Center Main Caps - Ford 351C 4-Bolt- Flat Bottom

The Center Main Caps - Ford 351C 4-Bolt - Flat Bottom from PRO-GRAM ENGINEERING are precision billet steel engine components designed for high-performance Ford Cleveland and modified engine builds. These center main caps serve as critical structural elements in the engine block, supporting the crankshaft and maintaining proper bearing alignment under extreme stress conditions. Whether you're building a street engine, race platform, or restoration project, these caps provide the reliability and durability required for consistent performance and longevity.

Manufactured from billet steel with a flat bottom design, these four-bolt main caps deliver superior strength compared to factory castings, preventing crankshaft deflection and maintaining proper oil clearances across the bearing surfaces. The flat bottom geometry reduces stress concentration points and allows for more controlled torque application during installation. Each set includes three caps (as noted in the existing specification), engineered to OEM or high-performance specifications for the Ford 351C platform. The 8.7-pound weight reflects the solid construction necessary for aggressive engine builds that demand resistance to flexing and movement during high-RPM operation or forced induction applications.

These center main caps are ideal for engine builders, restoration specialists, and performance enthusiasts working on Ford 351C or Cleveland-derivative engines. Installation requires proper torque sequencing and use of quality fasteners to ensure even clamping load distribution across all four bolts. Compatibility extends to modified engine applications where factory components may prove insufficient for increased horsepower or boost levels. Professional machine work and proper bearing selection are essential to maximize the structural benefits these billet caps provide and achieve optimal engine block integrity.