Simple. 5.13 gears, 8" 5200 stall converter, 320 duration @ 050, 450 lbs valve springs. It's no secret how they do it. They blast through the 1/8 which results in a good 1/4 mile time. Ever notice how most stock eliminators speed is a little slow for the ET? That's why. But they only mention the .427 lift cam... lol