using stock intake and exhaust manifolds and a modified stock down-pipe plumbed without muffler or cat directly into the dyno cell´s exhaust removal system. It turns out a well-tuned stock 10:1 2.2-liter Ecotec in the above configuration actually develops 168 crankshaft hp (wich is above the factory rating of 140-150 as installed in various vehicles in the United States and Europe). At this point, the team began to pump up the volume in a rigorous series of tests while a crew stood by with fire extinguishers. Testing at a given power level concluded when the engine could survive a series of 8-10 fullpower dyno "Sprints" from peak torque through maximum power in 50 rpm steps, concluding with at least six seconds at full power, for a total of at least 20 very hard seconds. GM Racing successively verified that the Ecotec survived happily at 200, 225 and 250 hp over numerous dyno pulls. However, as the Ecotec pushed through 283 hp at 4400 rpm, all four connecting rods simultaneously failed catastrophically and smashed through the side of the block. Laboratory analysis subsequently revealed a mid-beam compression fracture on all stock powder-metal rods. All other components checked out fine.