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Price: $53.60
Procomp (Speedmaster) Set of Chromemoly
5/16\" 7.900 Length PushrodsPart # PC7802 /PCE254.1002Specifications:
Pushrods are .080 thick
.100 Longer than stock / factoryTHIS IS THE ONLY TYPE PUSHROD YOU SHOULD BE RUNNING IF YOUR CAM IS ABOVE STOCK IN LIFT AND DURATION. THE STANDARD PUSHRODS WILL FLEX IN THE ENGINE, AND RISK BENDING UNDER HIGH RMP. THESE DO NOT HAVE THE WELDED BALL ON THE END. WE ONLY USE THE SWEDGED ONE PC. DESIGN. A WELL PROVEN DESIGN FAR SUPERIOR TO THE OEM STYLE. 4130 CHROMOLY STEEL IS ALSO MUCH STRONGER, AND WILL RESIST FLEXING. WHEN A PUSHROD FLEXES IN THE ENGINE YOU ARE LOOSING LIFT. The more rigid the pushrod the better off you will be. Pushrods are the weakest link in the upper valve train. Pushrods transfer and redirect the upward motion of the lifters, which goes in one direction, to the rocker arms which move in another direction. Consequently, they are subjected to bending forces as the load and engine speed increases. Most of the deflection occurs at the lower end of the pushrod where the side loads are typically the greatest. It is recommended going withhigher strength pushrodsThe pushrods must also be made of a stronger material. Stock pushrods are typically made of 1018 steel tubing, which is not strong enough for springs that have more than 400 psi of open pressure, or engines that exceed5500 rpm. Even if your engine is not exceeding 5500 rpm, you must use stronger pushrods than stock, if your cam is several steps above oem. Usually the valve springs in engines running larger cams are much stiffer, and this is reason enough to go to a better pushrod. Pushrods made of 4130 or 4140 chromoly tubing are much stronger and are recommended for almost all types of racing. Pushrod deflection can also be reduced by using single taper or offset dual taper pushrods. The thickest part of the pushrod should be positioned closest to the lifters to take advantage of the larger cross-section. It is especially important to use tapered pushrods in engines that are equipped with roller lifters, increased valve lash, high ratio rocker arms, double or triple springs and operate at high rpm.