318 Cam

Here's some compression info.

Horsepower and torque figures prior to 1972 are SAE gross (measured without any accessories connected to the engine). Horsepower and torque figures from 1972 and after are SAE net (measured with all accessories connected to the engine). Not all engines were available with all cars — or even to the general public.

For more information, see allpar’s pages on the 273, 318, and 360 / 340 / 383 and 413 / 361

Engine Year(s)



Comp Ratio Horsepower Torque (lb-ft)

318-2 bbl 1960-1962 9.0 to 1 230 @ 4400 340 @ 2400
318-4 bbl 1960 9.0 to 1 255 @ 4400 345 @ 2800
318-4 bbl 1961-1962 9.0 to 1 260 @ 4400 345 @ 2800
318 1968-1969 9.2 to 1 230 @ 4400 340 @ 2400
318 1970 8.8 to 1 230 @ 4400 320 @ 2000
318 1971 8.6 to 1 230 @ 4400 320 @ 2000
318 1972 8.6 to 1 150 @ 4000 260 @ 1600
318 1973 8.6 to 1 150 @ 3600 265 @ 2000
318 1974 8.6 to 1 150 @ 4000 255 @ 2200
318 1975-1976 8.5 to 1 145 @ 4000 255 @ 1600