You are looking at a 1973 to 85 Chevy truck clutch bellhousing. This aluminum bell is cast # 6263756 and is correct for 73 to 85 Chevy & GMC 10 to 30 series truck (2 & 4wd), Blazer and Suburban with Muncie 3 or New Process 4 speed, 6 cyl or V8 (even 454). Please note this bell has the 5^th hole for a 5 bolt transmission. Fits 5 bolt or standard 4 bolt transmission. Center hole is 5 inch. Fits up to a 12 inch clutch. The bell is solid with no cracks, snapped off bolts or hidden repairs.