I did a pre instal dyno, open header dyno and one with the stock exhaust reconnected. There was a problem with the software settings with the post instal dyno's so I threw them out and did about 10 more pulls the next day. Similar temperature, same dyno that I always use. Confirmed the results at the 1/4 and 1/2 mile. (4 hp) Now with a retune and raised rev limiter (posted dyno sheet) it seems much healthier and I hope to confirm the power this weekend, if the rain stops falling.

I really don't know much about torque vs. horsepower. All I know is the racers build and tune for HP and the torque is what it is. It's a good bet tractor pullers built for torque and the HP is what it is. I agree it's foolish to rev to 7000 rpms without beefing up the valve train. I'm nervous at 6500 and leave the car shifting at the stock redline most of the time.

Les