These steel bellhousings are WISSOTA approved for Midwest Modifieds and work with both small block Chevy and small block Ford engine bolt patterns. They allow for use with Muncie/Saginaw style transmissions. SBC and SBF engine bolt patterns 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 flexplate/flywheel Made in the USA