Moker Harmonic Balancer Installation Kit 66515 LS — Threaded Installer for Chevy SBC/BBC with Thrust Bearing

The Moker 66515 LS harmonic balancer installation kit is a purpose-built threaded-puller/press tool that makes seating balancers on Small Block and Big Block Chevy crankshafts fast, safe, and accurate.

When fitting a harmonic balancer on SBC or BBC engines, correct alignment and controlled pressure are essential to avoid damaging the crank snout or the balancer’s hub. The Moker 66515 kit gives you the threaded interface and thrust-bearing assembly needed to draw the balancer squarely onto the crank by turning a nut rather than hammering. It’s a compact, reusable solution for engine builders, backyard mechanics, and shops that work on Chevrolet V8s.

How does this kit install a harmonic balancer without harming the crank?

The kit uses a threaded rod and nut to pull the balancer onto the crank taper with steady, even force so parts stay aligned. A thrust bearing reduces friction while you tighten, minimizing torque spikes and protecting threads. Because the balancer is drawn in rather than driven, the risk of chipping the snout or deforming the balancer is greatly reduced.

• Threaded ends: 5/8-16 and 7/16-16 to fit common Chevy crank threads
• Includes thrust bearing to lower friction during installation
• Applies controlled axial pressure—no hammer impacts

Which Chevy engines and crankshaft threads are supported?

This tool was designed for both Small Block Chevy (SBC) and Big Block Chevy (BBC) crankshaft applications; the dual-threaded rod covers the most frequent factory thread sizes. You can switch which end threads into the crank depending on your engine’s original thread. The kit works with aftermarket and OE-style harmonic balancers that match those crank thread standards.

• Compatible with SBC and BBC Chevrolet crank snouts
• Supplied threads: 5/8-16 and 7/16-16
• Suitable for OE and most aftermarket balancers using those threads

What comes in the Moker 66515 kit and what are the materials?

The kit ships complete so you won’t need extra adapters for standard Chevy balancer installs: a threaded rod, nut, washers, and the thrust bearing are included. Components are steel for durability and repeated use in a shop environment. Moker backs the tool with a 90-day limited factory warranty for added confidence.

• Contents: 1 threaded rod, 1 nut, selection of washers, 1 thrust bearing
• Construction: high-strength steel for longevity
• Warranty: 90-day limited factory coverage

How do I use the tool step-by-step safely?

Thread the correct end into the crank, position the balancer on the crank snout, place the thrust bearing and washers against the balancer face, then tighten the nut to pull the balancer on evenly. Stop periodically to check alignment and seating depth rather than forcing full torque in one go. Use proper hand tools or a torque wrench as appropriate, and follow engine manufacturer clearance specs.

• Choose the correct thread end and hand-thread into the crank
• Slide balancer onto crank snout and center it by hand first
• Assemble thrust bearing/washers and tighten nut gradually while checking seating

Who this is for: The Moker 66515 LS harmonic balancer installation kit is suited to home mechanics, performance builders, and repair shops that service Chevy Small Block and Big Block V8s. If you frequently remove and install balancers or need a safer, repeatable method than hammering, this compact steel kit provides a reliable, affordable way to seat balancers correctly.