Ford Racing Boss Engine Block - Small Block Windsor Series

The Ford Racing Boss Engine Block series is the definitive modern replacement for the legendary small-block Windsor architecture, engineered using the latest manufacturing technology and materials drawn from both the production and racing worlds. Cast and machined to the highest industry standards in the USA, every Boss block in the lineup is built to a level of strength and precision that surpasses any Ford OE production block ever manufactured.

Premium Iron Construction:

• Cast from diesel-grade iron with siamesed bores, thick cylinder walls, and added material in key high-stress areas — delivering strength far superior to any Ford factory block ever produced
• Advanced casting and machining techniques ensure consistent dimensional accuracy and long-term durability across every unit
• Engineered deck surfaces optimized for superior cylinder head sealing and stability under sustained high-load operation
• Increased bulkhead material and revised cooling system passageways for improved thermal management and structural rigidity
• Threaded core and galley plugs with straight-thread port plugs and O-rings for a professional-grade seal
• NASCAR-inspired front oil feed on both lifter galleries for improved lubrication under racing conditions

Windsor-Compatible Architecture:

• Preserves the critical dimensions and features of the original 289–351 Windsor architecture, providing broad compatibility as a drop-in replacement for Windsor-style engine applications
• Retains factory motor mount boss locations, original bell housing pattern, and clutch cross shaft pivot hole
• Maintains the original-style oil filter location and accepts stock-type timing covers
• Compatible with the M-6026-A Service Replacement Plug and Dowel Kit for professional oil galley and core hole sealing
• Machined to accept factory roller lifter guides and lifter guide retainer

Race-Proven Performance:

• Serves as the proven foundation for Ford Performance sealed race engines and Ford Performance high-performance crate engines
• Validated through thousands of competition laps across road racing, circle track, and high-performance street applications worldwide
• Engineered to support significant stroker applications without additional grinding or clearancing (dependent on crankshaft and connecting rod manufacturer)
• Available across multiple deck height and bore configurations to accommodate a wide range of displacement builds

Whether the goal is a dedicated road racing powerplant, a high-horsepower street build, or a demanding circle track application, the Ford Racing Boss Engine Block series delivers the structural integrity and Windsor-family compatibility to serve as the foundation for a championship-caliber build. Professional engine building experience is strongly recommended — consult a qualified engine builder for component selection and cylinder head compatibility guidance specific to your application.