Ford 351W Main Cap Support

The CANTON Ford 351W Main Cap Support (SKU CAN21-062) is a reinforced main cap girdle engineered to stabilize and protect the crankshaft assembly in small-block Ford applications. Constructed from 0.625-inch-thick steel with black oxide finish, this component provides critical structural support under high-RPM operation and extreme combustion pressures—making it essential for performance engines, race builds, and heavily modified platforms where factory bottom-end integrity becomes a limiting factor.

Main cap girdles function by tying all main cap bolts together into a unified assembly, dramatically reducing main cap deflection during peak cylinder pressure events. The 0.625-inch steel construction provides the thickness needed to handle the loads generated in high-boost supercharged applications, naturally aspirated stroker motors, and nitrous-equipped small-block Ford engines. Black oxide coating resists corrosion while maintaining a clean appearance in engine bays that see regular maintenance and inspection. This kit-format design simplifies installation and ensures all contact surfaces remain perfectly aligned for maximum clamping efficiency.

Buyers pursuing serious performance upgrades—including drag racing, road racing, forced induction conversions, or displacement increases—rely on main cap support systems to extend crankshaft service life and prevent catastrophic bearing failure. CANTON's reputation in the Ford small-block aftermarket centers on precision manufacturing and metallurgy optimized for the specific loads these engines encounter. Whether building a 400+ horsepower street cruiser or a competition platform, this main cap support addresses a failure mode that becomes increasingly probable as power levels climb above stock specifications.