NEW SWS CHEVY 621 ALUMINUM BELLHOUSING, FLYWHEEL INSPECTION COVER, THROWOUT BEARING, CLUTCH FORK, CLUTCH FORK BOOT & PIVOT BALL, STAMPED WITH #GM 3899621, FOR SBC & BBC 11" MANUAL CLUTCH APPLICATIONS Brand New Southwest Speed Aluminum Bellhousing Kit with Throwout Bearing for use with 11" Clutches with Manual Transmission &gt; The kit includes a Factory Reproduction GM # 3899621 Stamped Bellhousing, Flywheel Inspection Cover, Clutch Fork with Ball Retaining Spring, Throwout Bearing, Clutch Fork Boot, and Clutch Fork Pivot Ball (SWS Part # 650-3976, 650-3968, 650-4028, 650-4035, 650-3952, and 650-4018) This performance aluminum bellhousing has the GM Part # 3899621 casting number stamped on the outside of the bellhousing just like the original &gt; If you are doing a restoration of an early muscle car, or just want the original 621 bellhousing to finish that rod project, this bellhousing is the perfect part Applications &gt; 1964-1988 Chevy Chevelle, Malibu, Monte Carlo* &gt; 1959-1987 Chevy El Camino* &gt; 1959-1988 Chevy Impala, Caprice, Bel Air, Biscayne, Brookwood, Kingswood, Nomad, Sedan Delivery* &gt; 1963-1981 Chevy Corvette* &gt; 1967-1981 Chevy Camaro* &gt; 1968-1974 Chevy II, Nova* &gt; *With Manual Transmissions and 168 tooth Flywheel The bellhousing was used with 4 speed transmissions in 66-72 Chevelle, 66-81 Corvette, 67-72 Camaro, 68-72 Nova, and 64-81 Impala, but with any GM transmission that measures 4.675" and an 11" clutch, it will fit great in all of the additional applications shown above, as well as many different types of projects &gt; This will make it a snap to get that big GM bellhousing in your muscle car or rod project This will make it a snap to get that big GM bellhousing in your muscle car or rod project. &gt; This new Chevy high performance 11" style aluminum bellhousing was issued on Camaros, Chevelles, Impalas, Corvettes and Novas with big block 396, 427, and 454 engines, as well as Yenko, Copo, and ZL1 and also small blocks like 302, 327, 350 and 400 with the 168 tooth, 14" flywheels and 11" clutches, including Z28, Yenko, and Deuce models