Aug 10, 2017 · A minute into my first lap of the session, a high-pitched mechanical howl rang out. It was shrill, rhythmic, like a piston airplane was taking off next to my head. I pulled off the track, shut down the car and the sound stopped. I started looking around for obvious things: a broken serpentine belt, an exhaust rattle, something minor. Edelbrock Rollin' Thunder Camshaft #3714 is designed for 4.3L 90 Degree V6 Chevy engines and produce optimum torque from the low-end to the mid-range. Rollin' Thunder camshafts match with Performer manifolds for vehicles operating from off-idle to 5500 rpm. They are smooth idling cams for daily drivers, trucks, vans, RVs and 4x4s.