If you're building an all-out competition car you need a lightweight flywheel that will allow the engine to rev quicker and not eat up a lot of power. RAM billet aluminum flywheels greatly reduce rotating weight to permit quicker revving and higher power output but still retain enough mass to resist heat distortion that could adversely affect clutch performance. These flywheels are CNC-machined from certified materials and have a rugged steel friction-surface insert. The insert is Blanchard-ground parallel to the crankshaft flange after installation to minimize runout and provide the optimum clutch-mating surface. These flywheels are SFI-approved.