3/8in 351C Guide Plate

The 3/8in 351C Guide Plate is a precision-engineered pushrod guide designed for serious marine and automotive builders who demand reliability under extreme operating conditions. Whether you're restoring a classic 351C-powered vessel, upgrading a performance marine engine, or building a high-revving street application, this guide plate ensures proper valve train geometry and prevents lateral pushrod deflection. Built by MANLEY—a name synonymous with OEM-quality and competition-grade engine components—this guide plate is essential for maintaining valve train stability in engines that see sustained RPM and load.

This 3/8-inch guide plate is manufactured to exacting tolerances and works in concert with your 351C pushrod system to maintain consistent valve timing and prevent runout that can lead to bent pushrods, rocker arm wear, and catastrophic valve train failure. The compact design (0.7 inches thick, 10.75 inches in overall length) integrates seamlessly into stock and aftermarket 351C cylinder head configurations. The precision-machined construction ensures that pushrods remain centered in their bores, reducing friction and valvetrain noise while maximizing efficiency across your entire RPM band.

This guide plate is indispensable for anyone building or rebuilding a 351C engine—whether for a high-performance boat, vintage muscle car, or street application. Installation is straightforward for experienced builders with access to proper torque specifications and head-prep procedures. The 0.98-pound weight has minimal impact on overall engine assembly weight while delivering measurable improvements in valve train stability and longevity. Pair this with quality pushrods, rocker arms, and a solid cam profile for a valve train system that delivers years of reliable, quiet operation at high RPM.