ARP 230-4201 Head Stud Kit for 2001-2016 GM 6.6 L Duramax (LB7/LLY/LBZ/LMM/LML)

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In Stock: 60

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Product Specification:

SKU:ARP230-4201

MPN: 230-4201

UPC: 672036032678

Weight: 12.2 lb

Inventory: 60

Type: Head Stud & Bolt Kits

Vehicle Fitment

2001-2016 GM 6.6 L Duramax Diesel (LB7, LLY, LBZ, LMM, LML)

Features

Proprietary ARP2000® alloy, cold-forged and heat-treated for exceptional strength
Thread-rolled after heat treat for superior fatigue resistance
Centerless ground for precise concentricity
Shot-peened and black oxide coated for durability and corrosion resistance
Broached stud ends simplify cylinder head removal in tight engine bays
Includes hardened parallel-ground washers for accurate torque application
Comes with ARP Ultra-Torque assembly lubricant for proper preload
Prevents head lift under high-combustion pressure typical in diesel applications

Specifications

Material: ARP2000® alloy steel
Tensile Strength: 220,000 psi
Socket Sizes: 5/8" 12-point, 10 mm 12-point, 5 mm Allen
Finish: Black oxide
Quantity: Complete kit for both heads (studs, nuts, washers)
Drivetrain Compatibility: Fits GM Duramax engines; drivetrain independent

Included Components

1x Full set of head studs (quantity varies by engine)
Corresponding 12-point nuts
Hardened parallel-ground washers
1x ARP Ultra-Torque assembly lubricant packet
Installation instructions

Product Description

The ARP 230-4201 Head Stud Kit is purpose-built for the GM 6.6 L Duramax engines (LB7, LLY, LBZ, LMM, LML) used from 2001 to 2016. This kit replaces OEM torque-to-yield head bolts with premium ARP2000® alloy studs, offering dramatically higher clamp force and reliability - especially critical in high-boost or heavy-duty diesel applications.

Engineered for longevity, each stud is cold-forged and heat-treated before precision centerless grinding and thread rolling. Broached ends facilitate head removal in tight clearances, while black oxide coating and shot-peening enhance durability. Complete with ARP Ultra-Torque lubricant, hardened washers, and nuts, this kit ensures consistent torque accuracy and superior sealing under extreme pressure.

For performance builds, towing, or high-stress engine operations where head gasket integrity is paramount, the ARP 230-4201 Head Stud Kit delivers industry-leading strength and peace of mind.