Pro Series 97-03 LS Cylinder Head Hex Bolt Kit

• Fits 1997-2003 LS Engines: Designed for Gen III LS cylinder head applications.

• 190,000 PSI Tensile Strength: Heat-treated 35 chromoly steel construction.

• Hex Head Fastener Design: Provides secure installation and easy serviceability.

• Supports Reliable Head Gasket Sealing: Helps maintain consistent cylinder head clamping force.

Upgrade your engine build with the Top Street Performance Pro Series 97-03 LS Cylinder Head Hex Bolt Kit. Designed specifically for early GM Gen III LS applications, this LS cylinder head bolt kit provides the strength and clamping force needed to help maintain reliable head gasket sealing in street, performance, and racing engines. Whether you're assembling a fresh LS1, replacing cylinder heads, or completing an engine rebuild, these 97-03 LS head bolts provide dependable fastening performance.

Reliable Cylinder Head Clamping Force
Designed to securely fasten the cylinder heads to the engine block, this LS head bolt kit helps maintain consistent cylinder head clamping force and dependable head gasket retention. Ideal for LS engine rebuilds, cylinder head replacement, and performance engine assembly projects.

High-Strength Performance Construction
Manufactured from heat-treated 35 chromoly steel with a minimum tensile strength of 190,000 PSI, these LS cylinder head bolts are built to withstand demanding engine conditions. Threads are rolled after heat treatment and protected with a black oxide finish and oil coating for enhanced durability and corrosion resistance.

Designed for 1997-2003 Gen III LS Applications
Engine-specific design provides compatibility with LS1, LS6, LR4, LM7, L59, LQ4, and LQ9 engine combinations utilizing the 1997-2003 cylinder head bolt configuration. These Gen III LS head bolts are ideal for stock replacement, engine rebuilds, cylinder head upgrades, and LS swap projects.

Ideal for Engine Rebuilds & Head Gasket Service
Perfect for cylinder head installation, head gasket replacement, engine assembly, and performance engine projects where fresh LS cylinder head hardware is recommended. An excellent choice for maintaining proper head gasket sealing and long-term engine reliability in Gen III LS engines.

What engines does this cylinder head bolt kit fit?
This kit is designed for 1997-2003 GM Gen III LS engines, including LS1, LS6, LR4, LM7, L59, LQ4, and LQ9 applications.

Why replace cylinder head bolts during a rebuild?
Replacing cylinder head hardware helps ensure proper clamping force, reliable head gasket sealing, and long-term durability during engine assembly or cylinder head service.

What is the difference between 1997-2003 and 2004+ LS head bolts?
Early Gen III LS engines use a different cylinder head bolt configuration than later LS applications. Always verify your engine's model year and cylinder head application before ordering.

Are these suitable for performance applications?
Yes. The bolts are manufactured from heat-treated 35 chromoly steel with a minimum tensile strength of 190,000 PSI for demanding street and performance use.

What material are the bolts made from?
The kit is manufactured from 35 chromoly steel with rolled threads, a black oxide finish, and a protective oil coating.

What is the advantage of a hex head design?
The hex head design provides straightforward installation and serviceability using common hand tools.

Can these be used during an LS swap?
Yes. This kit is ideal for LS swaps, engine rebuilds, cylinder head replacement, and head gasket service when using compatible 1997-2003 LS engine combinations.

Do these fit 2004-2020 LS engines?
No. This kit is designed specifically for 1997-2003 LS cylinder head applications. Later LS engines require the appropriate 2004+ cylinder head bolt kit.