Michigan Motorsports LS Main Bolt & Stud Kit — Fits 1997–2013 LS Engines, High‑Strength Steel Restores Factory Torque

Heavy-duty replacement main bolts and studs engineered to restore factory torque, reinforce the bottom end, and stabilize crankshaft alignment in 1997–2013 LS engines.

This Michigan Motorsports LS Main Bolt & Stud Kit is a complete fastener set designed to replace worn factory main bolts while adding main studs where extra reinforcement matters most. Built from high-strength steel, the kit restores proper clamping force and helps prevent main cap walk, stretched bolts, and bearing misalignment — problems that commonly arise in aging or high-stress LS V8s. It fits a broad range of LS variants (4.8L–6.2L, LS1–LS3, LQ4, LM7, LC9, LR4, L96, L76) and suits both stock rebuilds and performance builds with forced induction or high RPM use.

How does this kit improve crankshaft stability?

By replacing fatigued factory bolts and adding studs in key positions, the kit increases clamping consistency and distributes load across main caps more evenly. The result is reduced lateral movement of the main caps and better crankshaft alignment under load.

• Main studs replace specific bolts to reduce main cap walk.
• High-strength steel resists stretch and preserves torque settings.
• Restoring factory torque specs improves bearing alignment and longevity.

Will this fit my LS engine and what models does it support?

The kit is made as a direct replacement for factory main hardware used across many Gen III/IV Chevrolet LS engines produced from 1997 through 2013. It covers common displacements and platform codes used in cars and trucks, making it a versatile option for swaps and rebuilds.

• Compatible with 4.8L, 5.3L, 5.7L, 6.0L, and 6.2L LS-series engines.
• Fits LS1, LS2, LS3 and truck engine codes like LQ4, LM7, LC9, LR4, L96, L76.
• Designed for direct-fit installation using factory-size locations and torque specifications.

Is this kit suitable for forced-induction or high-RPM builds?

Yes — the added studs and premium steel construction increase the bottom-end's ability to tolerate extreme loads typical of turbocharged, supercharged, or high-revving engines. They don’t change internal geometry but they do maintain consistent clamp and alignment under harsh conditions.

• Improved load distribution reduces risk of bearing misalignment under boost.
• High-strength materials resist thermal and torque-induced deformation.
• Recommended when upgrading to higher horsepower or forced-induction setups.

How do I use this kit during a rebuild or swap?

The kit is intended to be installed in place of worn main bolts and to install studs where noted in build guides. Always follow service manual torque procedures and use appropriate thread prep or locking methods as specified for the engine application.

• Replace all factory main bolts with supplied hardware where required.
• Install studs in designated locations and torque to specification per manual.
• Use proper thread locker or sealant only if the build manual calls for it.

Who is this for: Engine builders, hot-rodders, and mechanics doing LS rebuilds, swaps, or power upgrades who want to restore factory clamping force while adding reinforcement for high-stress use. Whether refreshing a daily-driven truck, preparing a high-horsepower street/track engine, or assembling a forced-induction LS swap, this Michigan Motorsports kit supplies robust, direct-fit fasteners to help protect the crank, mains, and bearings from the consequences of worn or inadequate main hardware.