Dodge 426ci Specs: 4.25 x 3.75 in

Dodge 426ci specs: 4.25 x 3.75 in (108 x 95.3 mm) bore and stroke, shared by all 7 versions. Displacement, compression and factory ratings, plus rod ratio.

At a glance

Displacement	426 ci
Cylinders	8
Bore	4.250"
Stroke	3.750"
Advertised power	365–425 hp
Years	1964–1971

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
R	426 ci	4.25" × 3.75"	—	425
426 Street Hemi, dual 4-bbl	426 ci	4.25" × 3.75"	—	425
426 Hemi 2x4-bbl	426 ci	4.25" × 3.75"	—	425
426 Hemi, dual 4-bbl	426 ci	4.25" × 3.75"	—	425
Dodge 426ci (1965–1970)	426 ci	4.25" × 3.75"	—	365–425
Street Hemi	426 ci	4.25" × 3.75"	—	425
High Performance Package	426 ci	4.25" × 3.75"	—	365

Factory cars with a Dodge 426ci

• Dodge D-Series Pickup: 1964, 365 hp; 1965, 365 hp; 1966, 365 hp
• Dodge Coronet: 1965, 365 hp; 1966, 425 hp; 1967, 425 hp; 1968, 425 hp; 1969, 425 hp; 1970, 425 hp
• Dodge Charger: 1966, 425 hp; 1967, 425 hp; 1968, 425 hp; 1969, 425 hp; 1970, 425 hp; 1971, 425 hp
• Dodge Challenger: 1970, 425 hp; 1971, 425 hp

What varies across the family

All are oversquare — bore larger than stroke, which favours revs over low-end torque.

Each engine page carries rod ratio, mean piston speed, bore/stroke character and cylinder head specs where published, and links into the calculators with its dimensions already filled in.

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