11/10/2008 05:57. Just as Harry Hogge (Robert Duvall) said in Days of Thunder, "There's nothing stock about stock cars," there is also very little that is stock in the LS2s that Katech Performance builds for the GM Racing CTS-V race team that competes in the SCCA SPEED World Challenge [SPEED GT class]. Though the bore, stroke, and block are exactly as you would find in a production CTS-V, Katech goes to great lengths to ensure optimum performance and longevity throughout the grueling races the motor must endure. We were interested in getting an in-depth look at these "stock" motors to find out how they manage to be so powerful, yet reliable despite hours of sustained high rpm-and with permission from GM, Katech granted our wish.

Katech's Caleb Newman informed me that first each factory LS2 block undergoes... // GM High-Tech Performance Magazine