Edelbrock Camshaft Rollin Thunder Chrysler Big Block 426 HemiEdelbrock Rollin' Thunder Camshaft #2212 is designed for 426 572 Chrysler HEMI V8 engines and produce optimum torque from the low end to the mid range. Rollin' Thunder camshafts should be matched 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. You can expect a major improvement in throttle response and torque. In the manifold section you'll find