Plymouth Slant-6 Engine Specs

Bore, stroke, displacement and compression for all 13 Plymouth Slant-6 engines, compared side by side. Plus rod ratio and head specs where published.

At a glance

Displacement	170–225 ci
Cylinders	6
Bore	3.402"
Stroke	3.126–4.130"
Compression	8.2–8.4:1
Advertised power	90–145 hp
Years	1960–1987

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
LG	225 ci	3.4016" × 4.1299"	8.4:1	145
225 Slant 6	225 ci	3.4016" × 4.126"	8.4:1	145
C	225 ci	3.4016" × 4.1299"	—	110–145
Slant Six 1-bbl	225 ci	3.4016" × 4.1299"	—	145
225 Slant Six 1-bbl	225 ci	3.4016" × 4.1299"	—	100–145
Slant-6 (1960–1980)	225 ci	3.4016" × 4.1299"	—	90–145
1-bbl	225 ci	3.4016" × 4.1299"	—	95
Slant Six 225	225 ci	3.4016" × 4.1299"	—	95–110
RG	198 ci	3.4016" × 3.5591"	8.4:1	125
B	198 ci	3.4016" × 3.5591"	—	125
Slant-6 (1970–1974)	198 ci	3.4016" × 3.5591"	—	95–125
G	170 ci	3.4016" × 3.126"	8.2:1	101
Slant-6 (1960–1969)	170 ci	3.4016" × 3.126"	—	101–115

Factory cars with a Slant-6

• Dodge Dart: 1960, 145 hp; 1961, 145 hp; 1962, 145 hp; 1963, 101 hp; 1963, 145 hp; 1964, 101 hp; 1964, 145 hp; 1965, 101 hp; 1965, 145 hp; 1966, 101 hp; 1966, 145 hp; 1967, 115 hp; 1967, 145 hp; 1968, 115 hp; 1968, 145 hp; 1969, 115 hp; 1969, 145 hp; 1970, 125 hp; 1970, 145 hp; 1971, 125 hp; 1971, 145 hp; 1972, 100 hp; 1972, 110 hp; 1973, 95 hp; 1973, 105 hp; 1974, 95 hp; 1974, 105 hp; 1975, 95 hp; 1976, 100 hp
• Plymouth Valiant: 1960, 101 hp; 1961, 101 hp; 1961, 145 hp; 1962, 101 hp; 1962, 145 hp; 1963, 101 hp; 1963, 145 hp; 1964, 101 hp; 1964, 145 hp; 1965, 101 hp; 1965, 145 hp; 1966, 101 hp; 1966, 145 hp; 1967, 115 hp; 1967, 145 hp; 1968, 115 hp; 1968, 145 hp; 1969, 115 hp; 1969, 145 hp; 1970, 125 hp; 1970, 145 hp; 1971, 125 hp; 1971, 145 hp; 1972, 100 hp; 1972, 110 hp; 1973, 95 hp; 1973, 105 hp; 1974, 95 hp; 1974, 105 hp; 1975, 95 hp; 1976, 100 hp
• Dodge D-Series Pickup: 1962, 101 hp; 1962, 140 hp; 1963, 140 hp; 1964, 140 hp; 1965, 140 hp; 1966, 140 hp; 1967, 140 hp; 1970, 140 hp; 1971, 140 hp; 1972, 110 hp; 1973, 110 hp; 1974; 1975; 1976; 1977, 105 hp; 1978, 105 hp; 1979, 110 hp; 1980; 1981, 95 hp; 1982, 95 hp; 1983, 95 hp; 1984, 95 hp; 1985, 95 hp; 1986, 95 hp; 1987, 95 hp
• Plymouth Barracuda: 1964, 101 hp; 1964, 145 hp; 1965, 145 hp; 1966, 145 hp; 1967, 145 hp; 1968, 145 hp; 1969, 145 hp; 1970, 145 hp; 1971, 125 hp; 1971, 145 hp; 1972, 110 hp
• Dodge Coronet: 1965, 145 hp; 1966, 145 hp; 1967, 145 hp; 1968, 145 hp; 1969, 145 hp; 1970, 145 hp; 1971, 145 hp; 1972, 110 hp; 1973, 105 hp; 1974, 105 hp; 1975, 95 hp; 1976, 100 hp
• Dodge Charger: 1968, 145 hp; 1969, 145 hp; 1970, 145 hp; 1971, 145 hp; 1972, 110 hp; 1973, 105 hp; 1974, 105 hp; 1976, 100 hp
• Plymouth Satellite: 1968, 145 hp; 1969, 145 hp; 1970, 145 hp; 1971, 145 hp; 1972, 110 hp; 1973, 105 hp; 1974, 105 hp
• Dodge Challenger: 1970, 145 hp; 1971, 125 hp; 1971, 145 hp; 1972, 110 hp
• Plymouth Duster: 1970, 125 hp; 1970, 145 hp; 1971, 125 hp; 1971, 145 hp; 1972, 100 hp; 1972, 110 hp; 1973, 95 hp; 1973, 105 hp; 1974, 95 hp; 1974, 105 hp; 1975, 95 hp; 1976, 100 hp
• Dodge Ramcharger: 1975, 95 hp; 1976, 100 hp; 1977, 105 hp; 1978, 105 hp; 1979, 110 hp
• Plymouth Road Runner: 1979, 100 hp; 1980, 90 hp

What varies across the family

Every engine here shares a 3.4016" bore; displacement varies by stroke alone, which is the signature of a family built on one block with different cranks.

The family mixes oversquare and undersquare designs, so members behave quite differently despite sharing a name.

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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