Plymouth RB Engine Specs

Bore, stroke, displacement and compression for all 25 Plymouth RB engines, compared side by side. Plus rod ratio and head specs where published.

At a glance

Displacement	413–440 ci
Cylinders	8
Bore	4.126–4.319"
Stroke	3.750–3.902"
Compression	10.0–11.0:1
Advertised power	220–420 hp
Years	1959–1978

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
G	440 ci	4.3189" × 3.752"	10.1:1	375
V	440 ci	4.3189" × 3.752"	10.5:1	390
440 RB TNT	440 ci	4.3189" × 3.752"	—	365–375
440 RB 4bbl	440 ci	4.3189" × 3.752"	—	335–350
U	440 ci	4.3189" × 3.752"	—	375
V	440 ci	4.3189" × 3.752"	—	385–390
440 Magnum 4-bbl	440 ci	4.3189" × 3.752"	—	275–375
440 Six Pack 3x2-bbl	440 ci	4.3189" × 3.752"	—	390
440 Six Pack, three 2-bbl	440 ci	4.3189" × 3.752"	—	385
R/T std	440 ci	4.3189" × 3.752"	—	375
A12	440 ci	4.3189" × 3.752"	—	390
RB (1967–1976)	440 ci	4.3189" × 3.752"	—	255–390
4-bbl	440 ci	4.3189" × 3.752"	—	220
RB 440	440 ci	4.3189" × 3.752"	—	220–235
M-code	440 ci	4.3189" × 3.752"	—	375
E	426 ci	4.25" × 3.75"	10.3:1	365
RB · 4.250" × 3.750" · 11:1	426 ci	4.25" × 3.75"	11:1	365–415
413 4BBL	413 ci	4.126" × 3.9016"	10:1	340
413 RB wedge	413 ci	4.126" × 3.9016"	—	380
413 RB long-tube cross-ram	413 ci	4.126" × 3.9016"	—	375
413 RB short-tube cross-ram	413 ci	4.126" × 3.9016"	—	390–405
413 RB 4bbl	413 ci	4.126" × 3.9016"	—	340–360
413 RB dual 4bbl	413 ci	4.126" × 3.9016"	—	380
High Performance Package	413 ci	4.126" × 3.9016"	—	360
RB (1962)	413 ci	4.126" × 3.9016"	—	385–420

Factory cars with a RB

• Chrysler 300: 1959, 380 hp; 1960, 375 hp; 1960, 400 hp; 1961, 375 hp; 1961, 400 hp; 1962, 340 hp; 1962, 380 hp; 1962, 405 hp; 1963, 360 hp; 1963, 390 hp; 1964, 360 hp; 1964, 390 hp; 1965, 360 hp; 1966, 365 hp; 1967, 350 hp; 1967, 375 hp; 1968, 350 hp; 1968, 375 hp; 1969, 350 hp; 1969, 375 hp; 1970, 350 hp; 1970, 375 hp; 1971, 335 hp; 1971, 370 hp
• Dodge Dart: 1962, 385 hp; 1962, 410 hp; 1962, 420 hp; 1969, 375 hp
• Dodge D-Series Pickup: 1964, 360 hp; 1974; 1975; 1976; 1977, 220 hp; 1978, 220 hp
• Dodge Charger: 1967, 375 hp; 1968, 375 hp; 1969, 375 hp; 1970, 375 hp; 1970, 390 hp; 1971, 370 hp; 1971, 385 hp; 1972, 280 hp; 1973, 280 hp; 1974, 275 hp
• Dodge Coronet: 1967, 375 hp; 1968, 375 hp; 1969, 375 hp; 1969, A12, 390 hp; 1970, 375 hp; 1970, 390 hp; 1973, 280 hp; 1975, 260 hp; 1976, 255 hp
• Plymouth GTX: 1967, 375 hp; 1968, 375 hp; 1969, 375 hp; 1970, 375 hp; 1970, 390 hp; 1971, 370 hp; 1971, 385 hp
• Plymouth Barracuda: 1969, M-code, 375 hp; 1970, 375 hp; 1970, 390 hp; 1971, 385 hp
• Plymouth Road Runner: 1969, A12, 390 hp; 1970, 375 hp; 1970, 390 hp; 1971, 385 hp; 1972, 280 hp; 1973, 280 hp; 1974, 275 hp
• Dodge Challenger: 1970, 375 hp; 1970, 390 hp; 1971, 385 hp
• Dodge Ramcharger: 1975, 235 hp; 1976, 235 hp; 1977, 220 hp; 1978, 220 hp

What varies across the family

Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.

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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