Outboard Marine Corporation (OMC) developed its own vacuum die casting process to produce true T6 heat treatable aluminum die castings. This process was initiated by OMC Research and developed jointly with OMC Waukegan. The project began 1990 and was put into production in 1992 on the outboard motor lower mount bracket shown in figure 1.OMC is producing vacuum die cast aluminum parts made with 356.0 alloy and T6 heat treated which meet or exceed the strength of similarly alloyed and processed permanent mold or lost foam cast parts. The application of this process is being expanded within the realm of structural outboard motor parts to include other mounting brackets, as well as fuel system components. An automotive die caster is using the technology and equipment provided by OMC to produce leak tight air conditioner compressor housings.