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426 Cubic Inch HEMI V8 Engine

426 Cubic Inch HEMI V8 Engine
Above - 1970 426 HEMI Engine. Photo from the Chrysler archives.


Specifications: ( Based On 1970 Information )

Engine Type


Piston Displacement

426 cu. in.

Bore And Stroke

4.25" x 3.75"

Compression Ratio

10.1 to 1

Horsepower @ R.P.M.

425 @ 5000

Torque, lb-ft. @ R.P.M.

490 @ 4000

Fuel Recommendation


In 1966, Chrysler began offering a slightly tuned-down version of the 426 HEMI race engine (called the "street HEMI") as an option in Plymouth Belvederes, Dodge Coronets and Chargers. The cylinder head configuration with a nearly centrally located spark plug in a hemispherically shaped combustion chamber gave the classic HEMI engine its name.
This unique architecture has an inherent airflow that translates into big power. The street HEMI came with dual, four-barrel carburetors mounted on an aluminum dual-plan intake manifold. The engine's advertised horsepower and torque were 425 hp and 490 lb.-ft. of torque.
The street HEMI was optional on all years of the Dodge Coronet R/T. About 10,000 426 HEMIs were manufactured for street use in the engine's five-year run. Today, restored true HEMI cars command very high price tags.

Source Of Information: Chrysler Corporation


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