Mopar 383 vs 440: What's the Difference?

The Chrysler 383 B (low block), 1959-1971 and the Chrysler 440 RB (raised block), 1966-1978 differ in displacement, bore × stroke, compression ratio, factory rating. The table puts the factory specs side by side; each engine's own page has the full specs.

Specs side by side

	Chrysler 383 B (low block), 1959-1971	Chrysler 440 RB (raised block), 1966-1978
Engine	Chrysler 383 B (low block), 1959-1971	Chrysler 440 RB (raised block), 1966-1978
Displacement	383.0 ci (6.28 L)	439.7 ci (7.21 L)
Bore × stroke	4.250" × 3.375"	4.319" × 3.752"
Cylinders	8	8
Compression ratio	8.5:1–10:1	8.2:1–10.5:1
Factory rating	258 hp–340 hp	195 hp–390 hp
Block	cast iron	cast iron
Heads	cast iron	cast iron
Rod length	6.358"	6.768"
Deck height	9.980"	10.725"
Weight (approx.)	—	670 lb
Fuel	gas	gas
Model years	1960–1971	1966–1978

Where versions of an engine differ, the table shows the range across them. Ratings are the makers' published figures.

Which cars got each engine

Chrysler 383 B (low block), 1959-1971	Years
Chrysler 300	1962–1966
Chrysler Newport	1961–1971
Dodge D-Series Pickup	1967–1971
Dodge Charger	1966–1971
Dodge Coronet	1965–1971
Dodge Monaco	1965–1971
Dodge Polara	1960–1971
Dodge Dart	1961–1969
Dodge Challenger	1970–1971
Plymouth Fury	1960–1971
Plymouth Satellite	1965–1971
Plymouth Barracuda	1967–1971
Plymouth Road Runner	1968–1971

Chrysler 440 RB (raised block), 1966-1978	Years
Chrysler 300	1966–1971
Chrysler Imperial	1966–1975
Chrysler New Yorker	1966–1978
Chrysler Newport	1966–1978
Dodge Ramcharger	1974–1978
Dodge D-Series Pickup	1974–1978
Dodge Charger	1967–1974
Dodge Coronet	1967–1976
Dodge Monaco	1966–1978
Dodge Polara	1966–1973
Dodge Dart	1969
Dodge Ram Van / B-Series	1976–1978
Plymouth Road Runner	1969–1974
Dodge Challenger	1970–1971
Plymouth Fury	1966–1978
Plymouth GTX	1967–1971
Plymouth Barracuda	1969–1971

More

• Chrysler 383 B (low block), 1959-1971 specs
• Chrysler 440 RB (raised block), 1966-1978 specs
• All engine comparisons