Dodge Diplomat Engines by Year

The Diplomat was Dodge's mid-size M-body sedan, sold for 1977–1989 and best known as a police car. It used the 225 Slant Six and the 318 and 360 V8s. The Plymouth Gran Fury and Chrysler Fifth Avenue were its twins.

Pick a year to see every engine offered that model year, with its code, rated horsepower and the trims it came in. Each engine links to its full specs.

Jump to a year

1977–1979: 1977 · 1978 · 1979

1980–1989: 1980 · 1981 · 1982 · 1983 · 1984 · 1985 · 1986 · 1987 · 1988 · 1989

1977–1979

The Slant Six, 318 and 360.

1977 Diplomat engines

Engine	Rated	Offered in
5.2L / 318 V8 LA 318 2-bbl, Electronic Lean Burn	145 hp net	All (standard)

1978 Diplomat engines

Engine	Rated	Offered in
3.7L / 225 slant six Super Six 2-bbl	110 hp net	Optional
5.2L / 318 V8 LA 318 2-bbl	140 hp net	Standard V8
5.9L / 360 V8 LA 360 2-bbl	155 hp net	Optional

1979 Diplomat engines

Engine	Rated	Offered in
3.7L / 225 slant six Slant Six 2-bbl	—	Optional
3.7L / 225 slant six Slant Six 1-bbl	100 hp net	Base
5.2L / 318 V8 LA 318 2-bbl	135 hp net	Optional
5.9L / 360 V8 LA 360 4-bbl HD, dual exhaust	—	Optional
5.9L / 360 V8 LA 360 2-bbl	150 hp net	Optional

1980–1989

The Slant Six and 318.

1980 Diplomat engines

Engine	Rated	Offered in
3.7L / 225 slant six Slant Six 1-bbl	90 hp net	Base
5.2L / 318 V8 LA 318 2-bbl	—	Optional

1981 Diplomat engines

Engine	Rated	Offered in
3.7L / 225 slant six Slant Six 1-bbl	85 hp net	Base
5.2L / 318 V8 LA 318 2-bbl	130 hp net	Optional (Federal)
5.2L / 318 V8 LA 318 4-bbl	165 hp net	California; police

1982 Diplomat engines

Engine	Rated	Offered in
3.7L / 225 slant six Slant Six 1-bbl	90 hp net	Base
5.2L / 318 V8 LA 318 2-bbl	130 hp net	Optional (Federal)
5.2L / 318 V8 LA 318 4-bbl	165 hp net	California; police package

1983 Diplomat engines

Engine	Rated	Offered in
3.7L / 225 slant six Slant Six 1-bbl	90 hp net	Base
5.2L / 318 V8 LA 318 2-bbl	130 hp net	Optional
5.2L / 318 V8 LA 318 4-bbl	165 hp net	Police package

1984 Diplomat engines

Engine	Rated	Offered in
5.2L / 318 V8 LA 318 2-bbl	130 hp net	All (standard)
5.2L / 318 V8 LA 318 4-bbl	165 hp net	Police package

1985 Diplomat engines

Engine	Rated	Offered in
5.2L / 318 V8 LA 318 2-bbl	140 hp net	All (standard)
5.2L / 318 V8 LA 318 4-bbl	175 hp net	Police package

1986 Diplomat engines

Engine	Rated	Offered in
5.2L / 318 V8 LA 318 2-bbl	140 hp net	All (standard)
5.2L / 318 V8 LA 318 4-bbl	175 hp net	Police package

1987 Diplomat engines

Engine	Rated	Offered in
5.2L / 318 V8 LA 318 2-bbl	140 hp net	All (standard)
5.2L / 318 V8 LA 318 4-bbl	175 hp net	Police package

1988 Diplomat engines

Engine	Rated	Offered in
5.2L / 318 V8 LA 318 2-bbl	140 hp net	All (standard)
5.2L / 318 V8 LA 318 4-bbl	175 hp net	Police package

1989 Diplomat engines

Engine	Rated	Offered in
5.2L / 318 V8 LA 318 2-bbl	140 hp net	All (standard)
5.2L / 318 V8 LA 318 4-bbl	175 hp net	Police package

Working on one of these engines?

• Engine displacement from bore and stroke
• Static and dynamic compression ratio
• Which camshaft for your build
• What size carburetor
• Horsepower to torque at any RPM
• Torque converter stall speed

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