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I know of at least one cummins that's done 1784 on our dyno fuel only that is in the competition. He backed it up with a 169x i believe this year at jefferson state and had a cracked block (Pat Liskey)
Duramax...I haven't really kept tab's on. Max'd out has done 1400 on our dyno like Busted said ^
PSD didn't some get close or did around 1200 fuel only?
craig's 6.7 did right under 1300 iirc . that was the first dyno session i'm sure it has a nother few hundred in it once he gets the motor built proper .