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It also saw the introduction of the 340 4-BBL option and a detuned 383 "Road Runner" engine with 8.7:1 compression and power dropping to 300 hp (224 kW). In return, Road Runners with the 340 and 383 engines received a standard insurance rating without the costly premiums normally tacked onto muscle cars. The 383 would now run on regular gas.
The 1960 383 engines featured the same basic ram induction system as the Chrysler 300F's 413 RB engines (named Sonoramic Commando when sold in Plymouth form). The later 383 Magnum (starting in 1968) used the 440 Magnum heads, camshaft, and exhaust manifolds. This engine was advertised at 335 hp (250 kW; 340 PS).
The 2-barrel was rated at 290 hp (220 kW). The four-barrel engine was rated at 330 hp (250 kW) and was identified on the air cleaner as "383 / FOUR BARREL". The 330-hp engine was unique to the Charger model in 1969. While this engine was available with an un-silenced air cleaner option, it differed internally from the 335-hp 383 "Magnum".
The original Super Bee was based on the Dodge Coronet, a 2-door model, and was produced from 1968 until 1970. It was Dodge's low-priced muscle car, the equivalent to Plymouth Road Runner, and was priced at $3,027. Available with the Hemi engine, this option increased the price by 33% thus 125 models were sold with this engine option.
The 383 Super Commando engine was upgraded with the intake manifold, camshaft, and cylinder heads from the Road Runner and Super Bee, but the more restrictive exhaust manifolds specific to the A-body cars limited its output to 300 bhp (224 kW). [9]
The Plymouth Road Runner was introduced as a low-price, high-performance alternative to the GTX. Richard Petty won the Grand National championship in NASCAR in a Belvedere. The GTX came standard with the 440 CID engine and the Road Runner with the 383 Magnum, with the 440 six-barrel or the 426 Hemi engines optional.