The largest offering in our naturally aspirated LS1/LS2/LS6 lineup, the Stage 4 has proven it’s worth time and time again. The Stage 4 sacrifices a some low rpm torque while on a mission to make max peak power. It is not uncommon to see 460+whp with proper supporting mods including a quality set of cylinder heads. In automatic cars, a higher RPM torque converter is a requirement. Consult your tuner regarding stall speed needs!Lobes designed in house by BTR!