Chevy Duramax diesel '05 & earlier LB7/LLY main stud kit
Applications
Chevrolet - Diesel Duramax
Chevrolet Duramax
GMC Diesel
GMC Duramax
Installation Instructions
Automotive Racing Products
Tel (805) 339-2200
1863 Eastman Avenue.
Fax (805) 650-0742
Ventura, Ca. 93003 www.arp-bolts.com
INSTALLATION METHOD FOR MAIN STUD KITS
Part Number: 230-5401 & 230-5402 Application: Chevy 6.6L Duramax Diesel
1. To ensure proper thread engagement and accurate torque readings, clean ALL threads in the block. Chase the
threads if necessary with a Thread Chaser.
2. Clean and inspect all hardware prior to installation. Look for obvious defects or shipping damages, plus proper fit,
length and dimension.
3. Screw the studs into the block “HAND TIGHT ONLY”.
NOTE: LOCTITE MAY BE USED IF A PERMANENT MOUNTING OF THE STUDS IS PREFERRED.
THE FASTENERS, HOWEVER, MUST BE TORQUED PRIOR TO THE LOCTITE SETTING UP.
4. Install the main caps and check for binding or misalignment.
5. Lubricate the stud threads and the nuts with ARP ULTRA-TORQUE FASTENER ASSEMBLY LUBRICANT. Then
install the nuts onto the studs and tighten them hand tight. Loosely install the cross bolts with the chamfered side
of the washer facing the head of the bolt. ARP recommends using the ARP ULTRA-TORQUE FASTENER
ASSEMBLY LUBRICANT that is provided with each kit as opposed to motor oil. This is due to higher
friction on the studs as well as inconsistencies in the clamping force of the fasteners when motor oil or
other low quality lubricants are used.
PRELOAD (TORQUE) RECOMMENDATIONS
6. Following the manufacturers recommended torque sequence tighten the nuts and bolts in three equal steps to
the specifications listed below with ARP ULTRA-TORQUE FASTENER ASSEMBLY LUBRICANT.
M14 studs 175 ft lbs M12 cross bolts 90 ft lbs
FOOTNOTE: When changing from factory fasteners to high strength fasteners, clamping force and tolerances will
change, therefore it will be necessary to check the main bearing bores for proper size and out of round condition after
installation of the studs and align hone the cylinder block if necessary. The main bores should always be align honed
using the same fasteners and lubricant which will be installed during final engine assembly at the recommended preload.
⚠ This is an automatically generated translation and unit conversion. Always refer to the original ARP instruction sheet for exact specifications. Errors may occur. 
