Well, dynoed the truck today, and the numbers seem a bit high to me.

Factory spec flywheel peak numbers are 325 HP at 3,300 RPM and 570 torque at 2,000 RPM

On the dyno on the second pull my truck made Peak HP of 319 at 3,300 RPM and 534 peak torque at 2350 RPM.

First pulls was from 1800 RPM to 3400 with RPM signal erratic above 2900 RPM, best torque 548 was that run, but HP was 312. Second pull was 1800 RPM to 3450 with RPM signal erratic above 3050 RPM with HP 319 and torque 534. Finally on run number three the RPM signal stayed good for the whole pull from 1700 RPM to 3500 RPM, HP was 319 again with torque of 520.

So, torque numbers seem reasonable, but the HP numbers seem high. I haven't seen any stock 6.0 dyno charts here to use for comparison purposes. Anyone have a link to some?

Later,

Keith