1973 Plymouth Road Runner GTX Engine Options and Specs
In 1973 the Plymouth Road Runner GTX only came with one engine.
For the 1973 Plymouth Road Runner GTX, the 440 High Performance 4 barrel engine was the only engine. No other engine options were available for the Road Runner GTX.
This article will include the 1973 Road Runner GTX 440 engine option and its specifications. This includes the engine code, cost, displacement, horsepower, torque, compression ratio, camshaft, lifter type, valve sizes, bore, stroke, air cleaner, exhaust, fuel and carburetion.
1973 Plymouth Road Runner GTX Engine Options and Specifications
The 1973 Road Runner GTX came with the following engine.
- 440 High Performance 4-barrel (Standard)
1973 Road Runner GTX With a 440 High Performance 4-barrel
The 440 High Performance 4-barrel was available for the 1973 Road Runner GTX. The engine’s horsepower and compression ratio remained the same but the torque slightly increased from the previous year.
The carburetor switched back to the Carter brand which provided a Thermo-quad for 1973.
The engine code was 86. Let’s take a look at the specifications.
| Specifications | 440 4-barrel |
| Displacement | 440 |
| Bore and Stroke | 4.32″ x 3.75″ |
| Horsepower (Net) | 280 @ 4,800 RPM |
| Torque (Net) | 380 @ 3,200 RPM |
| Compression Ratio | 8.2:1 |
| Camshaft | High lift, long duration, high overlap |
| Cam Duration/Overlap | 268°/284°/46° |
| Cam Lift | .450″/.464″ |
| Lifter Type | Hydraulic |
| Valve Diameter, Intake | 2.08″ |
| Valve Diameter, Exhaust | 1.74″ |
| Carburetion | Single Carter 4-bbl |
| Air Cleaner | Dual Snorkel |
| Exhaust System | Dual, low restriction |
| Fuel Recommended | Regular |
That’s the complete list of engines available for the 1973 Plymouth Road Runner GTX. If you have any questions to ask me about the engine options or specifications for the 1973 Road Runner GTX car model, send us an email found specifically on my contact page or comment below.
About 38 years ago I assembled my first Mopar engine, it was for a 1970 ‘Cuda. It’s at that time my hands on experience with Mopar cars and engines, including the 440, started. Although my research of the engines started years earlier.
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Article Resources
- 1973 Plymouth Service Manual
- 1973 Plymouth Satellite Dealer Brochure
- Google Books: Chrysler Engines 1922-1998
- Wikipedia: Plymouth GTX
