Michigan Motorsports LS Head Bolt Kit | Fits 1997-2003 LS1 LS6 LQ4 LQ9 LM7 LR4 4.8L 5.3L 5.7L 6.0L | Replaces GM #12498545 | Premium Cylinder Head Bolt Set

The Michigan Motorsports LS Head Bolt Kit is a direct replacement for GM part number 12498545 and is designed specifically for 1997–2003 LS engines. Built to meet or exceed OEM specifications, these torque-to-yield bolts provide the clamping force necessary to keep your cylinder heads sealed under stock and performance conditions. Perfect for rebuilds, head gasket replacements, or top-end upgrades, this kit offers complete coverage for LS1, LS6, LQ4, LQ9, LM7, and LR4 platforms. Whether refreshing a high-mileage daily driver or assembling a street/strip build, Michigan Motorsports delivers the OEM-quality hardware you can trust.

• OEM Replacement for GM 12498545 – Direct-fit head bolt kit for 1997–2003 LS engines, ensuring factory-level reliability and performance.
• Complete Cylinder Head Bolt Set – Includes all the torque-to-yield bolts required to fasten both cylinder heads, eliminating the need to piece together hardware separately.
• Built for Stock & Performance Applications – Provides the clamping force necessary to secure cylinder heads under daily driving or high-performance conditions.
• High-Strength Construction – Manufactured to meet or exceed OEM tensile strength and torque specifications, ensuring consistent performance and long-term durability.
• Wide LS Engine Compatibility – Fits 4.8L, 5.3L, 5.7L, and 6.0L LS engines including LS1, LS6, LQ4, LQ9, LM7, and LR4, making it versatile for many GM builds.