Auction is for a solid cast aluminum marine bell housing, this housing will fit 1970-1973 454ci. Marine engines. 7.4liter may be computable for othe year blocks. this item is in perfect shape no rot, not chipped, no corrosion or cracks.. To the aluminum, Also has a Borg Warner bolt pattern for transmission connection, and top rear mount starter access, also comes with a lower back plate not pictured.