Ford Racing M-6010-B302BB Boss 302 Big Bore Engine Block 4.120" Bore

The Ford Racing M-6010-B302BB Boss 302 Big Bore Engine Block is engineered for serious performance enthusiasts building large-displacement small block Ford engines. Cast from high-strength diesel-grade iron with siamese bores, this block features significantly thicker cylinder walls and decks compared to any factory Ford production block, delivering exceptional strength and durability for racing and high-performance applications.

Key Specifications:

• Unfinished bore size: 4.120 inches (machined an additional 0.125" during manufacturing)
• Supports engine displacements up to 363 cubic inches
• 8.2-inch deck height design
• Cast and machined in the USA to the highest industry standards
• Weight: Approximately 163 lbs

Design Features:

• Siamese bore construction with thick cylinder walls for maximum strength
• Compatible with original 302 and 351W block mounting and bellhousing patterns
• Retains factory Mustang oil pan compatibility (requires custom oil pickup tube M-6622-BOSS302)
• Original-style oil filter location and motor mount boss locations
• Clutch cross shaft pivot hole retained for manual transmission applications

Required and Recommended Components:

• Requires special length 1/2-inch head bolts (M-6065-BOSS) or head studs (M-6014-BOSS recommended with M-6049-X306/307/Z304DA heads)
• Uses common OD cam bearings (M-6261-J351/R351)
• Includes unique cam plug (M-6026-S351)
• Head gasket M-6051-S331 or M-6051-CP331 recommended
• Timing cover M-6059-D351 recommended (designed to use stock-type timing covers)

This Boss Big Bore block represents the pinnacle of small block Ford engineering, combining modern manufacturing techniques with race-proven design. The oversized bore capability makes it simpler and more cost-effective to build high-displacement small block engines while maintaining the legendary Boss block strength that has been proven on tracks and streets around the world.