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Free shipping over $100 · USA & Canada
Free shipping over $100 · USA & Canada
Head & Main Stud Combo Kit For 2006 - 2010 6.6L Chevrolet Duramax LB7 LMM CP877-MP881

Head & Main Stud Combo Kit

6.6L Duramax LBZ / LMM

2006–2010

PART # CP877-MP881

$547.88 - $547.88
$547.88
$547.88 - $547.88
$547.88
Availability:
Low stock
Limited Lifetime Warranty
Free shipping is available on orders over $100 shipping to the USA or Canada.

Why drivers choose XOTIC PERFORMANCE

Secure the head. Support the bottom end.

Pair the head-stud and main-stud kits specified for your engine in one bundle. Each kit retains its own hardware and installation procedure.

Two dedicated stud kits

CP877 head hardware and MP881 main hardware are paired for 6.6L Duramax LBZ / LMM.

Hardware for both assemblies

36 head studs and 10 main studs, with the accompanying hardware listed for each included kit.

Limited Lifetime Warranty

The included fastener kits carry Limited Lifetime Warranty coverage. See the policy for terms.

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

For 6.6L Chevrolet Duramax LBZ and LMM applications. The MP881 main-stud kit limits this bundle to 2006–2010, even though the CP877 head kit is offered for a wider year range.

Engine swap or a custom setup? Confirm your application with our team. Ask XOTIC

Head & Main Stud Combo Kit — 6.6L Duramax LBZ / LMM

Inside the box

Know exactly what arrives.

Included components for this product.

QtyComponent
1 CP877 head-stud kit
36 M12 × 142 mm head studs, 36 nuts, 36 hardened parallel washers and 8 M8 × 97 mm upper-row bolts, with a 5 mm Allen wrench, 10 mm and 16 mm sockets and assembly lubricant.
1 MP881 main-stud kit
10 M14 main studs, 10 nuts, hardened parallel washers and 10 M12 cross bolts, with an Allen wrench, two sockets and assembly lubricant.

Engineering details

Two joints. Defined roles.

Head studs secure the cylinder head to the block. Main studs secure the crankshaft main-bearing caps. Use the hardware and procedure specified for each assembly.

Head and main stud groups Representative head stud and main stud with flanged nuts and washers. Stud lengths, quantities and supplementary hardware vary by kit. This is not an engine installation layout. Head studsMain studsNuts + washers
Representative component groups. See the contents for exact parts and quantities.

Head hardware

The CP877 kit supplies the head studs and accompanying hardware used to secure the cylinder-head assembly.

Main hardware

The MP881 kit supplies the main studs and accompanying hardware used at the crankshaft main-bearing caps.

Keep each procedure with its kit

Stud positions, lubricant requirements and tightening procedures are component-specific. Use the separately labeled installation documents for each included kit.

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. This material comparison relates to the alloy used in the included head and main studs.

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

Material specification

220–240K PSI

Strength specification

The XOTIC 7200 head and main studs in this bundle have a published tensile-strength range of 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

Before you begin

A good install starts here.

Open the instructions for the component you are installing. Each linked document covers the named kit; its procedure and torque values apply to that component.

Before you order

Which kits are included?

This bundle contains one CP877 head-stud kit and one MP881 main-stud kit. The included-kit list identifies their hardware and links to each component.

Does it fit my engine?

For 6.6L Chevrolet Duramax LBZ and LMM applications. The MP881 main-stud kit limits this bundle to 2006–2010, even though the CP877 head kit is offered for a wider year range.

Do both kits use the same installation procedure?

No. The head and main assemblies have separate hardware arrangements and tightening procedures. Use each kit’s labeled manual; do not transfer torque values between them.

What warranty applies?

The included fastener kits carry Limited Lifetime Warranty coverage. See the policy for terms.

California Proposition 65 warning

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

From our customers

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Your build. Our support.

Talk through fitment or installation planning with the XOTIC team.

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