Abstract: A method of making an engine transmission bellhousing includes the steps of making the pattern for sandcasting a bellhousing having an engine attaching flange portion shaped to cover the engine bolt holes in a plurality of different engines, and making a mold using the pattern for sandcasting a bellhousing. Then selecting an aluminum alloy having the strength and characteristics selected to eliminate a bellhousing flexplate, which aluminum alloy includes aluminum alloyed with either zinc or silicon and selected other elements in lesser quantity and then casting the engine and bellhousing in the sand mold made with the bellhousing pattern.