Bentolin Harmonic Balancer Installer for Chevy 350 SBC & BBC — Threaded-Rod Kit with Thrust Bearing

Bentolin's 66515-style harmonic balancer installer is a heavy-duty threaded-rod kit designed to seat harmonic balancers cleanly on Chevy 350 small-block and big-block crankshafts.

This installer kit replaces part 66515 and provides a simple, reliable way to press a harmonic balancer onto SBC and BBC Chevy 350 cranks without hammering or improvised tools. Built from heat-treated steel with galvanized nuts, an aluminum washer, and a thrust bearing, the set is sized to thread into the crank, then draw the balancer on evenly as you turn the nut. The result is faster, safer assembly and reduced risk of damage to the crank snout or balancer hub.

How does this tool simplify installing a harmonic balancer?

The kit uses a threaded rod that screws into the crankshaft and a nut that pulls the balancer onto the crank in a straight, controlled motion. The included thrust bearing reduces friction so the balancer slides on smoothly without binding or scoring. This removes the need for impact tools or makeshift presses.

• Thread rod engages crank threads for aligned installation
• Thrust bearing minimizes torque and wear during installation
• Galvanized nuts provide corrosion resistance and secure clamping
• Aluminum washer protects the balancer face from marring

Will this fit my Chevy 350 small-block or big-block crank?

The tool is made to work with Chevy 350 SBC and BBC crankshafts that accept a threaded installer. It mirrors the dimensions and function of the common 66515-style installers used in aftermarket and professional shops. Confirm your crank's thread size before purchase to ensure compatibility.

• Designed for Chevy 350 small-block and big-block applications
• Replaces the familiar 66515 installer style and form factor
• Works where crank snout accepts a threaded installation rod
• Check crank thread specification to verify fit

What materials and parts are included, and how durable is it?

Components are manufactured from high-grade heat-treated steel for the rod and galvanized steel for the nut, paired with an aluminum washer and a thrust bearing. The heat treatment and galvanization increase hardness and corrosion resistance, giving the tool a longer service life than untreated hardware. The compact kit packs the core parts needed for repeated shop use.

• Heat-treated heavy-duty steel threaded rod for strength
• Galvanized steel nut for anti-corrosion performance
• Aluminum washer prevents contact damage to the balancer face
• Thrust bearing reduces friction and simplifies turning

How should I use the installer to avoid damage?

Thread the appropriate end into the crankshaft until the rod is firmly seated, position the harmonic balancer on the crank snout, then rotate the nut to draw the balancer on squarely. Use steady, even turns and the thrust bearing will allow the balancer to slide on without hammering. Stop and inspect alignment frequently to avoid cocking the balancer.

• Hand-thread the rod first, then tighten the nut gradually
• Ensure the balancer is straight on the snout before applying force
• Use the thrust bearing to keep turning smooth and even
• Inspect threads and contact surfaces for cleanliness to prevent galling

Who is this for: This Bentolin installer kit is aimed at DIY mechanics, restoration enthusiasts, and professional engine builders who work on Chevy 350 small-block and big-block engines and want a reliable, non-destructive way to fit harmonic balancers. If you prefer using the correct tool for engine reassembly and want to shorten installation time while protecting components, this compact, durable kit is a practical addition to your toolbox.