Xotic Performance Hardened Harmonic Balancer Bolt Kit for GM LS 4.8L–6.2L — 8740 Chrome Steel, Includes Socket & Lubricant

The Xotic Performance Hardened Harmonic Balancer Bolt Kit (CP236) is a drop-in, high-strength replacement designed to secure GM Gen III/IV LS 4.8L–6.2L balancers with included socket and assembly lubricant.

If you service or upgrade Chevrolet GM LS engines, the CP236 bolt kit removes guesswork—providing a precision-fit, hardened 8740 chrome steel bolt, a hardened parallel washer, installation lubricant, and a dedicated socket so you can torque the harmonic balancer correctly. Built for durability and repeatable performance, this kit addresses common failure points of original equipment bolts and simplifies installation for shops and experienced DIYers alike.

How does this bolt improve reliability on high-mileage LS engines?

The CP236 uses 8740 chrome plated steel with a black oxide finish for superior tensile strength and corrosion resistance compared with standard hardware. Its high 200,000 psi rating increases clamping force and resists stretch or fatigue under thermal cycling and vibration.

• 8740 chrome steel construction for maximum tensile strength
• Black oxide coating to reduce corrosion and galling
• Hardened parallel washer to prevent deformation under load
• Engineered for repeated service without compromising thread integrity

Will this fit my GM Gen III/IV LS 4.8L–6.2L engine without modifications?

Yes — the CP236 is manufactured as a direct-fit replacement for Chevrolet GM Gen III and IV LS engines in the 4.8L, 5.3L, 6.0L, and 6.2L displacements. The bolt geometry and washer dimensions match OE mounting surfaces so you won’t need machining or adapters.

• Designed specifically for GM LS 4.8L, 5.3L, 6.0L, 6.2L flange and crank specs
• No alteration of the harmonic balancer or crank required
• Direct-fit kit for straightforward replacement procedures
• Compatible with stock and many aftermarket balancers built to OEM spec

What tools and parts are included, and how does that affect installation?

The CP236 kit arrives with a dedicated socket sized for the bolt head and a tube of assembly lubricant, plus the hardened bolt and washer—so you have the critical items to install the balancer properly. The included 12-point high-head design simplifies access in tight engine bays and helps achieve correct torque with common shop tools.

• Included socket matches bolt head for clean torque application
• Assembly lubricant to ensure correct preload and reduce galling
• 12-point bolt head for improved tool engagement in cramped spaces
• Complete kit reduces trips for missing parts and speeds service time

How does this bolt help when swapping aftermarket balancers or doing engine builds?

During performance builds or balancer swaps, reliable clamping and fatigue resistance are essential to maintain harmonic control. The high-strength bolt and hardened washer in the CP236 minimize the chance of thread stretching or washer flattening under higher loads or repeated assembly.

• Maintains bolt stretch properties for consistent clamp across rebuilds
• Hardened washer prevents crushing on high-torque applications
• Works with many aftermarket balancers that follow OEM mounting standards
• Helps protect crank snout and balancer from damage due to improper hardware

Who is this for: The Xotic Performance CP236 harmonic balancer bolt kit is aimed at mechanics, performance builders, and informed DIYers who work on Chevrolet GM LS-series 4.8L–6.2L engines and want a durable, direct-fit replacement bolt with the parts needed for correct installation. Choose this kit if you need higher strength hardware, worry about corrosion or bolt fatigue, or want the convenience of an all-in-one solution that reduces installation errors.