A few people on this site mentioned that I might have spark plug blowout on my last dyno and they were right. I couldn't rev past 5700rpm so I replaced the plugs, gapped them to .035, and pulled right to 6200rpm. Best run of three:
400.3rwhp/386.3rwtq SAE corrected
Still using the 6lb pulley, 7" crank pulley, and powerpipe. Not bad for the little underachiever Powerdyne.
