Brand New Southwest Speed Bellhousing, Small Block Chevy/Ford, Steel (Part #650-3997). This bellhousing is designed to fit all Gen 1 small block Chevy engines and small block Ford engines (302/351 Windsor and 351 Cleveland). You must use a 153-tooth (GM) or 157-tooth (Ford) flywheel with this application. You can mount a traditional GM Muncie/Saginaw 4-speed, or aftermarket boxes such as Bert, Brinn, and Falcon 2-speeds. So, if you are starting with a used four-speed and wish to upgrade to an aftermarket race-spec transmission this bellhousing can accommodate your updated trans of choice. Features: SBC and SBF engine bolt patterns Laser-Cut, CNC-finished flanges for perfect fit Adapts either engine to Muncie/Saginaw pattern transmissions including BERT, Brinn, Falcon, etc. Bottom opening for easy access Does NOT have provision for stock style clutch arm WISSOTA approved for Midwest Modifieds Non SFI rated NOT for street use Must be used with a 153 tooth (Chevy) or 157 tooth (Ford) or smaller flywheel Specs: Brand: Southwest Speed Clutch Operation: Hydraulic Engine: Small Block Chevy | Small Block Ford Flywheel: 153 tooth (Chevy) | 157 tooth (Ford) Material: Steel Product Type: Bellhousing Weight: 21.55 lbs. Transmission Type: Manual