Damper Bolt Kit - LS1 Y-Body 8 Groove

The ATI Performance Damper Bolt Kit for LS1 Y-Body 8-groove harmonic balancers is a precision fastening solution engineered for small-block Chevy engine builders and street/strip mechanics. This kit delivers the correct fastener specification for secure damper attachment, eliminating guesswork during engine assembly and ensuring proper harmonic balancer retention under load.

The kit includes 5/16-18 thread bolts with a Torx pan head design, sized at 1.000 to 2.000 inches in length, and finished in black oxide steel for corrosion resistance and durability in engine bay conditions. The black oxide coating provides both protection against rust and a professional appearance on visible fasteners. Torx drive geometry prevents cam-out during installation, critical when torquing fasteners on expensive dampers where bolt damage could result in costly rework. The 5/16-18 thread specification is the OEM standard for LS1 damper attachment, ensuring compatibility with factory service procedures and technical documentation.

This kit serves engine builders, performance shops, and experienced DIY builders performing LS1 engine assembly, rebuilds, or damper replacement. Whether working on a first-time street engine, a road-race platform, or a drag racing application, correct damper fastening is non-negotiable—improper bolts or installation can lead to damper slip, crank damage, or catastrophic engine failure. ATI Performance's kit eliminates the risk of substituting undersized or incorrect fasteners by providing the exact specification in one package.