YZQPNB 12-Point Head Stud Bolt Kit for GM LS Engines (2004–2019) — 8740 Chromoly, Black Oxide

YZQPNB's 12-point head stud bolt kit is a complete direct-replacement fastener set engineered to install and secure cylinder heads on 2004–2019 GM LS-series V8 engines.

This kit supplies a full complement of hardened chromoly studs, 12-point nuts and precision washers designed specifically for many LS1, LS3 and other 4.8L–6.0L GM engines. It replaces part number 234-4317 as a non-OEM direct-fit option and is built to improve clamping consistency during head torqueing and repeated service. All components are manufactured from 8740 high-tensile chromoly steel with a black oxide finish, and washers are parallel-ground to distribute load evenly and give reliable torque readings.

Will this kit fit my 2004–2019 Chevy LS engine?

Yes — the kit is intended as a direct replacement for many GM small-block LS applications spanning 2004 through 2019. It lists compatibility with LS1, LS3 and other common 4.8L, 5.3L, 5.7L and 6.0L engine variants.

• Designed to replace part 234-4317 (non-OEM alternative)
• Compatible with LS1, LS3, LS6, L98 and other referenced GM engines
• Fits 4.8L, 5.3L, 5.7L and 6.0L cylinders as stated

How is the kit built to withstand repeated engine service?

The studs and nuts are made from 8740 chromoly steel and undergo quality checks for strength and dimensional accuracy. Components receive a black oxide surface finish for corrosion resistance and consistent torque behavior.

• Hardened chromoly studs for high tensile strength
• Parallel-ground washers to ensure even clamping and accurate torque readings
• 12-point nuts for positive engagement with common torque tools

What exactly is included in the package?

The kit provides everything required to replace cylinder head fasteners for typical LS head installations, so you’ll have the proper count of studs, nuts and washers for an overhaul or service job.

• 10 M8 studs (shorter studs supplied where needed)
• 20 M11 head studs sized for LS head applications
• 30 parallel-ground washers for uniform load transfer
• 30 12-point nuts to match the studs and simplify torque steps

Do I need any special tools or preparation to install these studs?

Installation follows standard head-stud replacement procedures: clean threads, follow torque sequence, and use a calibrated torque wrench. No proprietary tools are required, but thread prep and correct torque values for your specific engine are essential.

• Use thread chaser or clean existing threads before assembly
• Follow manufacturer torque sequence and specified torque steps
• Calibrated torque wrench and 12-point socket set recommended

Who this is for: Mechanics, engine builders and DIY enthusiasts who need a robust, cost-effective replacement for worn or damaged GM LS-series head bolts will find this kit useful. It’s targeted at professionals and home mechanics working on 2004–2019 LS1/LS3 and similar 4.8L–6.0L engines who want a high-strength chromoly solution with parallel-ground washers for reliable clamping and repeatable torque readings. If you require a genuine OEM fastener, check factory sources; otherwise this kit provides complete hardware for most LS head installations. For any questions or support regarding fitment or installation, contact the seller so issues can be addressed promptly.