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acording to an s.a. book the horsepower of the 1971 400m is 260 @ 4400rpm. the torque is 400 pound feet @ 2200rpm. the compression ratio is higher on the 1971 400's than any of the other year models. after 1971, all 400 and 351m's had a compressoin ratio of 8.4:1. the compression ratio of the 1971 400 was 9.0:1. acording to an s.a. book the horsepower of the 1971 400m is 260 @ 4400rpm. the torque is 400 pound feet @ 2200rpm. the compression ratio is higher on the 1971 400's than any of the other year models. after 1971, all 400 and 351m's had a compressoin ratio of 8.4:1 or either 8.0:1. the compression ratio of the 1971 400 was 9.0:1.
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