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Free shipping over $100 · USA & Canada
Free shipping over $100 · USA & Canada
Head Bolt Kit For 2004 - 2014 Chevrolet Gen III/IV LS XP981

Head Bolt Kit

Chevrolet Gen III/IV LS · Hex 6-Point

2004–2014 applications

PART # XP981

For engines with same-length primary head bolts. Does not fit applications with two different primary bolt lengths.

$106.37 - $106.37
$106.37
$106.37 - $106.37
$106.37
Availability:
in stock, ready to be shipped
Free shipping is available on orders over $100 shipping to the USA or Canada.

Please note - primary head bolts must all have the same length. There is a Mid-Year split on the head bolts, if you have 2 different size head bolts this kit is NOT for YOU. 

DO NOT PURCHASE until you have verified the primary head bolt length. 

Please note, when installing our product, the final torque for the 11mm bolts are 80 ft-lbs and NOT 85 ft-lbs as incorrectly noted on our manual

ULTRA STRENGTH

In comparison to standard bolts, our alloy's material characteristics enable much higher tensile strength. For the best fatigue strength, threads are rolled after thermal treatment. A high-quality coating can improve corrosion resistance, reduce friction, and improve overall performance.

EASY INSTALLATION
Installation manual is included with drawn diagrams to ease the installation process. Our head bolts are designed to retain cylinder seal even with today's extremely high-pressure turbo systems. 
PREMIUM QUALITY
Black oxide finish protects from wear and tear. Hardened parallel washers allow for uniform load distribution and accurate torque readings.

Your application

The right fit comes first.

Browse the compatible applications below, or check your exact vehicle before adding this product to your cart.

Check my vehicle
Head Bolt Kit - 2004-2014 Chevrolet Gen III/IV LS

Inside the box

Know exactly what arrives.

Included components for this product.

QtyComponent
30 Hex head bolts
M11 × 113.7 mm and M8 × 57 mm; combined total.
30 Hardened parallel washers
W0703 and W0202; combined total.
2 Sockets
10 mm and 13 mm.
1 Fastener assembly lubricant

Engineering details

Small details. A secure assembly.

The bolt head bears on a hardened washer while the threaded end engages the engine block. Tightening the bolt creates the clamping load that holds the cylinder head and gasket against the block.

How head bolts secure the cylinder head An integral bolt head bears on a washer above the cylinder head. The bolt passes through the head and gasket and engages threads in the engine block. Blue arrows show clamping force. Bolt head Washer Cylinder head Head gasket Engine block Block threads
Simplified cross-section. Bolt style and proportions vary by kit.

XOTIC 7200 alloy.

Alloy steel head bolts with a black oxide finish, paired with hardened parallel washers.

Threads rolled after treatment.

The bolt threads are rolled after thermal treatment as part of the manufacturing process.

A matched seating surface.

Hardened parallel washers sit beneath the bolt heads and distribute load across the seating surfaces. Use the supplied assembly lubricant with the correct procedure for your kit.

Before you begin

A good install starts here.

Review the instructions and any application-specific requirements before you begin.

Read installation guide Download installation manual

Before you order

Will this kit fit my engine?

For compatible 2004–2014 Chevrolet Gen III/IV LS engines with same-length primary head bolts. GM has a mid-year bolt-length split; compare the original primary bolts before ordering. This kit does not fit engines with two different primary bolt lengths.

Does this kit use bolts or studs?

This kit uses head bolts with integral heads and hardened parallel washers. Separate studs and retaining nuts are not included.

Which bolt sizes are included?

The kit contains 30 bolts in total across M11 × 113.7 mm and M8 × 57 mm sizes, with 30 hardened parallel washers. The two sockets are 10 mm and 13 mm.

Which installation instructions should I follow?

Use the linked current installation manual and its tightening sequence. The final torque for the 11 mm bolts is 80 ft-lb; an older printed manual incorrectly listed 85 ft-lb.

How does the warranty work?

Review the warranty policy for coverage, eligibility, and claim requirements.

Read warranty termsRegister your warranty
California Proposition 65 warning

WARNING: Cancer and Reproductive Harm. www.P65Warnings.ca.gov

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