Sean, from SoCal Tuning plugged in his laptop and began the ECM tuning process, but we ran into our one and only problem. The valve stem seals didn't seat properly and our 4.8L was smoking. Keeping the tune very conservative, the rear wheels spun to 297 hp and 294 lb-ft of torque. Up 15 hp and 7 lb-ft of torque, our numbers don't represent the usual end results of a cam and tune install on an LS engine, but with the engine smoking, it was the safest route. We could have blown it up, but we chose not to.