Because of emission standards that were changed around 1970 the compression ratio was lowered in those big block dodge engines.... Most likely 8 or 8 1/2 to 1......
The 440 was produced from 1966 until 1978, making it the last version of the Chrysler RB block. It had a cast iron block with iron heads and a bore of 4.32 inches (109.73mm).
From 1967 to 1971 the high performance version was rated at 375 (370 in '71) SAE gross bhp (280 kW) at 4700 rpm with a single four barrel carburetor, and from 1969 to 1971, the highest output version was the 440 Six Pack (for Dodge, 440 6 Barrel for Plymouth) and 390 (385 in '71) hp (291 kW) with three two barrel Holley carburetors.
From 1972 onwards the motor was equipped according to the new Clean Air Act, which muffled the output to a rated 335 bhp (250 kW) SAE gross at 4400 rpm through a drop in compression, cam timing and other tuning measures. Also in 1972, the U.S. industry switched to SAE net ratings, that is, with alternator, air cleaner, mufflers, and other real-world, power-consuming equipment attached, which resulted in a more realistically rated 225 bhp (168 kW) SAE net at 4400 rpm, which very closely coincided with period German DIN ratings and TUV measurements.
The high output 440 was marketed as the Magnum in Dodges, the Super Commando in Plymouths, and the TNT in Chryslers.
Even if its a lower compression engine it is still an easy build to get a lot of power.......
|||for 74 model it should be 8.1/2.1,if its an early 74 it could be a 9.1/2.1 good luck.|||likley around 8 1/2 to 1
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