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Free shipping over $100 · USA & Canada
Free shipping over $100 · USA & Canada
Main Stud Kit For 2001 - 2005 6.6L Chevrolet Duramax LB7 LLY MP877

Main Stud Kit

6.6L Chevrolet Duramax LB7 / LLY

2001–2005

PART # MP877

$253.28 - $253.28
$253.28
$253.28 - $253.28
$253.28
Availability:
in stock, ready to be shipped
Free shipping is available on orders over $100 shipping to the USA or Canada.

These are main studs, not head studs. Main and head studs serve different purposes—selecting the right one is crucial.

Why Main Studs? 

Main studs provide superior clamping force compared to main bolts, reducing wear on block threads and assisting with main cap alignment. Unlike bolts, which twist during tightening, studs remain stationary, reducing the chance of main cap walking under high loads. They are especially beneficial in high-performance applications where increased stability and durability are required.

Disclaimer: Designed to secure crankshaft main bearing caps. This is NOT a head stud kit.

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
Main Stud Kit - 2001-2005 6.6L Chevrolet Duramax LB7 LLY

Inside the box

Know exactly what arrives.

Included components for this product.

QtyComponent
10 M14 Main Studs
10 Nuts
— Washers
10 M12 cross bolts
1 Allen Wrench
1 Fastener Assembly Lubricant
2 Sockets

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 main 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

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 fit my vehicle?

Confirm the LB7 or LLY Duramax application. Use the vehicle checker above to confirm your exact application. For an engine swap or an unusual setup, contact XOTIC before ordering.

Are tools and assembly lubricant included?

Yes. The included sockets, Allen tools and assembly lubricant are listed in the kit contents. Check the installation procedure for any additional equipment needed for the complete job.

Should the main bearing bores be checked?

Yes. Check the main bearing bores for size, roundness and alignment after changing the fasteners. If correction is needed, have the machine shop use the final assembly fasteners, lubricant and specified torque when checking and machining the main tunnel.

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

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Your build. Our support.

Talk through fitment or installation planning with the XOTIC team.

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