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Free shipping over $100 · USA & Canada
Free shipping over $100 · USA & Canada
Head Stud Kit - 2001-2016 6.6L Duramax Chevrolet / GMC / Hummer CP877

Head Stud Kit

Chevrolet / GMC / Hummer Duramax · 6.6L

2001–2016

PART # CP877

$368.88 - $368.88
$368.88
$368.88 - $368.88
$368.88
Availability:
in stock, ready to be shipped
Free shipping is available on orders over $100 shipping to the USA or Canada.
Seal the Power. Drive with Confidence.

Your truck deserves strength you can count on. This head stud kit is built for street-driven and moderately modified builds, giving you dependable sealing and confidence whether you’re daily driving, towing, or adding small performance upgrades.

Why Drivers Choose XOTIC PERFORMANCE™

  • Everyday Confidence – Keeps your head gasket sealed during normal use and light performance mods.

  • Trusted Reliability – Prevents common sealing issues so you can focus on the road, not repairs.

  • All-In-One Kit – Includes studs, washers, and nuts, for a secure, hassle-free install.

  • Durability That Lasts – Precision-machined and finished to resist wear and corrosion.

  • Limited Lifetime Warranty – Backed by XOTIC PERFORMANCE™ for total peace of mind.

Perfect for drivers who want proven reliability without going overboard — this kit is your upgrade for everyday dependability.

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 Stud Kit - 2001-2016 6.6L Duramax Chevrolet / GMC / Hummer

Inside the box

Know exactly what arrives.

Included components for this product.

QtyComponent
36 M12 × 142 mm head studs
36 Nuts
36 Hardened parallel washers
8 M8 × 97 mm upper-row bolts
2 Sockets · 10 mm and 16 mm
1 5 mm Allen wrench
1 Fastener assembly lubricant

XOTIC 7200 / Material comparison

Tensile & yield strength.

Two measures of strength. Explore the comparison for XOTIC 7200 alloy and 8740 chromoly steel.

Tensile strength

The maximum tensile stress a material withstands before failure.

Original tensile comparison diagram: XOTIC 7200, 232K PSI, in solid blue; 8740 chromoly steel, 222K PSI, in dashed graphite.
Existing material comparison illustration. Not a product-specific kit test.
XOTIC 7200 series

232K PSI

8740 chromoly steel

222K PSI

Yield strength

The stress at which a material begins to deform permanently.

Original yield comparison diagram: XOTIC 7200, 212K PSI, in solid blue; 8740 chromoly steel, 201K PSI, in dashed graphite.
Existing material comparison illustration. Not a product-specific kit test.
XOTIC 7200 series

212K PSI

8740 chromoly steel

201K PSI

The original comparison identifies an M14 × 237 specimen.

Original method note: ISO 6892-1:2016 or ASTM A370 / ASTM E8/E8M in the US.

Material specification

220–240K PSI

Strength specification

The published tensile-strength range for XOTIC 7200 head studs is 220,000–240,000 psi. Tensile strength describes the material under tension; it is not an installed clamping-force or horsepower rating.

View the test documentation

The linked ATRONA report records a 240,000 psi tensile result for a submitted stud tested in May 2020. This result applies to the submitted sample.

View source report

See the details

Behind the product.

Watch the video selected for this product.

XOTIC videoWatch on YouTube

05 / Understand the connection

How a head stud works.

The stud stays in tension. The head and gasket stay clamped. See how the parts work together.

Inside the connection
A head stud in cross-section A blue stud threads into the engine block and passes through a clearance hole in the cylinder head. A nut and washer sit above the head. Tightening the nut stretches the stud slightly and compresses the head and gasket against the block. White arrows show tension in the stud; blue arrows show the clamping forces on the joint. 3 4 2 1 5 6
Stud tension · Joint compression
  1. Nut
  2. Washer
  3. Cylinder head
  4. Head gasket
  5. Engine block
  6. Head stud
Stud tensionClamping force

Before you begin

A good install starts here.

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

Download installation manual

Before you order

Will this fit my vehicle?

Use the vehicle checker above to confirm your exact application. For an engine swap or unusual setup, contact XOTIC before ordering.

Are tools and assembly lubricant included?

Yes. See the What’s included list above for the tools and assembly lubricant supplied with this kit. Follow the kit’s instructions for preparation and any additional equipment required for the complete job.

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

From our customers

Reviews from real customers.

Customer feedback on this product, powered by Judge.me.

1,637reviews across XOTIC
4.83 / 5
Overall Judge.me rating

The wider XOTIC community

More builds. More perspectives.

Explore feedback from customers across the XOTIC range.

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Your build. Our support.

Talk through fitment or installation planning with the XOTIC team.

Ask XOTICFind an Installer or Dealer