Specialty Flywheels are available for many applications. We have done lightweight race types to reduce reciprocating mass. We have done lightweight versions for 225 V6’s that have saved almost 30 lbs! We h ave even done an ultralight 215 for a boat application were a clutch would not be used. As an example, a 350 race prepared aluminum flywheel with steel wear surface weighs approx. 13 lbs verses an all steel 35 lbs.