ARP 230-2901 Chromoly Flexplate Bolt Kit for 2001-10 6.6 L Duramax Diesel

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Product Specification:

SKU:ARP230-2901

MPN: 230-2901

UPC: 672036039196

Weight: 2.0 lb

Type: Hardware Kits - Other

Vehicle Fitment

2001-2012 Chevrolet / GMC 6.6 L Duramax Diesel (LB7, LLY, LBZ, LMM)

Features

Chromoly aerospace-grade bolts rated for high strength
12-point head design for maximum torque accuracy
Flat under-head radius increases register with flexplate
Centerless-ground shank for precise seating and alignment
Black oxide coating for corrosion resistance
Higher yield strength than OEM fasteners to resist stretching or loosening
Designed specifically for diesel flexplate applications
Reusable hardware with proper torque procedure

Specifications

Thread Size: M16 x 1.50
Under-head Length (UHL): 1.775"
Socket/Drive: 5/8" 12-point
Material: 8740 chromoly steel
Finish: Black oxide
Torque Specs: 100 ft-lbs + 75° or 250 ft-lbs (per ARP procedure)
Washers: Not required / not to be used

Included Components

8x Flexplate bolts (M16, 12-point)
ARP assembly lubricant
Installation instruction sheet

Product Description

The ARP 230-2901 Flexplate Bolt Kit is engineered for the 6.6 L Duramax diesel engines, specifically the LB7, LLY, LBZ, and LMM variants from 2001 to 2012. This kit replaces the OEM flexplate bolts with high-strength chromoly bolts and a flat 12-point head, delivering superior durability and clamping force under extreme torque loads.

With an under-head length of 1.775", the bolts provide an optimized fit for the flexplate while ensuring proper seating and alignment. The black oxide finish offers good corrosion resistance, and the precision ground shank ensures even load distribution during installation. Follow the ARP torque procedure - either sequential torque to 100 ft-lbs plus 75°, or torque up to 250 ft-lbs - for the best results. These bolts are ideal for performance or high-stress use in diesel engines, and with correct installation, they can be reused reliably.