Plymouth B Engine Specs

Bore, stroke, displacement and compression for all 27 Plymouth B engines, compared side by side. Plus rod ratio and head specs where published.

At a glance

Displacement	350–400 ci
Cylinders	8
Bore	4.063–4.342"
Stroke	3.375"
Compression	8.2–10.0:1
Advertised power	165–335 hp
Years	1958–1978

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
B · 4.342" × 3.375" · 8.2:1	400 ci	4.342" × 3.375"	8.2:1	190–255
400 2-bbl	400 ci	4.342" × 3.375"	—	165–175
400 4-bbl dual exhaust	400 ci	4.342" × 3.375"	—	240–260
400 4-bbl single exhaust	400 ci	4.342" × 3.375"	—	205
400 4-bbl Lean Burn	400 ci	4.342" × 3.375"	—	190
B (1973–1978)	400 ci	4.342" × 3.375"	—	175–260
B 400	400 ci	4.342" × 3.375"	—	165–190
E68	400 ci	4.342" × 3.375"	—	235–260
383 2BBL	383 ci	4.25" × 3.375"	9.2:1	270
E	383 ci	4.25" × 3.375"	10:1	330–335
383 B 2bbl	383 ci	4.25" × 3.375"	—	305
383 B 4bbl	383 ci	4.25" × 3.375"	—	315–325
L	383 ci	4.25" × 3.375"	—	275–290
N	383 ci	4.25" × 3.375"	—	300–335
383 4-bbl	383 ci	4.25" × 3.375"	—	325–330
383 2-bbl	383 ci	4.25" × 3.375"	—	270–290
383 Magnum 4-bbl	383 ci	4.25" × 3.375"	—	300
B (1965–1971)	383 ci	4.25" × 3.375"	—	270–335
Super Bee std	383 ci	4.25" × 3.375"	—	335
2-bbl	383 ci	4.25" × 3.375"	—	200–258
B	361 ci	4.125" × 3.375"	9:1	250
361 2-bbl	361 ci	4.125" × 3.375"	—	265
D-500	361 ci	4.125" × 3.375"	—	305–330
Super D-500	361 ci	4.125" × 3.375"	—	320
EFI	361 ci	4.125" × 3.375"	—	333
B (1962–1966)	361 ci	4.125" × 3.375"	—	265–305
1958 350 295HP	350 ci	4.0625" × 3.375"	10:1	295

Factory cars with a B

• Dodge Coronet: 1958, 295 hp; 1958, 305 hp; 1958, 320 hp; 1958, EFI, 333 hp; 1965, 265 hp; 1965, 330 hp; 1966, 265 hp; 1966, 325 hp; 1967, 270 hp; 1967, 325 hp; 1968, 290 hp; 1968, 330 hp; 1968, 335 hp; 1969, 290 hp; 1969, 330 hp; 1969, 335 hp; 1970, 290 hp; 1970, 330 hp; 1970, 335 hp; 1971, 275 hp; 1971, 300 hp; 1972, 190 hp; 1972, 255 hp; 1973, 175 hp; 1973, 260 hp; 1974, 205 hp; 1975, 190 hp; 1976, 175 hp; 1976, 210 hp; 1976, 240 hp
• Dodge Dart: 1960, 310 hp; 1961, 305 hp; 1961, 330 hp; 1962, 305 hp; 1967, 280 hp; 1968, 300 hp; 1969, 330 hp
• Chrysler 300: 1962, 305 hp; 1963, 305 hp; 1964, 305 hp; 1965, 315 hp; 1966, 325 hp
• Plymouth Satellite: 1965, 265 hp; 1965, 330 hp; 1966, 265 hp; 1966, 325 hp; 1967, 270 hp; 1967, 325 hp; 1968, 290 hp; 1968, 330 hp; 1969, 290 hp; 1969, 330 hp; 1970, 290 hp; 1970, 330 hp; 1971, 275 hp; 1971, 300 hp; 1972, 190 hp; 1972, 255 hp; 1973, 175 hp; 1973, 260 hp; 1974, 205 hp
• Dodge Charger: 1966, 265 hp; 1966, 325 hp; 1967, 270 hp; 1967, 325 hp; 1968, 290 hp; 1968, 330 hp; 1969, 290 hp; 1969, 330 hp; 1970, 290 hp; 1970, 330 hp; 1971, 275 hp; 1971, 300 hp; 1972, 190 hp; 1972, 255 hp; 1973, 175 hp; 1973, 260 hp; 1974, 205 hp; 1974, 250 hp; 1975, 165 hp; 1976, 170–175 hp; 1976, 240 hp; 1977, 190–195 hp; 1978, 190 hp
• Dodge D-Series Pickup: 1967, 258 hp; 1970, 258 hp; 1971, 258 hp; 1972, 200 hp; 1973, 200 hp; 1976; 1977; 1978
• Plymouth Barracuda: 1967, 280 hp; 1968, 300 hp; 1969, 330 hp; 1970, 290 hp; 1970, 330 hp; 1970, 335 hp; 1971, 275 hp; 1971, 300 hp
• Plymouth Road Runner: 1968, 335 hp; 1969, 335 hp; 1970, 335 hp; 1971, 300 hp; 1972, 255 hp; 1973, E68, 260 hp; 1974, E68, 250 hp; 1975; 1975, E68, 235 hp
• Dodge Challenger: 1970, 290 hp; 1970, 330 hp; 1970, 335 hp; 1971, 275 hp; 1971, 300 hp
• Dodge Ramcharger: 1976, 165 hp; 1977, 165 hp; 1978, 165 hp
• Dodge Magnum: 1978, 190 hp

What varies across the family

Stroke is constant at 3.375" across the family — the displacement spread comes from bore, so these share a crank and differ in the block.

Compression spans 8.2:1 to 10:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.

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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