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4 We were expecting better numbers, but the Mustang dynamometer is known to show 13-percent less than a Dynojet or SuperFlow dyno. Still, 406 rwhp and 392 lb-ft torque isn't too shabby considering the mild hydraulic roller cam (0.540/0.560 lift, 242/248 duration @ 0.050). On this pull we found out the A/F mixture was too lean and unsafe at 13.5:1. Routinely, Tune Time will let up during a dyno pull if the A/F goes above 13.2, but your author was driving and we just had to know for our baseline. Having too lean of an A/F ratio put us on a jetting mission to make more safe horsepower with less chance of engine-damaging detonation.