Engine Push Rod

Pushrods transfer energy from the camshaft to actuate the valves of the cylinder, playing a critical role in overhead valve (OHV) engine performance. In traditional OHV engines, the motion of the camshaft is transferred using pushrods and rocker arms to operate the valves at the top of the engine. These simple yet essential components bridge the gap between the camshaft in the engine block and the rocker arms in the cylinder head, ensuring precise valve timing that directly affects power output, fuel efficiency, and engine longevity.

Understanding Pushrod Function and Design

A pushrod is a long, cylindrical component typically made from steel or alloy that transfers motion from the camshaft to the rocker arms, which then open and close the intake and exhaust valves. The majority of modern rods are hollow, which saves weight and allows oil to travel to the valvetrain at the top of the engine. While overhead cam engines have eliminated the need for pushrods in many modern vehicles, pushrod engines remain popular in American V8 applications, diesel engines, classic car rebuilds, and performance applications where their compact design and simplicity offer distinct advantages.

High-performance engines require push rods that can handle both high RPMs and heavy valve spring loads, with the type of metal, thickness, and diameter all affecting durability. Stock pushrods work well for factory applications, but performance builds demand upgraded materials and construction. Premium pushrods feature heat-treated chromoly steel construction, one-piece machined designs for greater strength, and precise length specifications to maintain proper rocker arm geometry and minimize valvetrain wear.

Top Engine Pushrod Brands

Selecting quality pushrods from reputable manufacturers ensures reliable valvetrain operation under all conditions. S&S Cycle has earned a stellar reputation in the motorcycle and V-twin market, manufacturing pushrods from 7/16 inch chromoly steel tubing for strength and durability, with adjustable designs to ensure accurate replacement valve train operation under all conditions. Their Quickee and Time-Saver pushrods are particularly valued for simplifying installation and adjustment procedures.

Manley stands as a trusted name in performance engine components since 1966. Manley Performance Pushrods are built to withstand the extreme demands of high-performance and racing engines, manufactured from heat-treated chromoly steel and premium one-piece construction offering exceptional rigidity, reducing deflection and ensuring precise valvetrain operation at high RPM. Their pushrods serve everything from hot street engines to professional racing applications.

Melling offers reliable replacement pushrods for stock and mild performance builds, known for precision manufacturing and quality control. Howards Cams provides performance pushrods engineered to complement their camshaft offerings, delivering the strength needed for aggressive cam profiles and elevated spring pressures. Proform Parts rounds out the category with affordable performance options for enthusiasts seeking value without sacrificing quality.

Choosing the Right Pushrods

Proper pushrod selection requires attention to several critical specifications. Length is paramount—incorrect pushrod length can cause premature wear on valve stems, guides, and rocker arms, or prevent valves from opening fully. Diameter and wall thickness determine strength and resistance to deflection under load. Material choice affects both weight and durability, with chromoly steel offering an excellent balance of strength and reduced mass compared to standard steel.

When rebuilding or modifying an overhead valve engine, upgrading to quality pushrods prevents common valvetrain problems. A bent push rod prevents the rod from traveling straight and fully actuating the rocker arm, and a severely bent or broken rod results in the corresponding valve failing to open or close, causing a dead cylinder and immediate power loss. Whether you're restoring a classic muscle car, building a high-performance engine, or simply replacing worn components, investing in premium pushrods ensures your valvetrain operates as designed for thousands of miles.