After spending time as a Marine, Kyle Thompson returned to civilian life with a serious need for speed. He started Thompson Motorsports to feed his passion, and today the Texas-based engine shop churns out 550 engines a year like this 440 cid LSX methanol engine for radial drag racing! Find out went into this low 4-second engine build in our latest Engine of the Week video sponsored by PennGrade Motor Oil and Elring.