PEP HIGH PERFORMANCE SHAFT ROCKERS

More Power - Reduced valvetrain friction equals more power, regardless of valve lift or rocker ratio. Shaft rockers are more stable at high rpm ensuring accurate valve timing events. Shaft rockers are mounted to the head using a steel stand that positions the roller directly over the valve tip while the stud rocker is aligned by the stud location and a .080-inch-wall tubular pushrod and guide plate – which one would you rather have in your engine? In many cases the valve, stud and pushrod guide are not actually in line, as found with most small block Chevy intake rockers. This misalignment was generally compensated for in the stamped pivot ball rockers, but became a serious liability to the stud mounted roller rocker as it had no way to correct the misalignment with their single plane trunions.

Increased Reliability - Because the longer pivot length rocker does not side-load the valve as much, shaft rockers are easier on valve guides, valve seats and valve tips – fewer comebacks for the engine builder. Shaft rockers simply rotate to take up valve lash – stud rockers slide up and down the stud taking up the valve lash before they open the valve. Example: If your valves are lashed at .030-inch, your stud rocker is sliding up and down the stud every time the valve opens. Just imagine this slide-hammer effect at 7,000rpm! And when valve float occurs, the entire weight of the rocker is loaded onto the valve tip until the system resets.

User Friendly - Lashing the valves with stud rockers and the attending stud girdle is a pain in the neck. First, you loosen the stud girdle, lash the valves, and then re-tighten the stud girdle. If the studs are the least bit out of alignment, tightening the stud girdle changes the valve lash. Shaft rockers hold lash much longer and are easier to lash properly. On some vehicles like 5.0 Mustang racecars, the valve covers are very difficult to remove between rounds, so having a vehicle that can go the entire race weekend without adjusting the valves is a big deal. Most racers have found they can remove shaft rockers from their stand to change a valve spring and return them without adjusting the lash again.

Additional Benefits - Shaft rockers also offer other features such as; they are more adaptable to constantly changing cylinder heads, they enable pushrod offsets to clear wider ports, and have assorted pivot lengths to accommodate a wide range of ratios!