SEMA 2025: PRW Debuts New LS Rocker Arm System

EMA always brings out the most intriguing new hardware, but few parts drew as much steady attention as PRW’s newest LS rocker arms. Tucked into their display was a redesigned system built for the exact problems LS engines are known for. PRW’s Director of Engineering, Shaun Snow, walked through the new components and broke down the updates that give these rocker arms more consistent oiling and a stronger overall foundation for LS valvetrains.

Direct Oiling Redefined For LS Rocker Arms

One of the most important updates to PRW’s rocker arms is the direct-oiling path that feeds oil straight into the needle bearings. Instead of relying on splash oiling or inconsistent distribution across the top end, the rocker body routes oil from the pushrod through the rocker and directly into the bearings.

Snow explained how the passage works. “Oil comes up through the pushrod here, goes down, and comes back out to the nose. The bearing has a little hole in the race to pour oil into the actual needles.” He noted that LS engines can have trouble getting oil to the valvetrain, especially when tall valve covers are used, and this design makes sure that the oil reaches the bearings instead of spraying upward and missing the components entirely.

Shaft-Mount Option Expands The LS Rocker Arms Line

PRW also introduced a shaft-mounted version of its LS rocker arms, built around the same rocker body but using a CHE-manufactured shaft and upgraded bushings. The bushings include a modified oil hole that allows the assembly to oil in a pattern similar to a main bearing surface.

“This is new. This is a shaft rocker utilizing those same rockers, but with a CHE shaft and bushings,” Snow said. PRW will offer these rocker arms in both adjustable and non-adjustable versions. Fitment includes cathedral-port heads, stock square-port heads, and AFR square-port heads. Additional shaft options for aftermarket square-port applications are in development as CHE finalizes additional drawings.

Material, Ratio, And Future LS7 Variants

The bodies for the new rocker arms are constructed from chromoly-style steel, such as 8620, and retain the factory’s 1.7 ratio. When asked about higher-ratio options, Snow mentioned that demand is low and that higher ratios introduce clearance challenges for LS heads. He added that increasing cam lobe lift is usually more effective than relying on rocker ratio changes.

PRW also plans to revisit an LS7 version of these LS rocker arms due to renewed interest from cylinder head builders using LS7-style architecture. With inventory now available, PRW’s latest rocker arms provide improved oiling and a stronger valvetrain foundation for builders looking to enhance reliability in their LS engines.