Mr. Bud Racing of Lafayette, Louisiana had the naturally-aspirated ECOtec race engines installed in their hydroplane boats by Roush Industries in Livonia, Michigan. The engine, based on the production 2.2L L61 ECOtec, was modified with 3.500-inch sleeves, Eagle crank and rods, JE pistons, and a Cometic headgasket.

The production L61 ECOtec head was ported specifically for this application, modified to accept high-lift cams, and assembled with GM Performance Parts adjustable cam gears, Ferrea valves and keepers, PSI springs, and Trick Titanium retainers. This naturally aspirated race engine runs on E85 fuel, produces about 340 horsepower, and turns 9,000-10,000 rpm.