1971 Plymouth GTX Engine Options and Specifications
In 1971 the Plymouth GTX could be ordered with three different high performance engine options.
For the 1971 GTX, the 440 High Performance 4 barrel engine was the standard engine. Two engine options were available including the 440 6 barrel and the 426 Hemi.
This article will include the 1971 GTX engine options and their 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.
1971 Plymouth GTX Engine Options and Specifications
The 1971 GTX was available with the following three engines.
- 440 High Performance 4-barrel (Standard)
- 440 6-barrel (Optional)
- 426 Hemi (Optional)
In 1971 manufacturers began rating horsepower and torque with gross and net ratings.
1971 GTX With a 440 High Performance 4-barrel
The 440 High Performance 4-barrel was available as the standard engine for the 1971 GTX.
The gross horsepower decreased from 375 to 370 compared to the previous year.
The engine code was E86 although it did not need to be ordered. Let’s take a look at the specifications.
| Specifications | 440 4-barrel |
| Displacement | 440 |
| Bore and Stroke | 4.32″ x 3.75″ |
| Horsepower (Gross) Horsepower (Net) | 370 @ 4,600 RPM 305 @ 4,600 RPM |
| Torque (Gross) Torque (Net) | 480 @ 3,200 RPM 400 @ 3,200 RPM |
| Compression Ratio | 9.7:1 |
| Camshaft | High lift, long duration, high overlap |
| Cam Duration/Overlap | 268°/284°/46° |
| Cam Lift | .450″/.458″ |
| 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 | Premium |
1971 GTX With a 440 6-barrel
The 440 Six Barrel was available as an option for the 1971 GTX. From the previous year the gross horsepower decreased from 390 to 385 and the compression ratio from 10.5:1 to 10.3:1.
The engine code was E87 and cost an extra $125.00. Let’s take a look at the specifications.
| Specifications | 440 Six Barrel |
| Displacement | 440 |
| Bore and Stroke | 4.32″ x 3.75″ |
| Horsepower (Gross) Horsepower (Net) | 385 @ 4,700 RPM 330 @ 4,700 RPM |
| Torque (Gross) Torque (Net) | 490 @ 3,200 RPM 410 @ 3,200 RPM |
| Compression Ratio | 10.3:1 |
| Camshaft | High lift, long duration, high overlap |
| Cam Duration/Overlap | 268°/284°/46° |
| Cam Lift | .450″/.458″ |
| Lifter Type | Hydraulic |
| Valve Diameter, Intake | 2.08″ |
| Valve Diameter, Exhaust | 1.74″ |
| Carburetion | Triple Holley 2-bbl |
| Air Cleaner | Unsilenced |
| Exhaust System | Dual, low restriction |
| Fuel Recommended | Premium |
1971 GTX With a 426 Hemi
The 426 Hemi was available as an option for the 1971 GTX. The Hemi was the only engine in 1971 which did not see a decrease in horsepower or compression ratio.
The engine code was E74 and cost an extra $746.50. Let’s take a look at the specifications.
| Specifications | 426 Hemi |
| Displacement | 426 |
| Bore and Stroke | 4.25″ x 3.75″ |
| Horsepower (Gross) Horsepower (Net) | 425 @ 5,000 RPM 350 @ 5,000 RPM |
| Torque (Gross) Torque (Net) | 490 @ 4,000 RPM 390 @ 4,000 RPM |
| Compression Ratio | 10.25:1 |
| Camshaft | High lift, long duration, high overlap |
| Cam Duration/Overlap | 284°/284°/60° |
| Cam Lift | .490″/.481″ |
| Lifter Type | Hydraulic |
| Valve Diameter, Intake | 2.25″ |
| Valve Diameter, Exhaust | 1.94″ |
| Carburetion | Dual Carter 4-bbl |
| Air Cleaner | Unsilenced |
| Exhaust System | Dual, low restriction |
| Fuel Recommended | Premium |
That’s the complete list of engines available for the 1971 Plymouth GTX. If you have any questions to ask me about the engine options or specifications for the 1971 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
- 1971 Plymouth Service Manual
- Google Books: Chrysler Engines 1922-1998
- Wikipedia: Plymouth GTX
