Ford Racing M-6250-B303 Hydraulic Roller Camshaft for Small Block Ford 5.0L 302

The Ford Racing M-6250-B303 is the legendary B303 hydraulic roller camshaft specifically engineered for the 5.0L Fox-body Mustang and small block Ford applications. This performance camshaft delivers a noticeable power improvement with a distinctive lumpy idle while maintaining excellent driveability characteristics, making it ideal for street-driven performance builds.

Performance Specifications:

• Advertised Duration: 284°/284° (intake/exhaust)
• Duration at 0.050" Lift: 224°/224°
• Valve Lift: 0.480"/0.480" (with 1.60 rocker ratio)
• Lobe Separation Angle: 112°
• Optimal RPM Range: 3,000-6,000 RPM
• Hydraulic roller lifter design

Key Features:

• Provides strong low-end torque with significant power gains above 4,000 RPM
• Aggressive exhaust note with characteristic performance idle
• Compatible with carburetors or mass air fuel injection systems
• Designed for 1985 and later 302/5.0L roller cam blocks
• Also fits 1963-1984 non-roller cam blocks with aftermarket hydraulic roller lifters
• Compatible with 1994-1997 351W blocks when used with mass air EFI
• Works well with manual transmissions or automatic with high-stall converter

Important Installation Requirements:

• Upgraded valve springs required: 120 lbs seat pressure minimum, 295 lbs open
• On EFI engines, works only with mass air induction systems
• Will not work with Explorer EEC-V EFI or speed density EFI systems
• High-stall torque converter recommended for automatic transmissions
• Piston-to-valve clearance should be checked
• May require longer pushrods depending on application

The B303 camshaft represents over 50 years of Ford Performance engineering expertise, making it one of the most popular choices for small block Ford enthusiasts seeking a balance of street manners and performance. This camshaft is designed for racing use and is not legal for street use in emission-regulated areas.