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Amazingly, the original 340 is still in place. In emissions-conscious 1972, the top dog 340 suffered a compression cut to 8.5:1 (down from 10.3 in 1971) and smaller 1.88 intake valves (down from 2.02 in 1971), reducing output from 275 to 240. On the upside, electronic ignition and an 800-cfm Carter Thermo-Quad (both still present) were added for '72 to restore some lost ground. We're digging the non-A/C and manual brakes and steering-power-sapping luxuries made unnecessary thanks to the Duster's low 3,175-pound curb weight.