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6-71's are Supercharged, gear driven.

The toruqe #'s depend on the Hp rating. You can crank up the fuel rate on these engines for more power. If i rember right the 229 hp setting gives you 475 Ftlbs at 1900rpm's. But i'm not 100% sure it's been 5 years since we had a 6-71.

As far as displacement goes 6-71 stands for 6 cylinder, 71 cubic inch displacement. So a 6-71 is 426 cubic inches. The 2 stroke DD is going to rap out much faster than the cummalong. (more deiseribale when busting mud holes) Now only being a 426 CID doesen't count because it's a 2 stroke...