SKU: PFM66779
UPC: 037995317790
MPN: 66779
The PROFORM 66779 valve lash wrench is a two-piece adjustment set built for anyone setting valve clearance on engines with rocker arms and polylock-style adjusters. It pairs a 7/16in wrench for the lock nut with a 1/8in T-handle Allen wrench for the adjusting screw, so one hand turns the screw while the other holds the nut. That setup cuts the adjusting time roughly in half and lets a single person handle a job that usually takes two. We stock it alongside the rest of our engine tools for builders and racers who run their own valve trains.
The set is made of steel with plastic grips on both handles for a solid hold under torque. The 7/16in wrench end fits standard polylock lock nuts, while the 1/8in T-handle Allen seats in the adjusting screw, giving you direct control over each rocker. The T-handle geometry is what makes one-handed operation work: it stabilizes the screw against rotation while you snug the lock nut. According to retailer specifications, the package ships at roughly 8 inches tall, 6 inches deep, and 3 inches wide, weighing about half a pound. The design is universal across common rocker arm lockdown systems, including Jesel shaft rocker assemblies and similar polylock setups, so it carries from one engine build to the next.
Reach for this set any time you're checking or resetting valve lash on a fresh build, after a cam swap, or during routine valve train maintenance. Hold the lock nut with the 7/16in wrench, turn the adjusting screw with the T-handle Allen, then verify clearance with a feeler gauge against the cam maker's spec. It's a tool that earns a permanent spot in the box for solid-lifter and adjustable rocker setups. Round out your bench with a feeler gauge and browse the rest of our shop tools while you're squaring away the valve train.
The set includes a 7/16in wrench for the rocker lock nut and a 1/8in T-handle Allen wrench for the adjusting screw. Together they let one person hold the nut and turn the screw at the same time, which is the design intent behind the kit.
Yes. The whole point of the two-piece design is one-handed operation over the rocker arm lockdown. You hold the lock nut steady with the 7/16in wrench while the T-handle Allen turns the adjusting screw, so you don't need a second set of hands.
It's listed as compatible with Jesel shaft rocker assemblies and similar polylock rocker systems that use a 7/16in lock nut. The set is built as a universal tool for common adjustable rocker lockdown setups.
Yes. This set sets and locks the adjustment, but you measure the actual clearance with a feeler gauge to the cam manufacturer's spec. We carry feeler gauges to pair with it.
Per retailer specifications, the set is made of steel with plastic grips on the handles for comfort and a secure hold while you apply torque to the lock nut.
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