1970 Engines

1970 was the best year for engines of the American muscle car era. Starting in 1971 emission control laws along with high insurance premiums and then high gasoline prices began reducing the horsepower of all engines. In 1971 both 440’s were down 5 horsepower. In 1972 the 426 Hemi and the 440 Six Pack disappeared and the 440 4 Barrel was down 40 horsepower to 335 horsepower from 375 horsepower in 1970.

Name Displacement Horsepower Torque Carburetors Compression Years in Engine Bore Stroke Name
cu in (L) bhp (kW) @ rpm lb-ft (Nm) @ rpm Ratio Production Family in (mm) in (mm)
426 Hemi 426 (7.0) 425 (316.9) 472 (640) 2 Carter AFB 4 Barrel 10.25:1 1966-1971 Hemi (Gen 2) 4.25 (108.0) 3.75 (95.3) 426 Hemi
440 Six Pack 439.7 (7.206) 390 (291) 490? 3 Holley 2 Barrel 10.5:1 1969-1971 RB 4.32 (110) 3.75 (95) 440 Six Pack
440 Magnum 4 Barrel 439.7 (7.206) 375 (280) @ 4700 490? Carter AVS 4 Barrel 9.7:1 1966-1978 RB 4.32 (110) 3.75 (95) 440 Magnum 4 Barrel
383 Magnum 4 Barrel 383 (6.3) 335 @ 5200 425 @ 3400 Carter AVS or Holley 4 Barrel 9.5:1 1966-1971 B 4.25 (108) 3.375 (85.7) 383 Magnum 4 Barrel
340 Six Pack 339.4 (5.562) 290 (216) @ 5000 345 (468) @ 3400 3 Holley 2 Barrel 10.5:1 1970 LA 4 (102.6) 3.3 (84.1) 340 Six Pack
340 4 Barrel 339.4 (5.562) 275 (205) @ 5000 266 (360) @ 3200 Carter AVS 4 Barrel 10.5:1 1968-1973 LA 4 (102.6) 3.3 (84.1) 340 4 Barrel

All engines are naturally aspirated, OHV pushrod V8s using premium gasoline.

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