |
F70x14 in. Raised White Letter Tires, Polyglas |
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Wheels |
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14x5.5 in. Magnum 500 |
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14x6.0 in. Rallye |
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14x6.0 in. Stamped Steel |
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15x7.0 in. Rallye |
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15x7.0 in. Stamped Steel |
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All tires were of bias ply design and made by Goodyear.
The vast majority of cars appear to have come with 15x7.0 in. Rallye or
14x5.5 in. Magnum 500 wheels. Some F60x15 in. Polyglas GT tires did not
have had the size indicated in raised white letters.
The spare tire always came with a stamped steel wheel, which would
typically be body color. All
SuperBirds had two jacks. This was necessary because the car did not
have a standard front bumper, therefore a scissor type jack was
necessary to raise the front of the car.
1970 was the last year for left hand lug nuts (fortunately).
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STANDARD/ OPTIONAL EQUIPMENT
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Standard Equipment |
3.54:1 Sure-Grip 9.75 in. Axle
With Four Speed |
3.55:1 Sure-Grip 8.75 in. Axle
With Automatic |
3-Speed Wipers With Electric
Washers |
70-amp HD Battery |
Carpeting |
Cigar Lighter |
Delete Transverse Tape Stripe,
Add "Road Runner" |
Drip Rail Mouldings |
Dual Exhaust System |
F70x14 in. White Sidewall
Tires |
F70x14 in. Raised White Letter
Tires Polyglas |
Firm Ride Shock Absorbers |
Four Barrel 375-hp V-8 Engine,
440 Super Commando |
Front Disc Brakes |
Front Heater |
Front Sway Bar |
Glove Box Lock |
Heater Controls Lamp |
Hemi Suspension |
Hood Pins |
Hub Caps |
Inside Day/Night Rear View Mirror |
Lower Half Horn Ring Steering
Wheel |
Maximum Cooling Package |
No Radio |
Oil Pressure Gauge |
Outside Left Hand Manual Chrome Mirror |
Performance Axle Package |
Power Brakes |
Power Steering |
Road Runner "Beep-Beep" Horn |
Special Order Black Vinyl Roof |
Sure Grip Differential |
Torque Drive Fan |
TorqueFlite Automatic
Transmission |
Track Pak |
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Optional Equipment |
14x6.0 in. Rallye Wheels |
15x7.0 in. Rallye Wheels |
14x5.5 in. Road Wheels Magnum
500 |
2 Spoke Rim Blow Steering Wheel |
Accessory Floor Mats |
Air Foam Bench Seat Cushion |
AM Radio |
AM/FM Radio |
AM Radio With Stereo 8-Track
Player |
Body Belt Mouldings |
Bright Exhaust Trumpets With
Low Restriction Tail Pipes |
Bucket Seats |
Center Front Cushion With
Folding Arm Rest |
Chrome Exhaust Tips |
Console With Lock and Key |
Custom Sill |
Deluxe Seat Belts |
Door Edge Mouldings |
Dual Four Barrel 425-hp V-8
Engine, 426 Hemi |
Electric Clock |
Engine Block Heater |
Evaporative Emission Control
(required in California) |
F60x15 in. Raised White Letter
Tires Polyglas GT |
Four-Speed Manual Transmission |
High Impact Paint |
Left Hand Six-Way Adjustable Bucket
Seat |
Noise Reduction Package
(required in California) |
Outside Left Hand Remote Chrome Mirror |
Outside Right Hand Manual Chrome
Mirror |
Pedal Dress-Up |
Power Windows |
Rear Arm Rests |
Rear Bumper Guards |
Rear Window Defogger |
Shoulder Belts - Rear |
Tachometer With Clock |
Three-Two Barrel 390-hp V-8
Engine, 440 Six Barrel |
Tinted Glass All |
Tinted Windshield Only |
Under Coating With Hood Pad |
Woodgrain Sports Steering Wheel |
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Not Available
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Road Runner equipment not available when the A13 SuperBird package was
ordered were: 14 in. Deluxe Wheel Covers, 14 in. Wire Wheel Covers, Air
Conditioning, Air Grabber Hood, All Windows - Clear, Automatic Speed Control,
Axle Packages (A31, A32 and A34), Basic Group, Body Sill Mouldings, 11 in.
Heavy Duty Brakes, Headlight Delay, Hood Performance Paint Treatment, Light
Package, Rear Speaker, Road Runner Dust Trail Stripe, Trailer Towing Package
and Woodgrain Instrument Panel.
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Information found here, unless otherwise noted, is intended to describe
"typical" SuperBirds as equipped by the factory and advertised by Chrysler.
No attempt has been made to document all possible equipment or features
(including dealer installed items such as air conditioning) that may be
found on as few as one SuperBird. Information to that degree of detail is
available from expert sources such as
Galen Govier,
who maintains a very sizeable registry for the cars.
The following sources were consulted while compiling this page:
- By The Numbers by Galen V. Govier in Mopar Muscle, December/January,
1992.
- Chrysler Corporation Part & Casting Numbers Book, 1962 - 1974, Sixth
Printing, January, 1996 by Galen V. Govier.
- Chrysler-Plymouth Special Parts and Maintenance Schedule for Road
Runner SuperBird, prepared by the Technical Services Department of the
Chrysler-Plymouth Division of Chrysler Corporation (not dated) and reprinted by
the Daytona-SuperBird Auto Club.
- Databook & Price Guide, Road Runner/GTX 1967 - 1980, compiled by R.
Perry Zavitz, 1986.
- David J. Patik.
- Galen V. Govier.
- Mopar's Mightiest Powers This Winged Road Runner Hemi SuperBird by
Bob Stevens in Muscle Cars of the '60s/'70s, July/August, 1991.
- 1970 Belvedere Code List in Chrysler Quarterly, Winter, 1989.
- 1970 Plymouth Road Runner SuperBird Judging Form: 1993 by Dave
Patik, 1993.
- 1970 Plymouth Service Manual - Belvedere, Fury, Barracuda,
Valiant, prepared by the Chrysler-Plymouth Division of Chrysler
Corporation (1969) and reprinted by Year One, Inc.
- Plymouth SuperBird NASCAR Race Program Serial Number List,
prepared by Product Planning Technical Services Fleet Engineering, Chrysler
Corporation (not dated) and reprinted by the Daytona-SuperBird Auto Club.
- Quicksilver Supercar Series: MOPAR - Dodge & Plymouth, The Performance
Years by Martin L. Schorr, 1982.
- Reason Enough - SuperBird, the Ultimate Road Runner by Jason Scott in
MuscleCar Review, August, 1992.
- Roadrunner, A Source Book, edited and annotated by Samuel A. Shields,
Jr., 1983.
- 1970 Plymouth SuperBird: Truly a super 'Bird - Road Test Review by Tony
Grey in Muscle Cars of the '60s/'70s, March/April, 1992.
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