Ford 428 engine stroked to 462 cubes. Victor intake with FAST multiport EZ-EFI system. Hydraulic roller cam. Mildly modified Edelbrock heads and 9.7:1 compression. Tested on 93 octane pump gas. Peak horsepower was 534 at 5900 RPM, peak torque was 540 @ 4600 RPM.
The steam from the breathers is just because the dyno cell was COOOLD - it was around 10 degrees outside and every time we shut down the fans after a pull the room would drop temperature. You could see your breath in there.