PQY Cylinder LS Head Studs Kit for Chevy 97-03 5.3L/6.0L — 12-Point, 220K PSI Tensile Strength

PQY Cylinder LS Head Studs Bolts Kit is a direct-fit 12-point head stud and bolt set engineered to replace worn factory fasteners on 1997–2003 Chevy LS engines, delivering higher tensile strength and durable corrosion resistance.

This PQY kit is purpose-built for classic GM LS applications — including 98–02 Camaro/Firebird F-bodies, 97–03 C5 Corvettes, and 99–03 Silverado/Sierra trucks with 4.8L, 5.3L, and 6.0L engines. Each component is manufactured and treated to withstand high temperatures and repeated torque cycles, making it a solid upgrade when you need robust clamping and long-term reliability. The kit contains all the studs, bolts, washers, and 12-point nuts required for a complete replacement, simplifying installation for professional mechanics and experienced DIYers alike.

How does this kit improve clamping strength compared with stock head bolts?

PQY head studs are centerless-ground and heat-treated prior to thread rolling, producing a nominal tensile strength of around 220,000 psi. That higher tensile rating and the use of studs (rather than single-piece bolts) yields more consistent clamping across the head and reduces the risk of fastener yield during high-stress use.

• 220K psi nominal tensile strength for improved durability
• 12-point nuts for even torque application
• M11 studs for main head locations, M8 for accessory positions

What hardware is included and how many of each part will I get?

The kit supplies every fastener needed to do a full head-stud replacement on compatible LS engines—organized so you can identify each size during assembly. If an item is missing, PQY customer support offers replacement assistance.

• 20 × M11 head studs (main studs)
• 10 × M8 head studs (secondary studs)
• 30 × parallel-ground washers for consistent seating
• 30 × 12-point nuts for secure, repeatable torquing

Are these studs easy to install for a DIY mechanic?

Yes — the PQY package is designed as a direct replacement for corroded or stretched original fasteners and fits the specified Chevy LS model years without modification. Basic engine disassembly skills, a proper torque wrench, and following the vehicle’s torque sequence are required for correct installation.

• Direct-fit for listed Camaro/Firebird, Corvette, Silverado/Sierra models
• Follow manufacturer torque specs: M11 ~80 ft-lbs, M8 ~28 ft-lbs
• Use provided washers to ensure parallel seating and torque accuracy

What materials and finishes are used and why do they matter?

Components are manufactured from ductile iron and treated with a black oxide finish to resist corrosion and tolerate elevated under-hood temperatures. Heat treatment and precision thread rolling give the studs consistent mechanical properties and longevity under repeated thermal cycles.

• Ductile iron construction for toughness and fatigue resistance
• Black oxide surface for rust resistance and heat tolerance
• Centerless-ground bores and rolled threads for precise fit

Who is this for: This PQY Cylinder LS Head Studs Bolts Kit is intended for vehicle owners, professional technicians, and engine builders working on 1997–2003 Chevy LS platforms who want a reliable, higher-strength replacement for worn or corroded head fasteners. It's especially useful for those restoring F-body cars, upgrading C5 Corvettes, or maintaining Silverado/Sierra trucks where consistent head clamping and long-term durability are priorities. If you require matching torque values, repeatable assembly, and a full set of studs, washers, and nuts in one package, this kit provides a convenient, application-specific solution.