SFI Certified BellhousingChevy Engine Bolt PatternFits Aftermarket GM TH400 & Powerglide CasesSFI 30.1 CertifiedContoured Mounting FlangeOpen BottomReduced DiameterExternal Shields Not RequiredMade from 6061 T6 Aluminum Our JEGS SFI 30.1 certified Bellhousing is lightweight and made for racing applications. The Bell features an open bottom for easy converter access and reduced diameter for better floorboard clearance. It is designed to work with 4.3L Chevy V6, Small Block Chevy, and Big Block Chevy V8's including GM LS Versions, and will only bolt to aftermarket TH400 & Powerglide Cases such as JEGS 555-60333 TH400 transmission case. Bolts directly to the pre-drilled and tapped holes in the aftermarket cases.Will Not Fit Stock TH400 or Powerglide cases