1970 Plymouth GTX Engine Options and Specifications

In 1970 the Plymouth GTX could be ordered with three different high performance engine options.

For the 1970 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 1970 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.

1970 Plymouth GTX Engine Options and Specifications

1970 Plymouth GTX.
1970 Plymouth GTX

The 1970 GTX was available with the following three engines.

  • 440 High Performance 4-barrel (Standard)
  • 440 6-barrel (Optional)
  • 426 Hemi (Optional)

1970 GTX With a 440 High Performance 4-barrel

The 440 High Performance 4-barrel was available as the standard engine for the 1970 GTX. The compression ratio decreased from 10.1:1 to 9.7:1 from the previous year.

The engine code was E86. Let’s take a look at the specifications.

Specifications440 4-barrel
Displacement440
Bore and Stroke4.32″ x 3.75″
Horsepower375 @ 4,600 RPM
Torque480 @ 3,200 RPM
Compression Ratio9.7:1
CamshaftHigh lift, long duration, high overlap
Cam Duration/Overlap268°/284°/46°
Cam Lift.450″/.458″
Lifter TypeHydraulic
Valve Diameter, Intake2.08″
Valve Diameter, Exhaust1.74″
CarburetionSingle Carter 4-bbl
Air CleanerDual Snorkel
Exhaust SystemDual, low restriction
Fuel RecommendedPremium
1970 Plymouth GTX 440 4 barrel High Performance Specifications.

1970 GTX With a 440 6-barrel

A 440 Six Barrel engine inside a 1970 Plymouth GTX.
A 440 Six Barrel engine inside a 1970 Plymouth GTX

The 440 Six Barrel was available for the first time as an option for the 1970 GTX. The engine code was E87 and cost an extra $119.05. Let’s take a look at the specifications.

Specifications440 Six Barrel
Displacement440
Bore and Stroke4.32″ x 3.75″
Horsepower390 @ 4,700 RPM
Torque490 @ 3,200 RPM
Compression Ratio10.5:1
CamshaftHigh lift, long duration, high overlap
Cam Duration/Overlap268°/284°/46°
Cam Lift.450″/.458″
Lifter TypeHydraulic
Valve Diameter, Intake2.08″
Valve Diameter, Exhaust1.74″
CarburetionTriple Holley 2-bbl
Air CleanerUnsilenced
Exhaust SystemDual, low restriction
Fuel RecommendedPremium
1970 Plymouth GTX 440 Six Barrel High Performance Specifications.

1970 GTX With a 426 Hemi

The 426 Hemi was available as an option for the 1970 GTX. The camshaft was once again changed from the previous year using hydraulic tappets instead of mechanical. The lift and duration remained the same.

The engine code was E74 and cost an extra $710.60. Let’s take a look at the specifications.

Specifications426 Hemi
Displacement426
Bore and Stroke4.25″ x 3.75″
Horsepower425 @ 5,000 RPM
Torque490 @ 4,000 RPM
Compression Ratio10.25:1
CamshaftHigh lift, long duration, high overlap
Cam Duration/Overlap284°/284°/60°
Cam Lift.490″/.481″
Lifter TypeHydraulic
Valve Diameter, Intake2.25″
Valve Diameter, Exhaust1.94″
CarburetionDual Carter 4-bbl
Air CleanerUnsilenced
Exhaust SystemDual, low restriction
Fuel RecommendedPremium
1970 Plymouth GTX 426 Hemi Dual 4 barrel Specifications.

That’s the complete list of engines available for the 1970 Plymouth GTX. If you have any questions to ask me about the engine options or specifications for the 1970 GTX car model, send us an email found specifically on my contact page or comment below.

1970 Plymouth GTX with a 440 High Performance engine.
1970 Plymouth GTX with a 440 High Performance engine

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.

Kevin Garce video about the 440 Six Barrel engine’s little known facts.

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