PQY 12-Point Cylinder Head Stud Bolts Kit – Chromoly Steel 180K PSI – For Chevy LS1 / LS3 / LS6 / L98 (4.8L 5.3L 5.7L 6.0L) Engines 2004-2019

Description

The PQY 12-Point Cylinder Head Stud Bolts Kit is the upgrade serious LS-platform builders trust for high-boost, high-compression, and high-RPM engine builds across the GCC. Constructed from 8740 high-tensile chromoly steel with a 180,000 PSI rated tensile strength, these studs deliver the consistent clamping force required to prevent head lift under the brutal pressures of forced induction or aggressive nitrous setups — a critical upgrade for any LS swap, drag build, or performance Camaro / Corvette / Silverado / Trailblazer SS project popular in the UAE tuning scene. The 12-point head and large-area flange design eliminate the need to disassemble the valve mechanism for cylinder head torquing and accommodate larger-diameter valve springs. The black oxide finish provides excellent corrosion protection and high-temperature resistance, while the parallel-ground washers ensure uniform load distribution and accurate torque readings. As a direct replacement for ARP part number 234-4317, this kit fits 2004-2019 Chevy LS1, LS3, LS6, and L98 engines (4.8L, 5.3L, 5.7L, 6.0L). Package includes 10 x M8 studs, 20 x M11 head studs, 30 x parallel-ground washers, and 30 x 12-point nuts. Torque specs: M11 at 70 ft-lbs, M8 at 25 ft-lbs.

Instructions:

1. Drain all engine coolant and ensure the engine is completely cool before starting.
2. Remove the old head bolts following the reverse of the factory torque sequence.
3. Clean the head bolt holes thoroughly — any oil or debris will affect torque accuracy.
4. Apply ARP Ultra-Torque assembly lubricant to the threads and washer faces.
5. Install the M11 head studs and torque to 70 ft-lbs in the factory sequence; torque the M8 studs to 25 ft-lbs.

Precaution:

Engine work involves complex internal components — professional installation by a certified mechanic is strongly recommended to prevent engine damage.