12pt (Street) Thermostat Housing Bolt Kit

Features:

• High strength stainless steel construction
• 12 point head for improved tool access
• Fits Duramax LB7 through LBZ engines
• Designed for thermostat housing applications
• Resists corrosion in cooling system environments
• Provides consistent clamping force for sealing
• Precision rolled threads for accurate torque
• Reusable hardware for long term service
• Direct fit with no modifications required
• Ideal for maintenance and cooling system upgrades
• Trusted ARP quality and engineering

Upgrade Your Cooling System Hardware With Confidence And Clean Fitment

When you are working on your Duramax, it is the small details that can make or break a clean and reliable setup. This ARP thermostat housing bolt kit is one of those upgrades that instantly gives you more confidence every time you button things up. Right away, you get better clamping force than factory hardware, which helps keep the thermostat housing sealed tight and free from annoying coolant leaks. Additionally, the 12 point head design makes installation smoother, especially when you are dealing with tight spaces around the front of the engine. It is a simple swap, but one that adds long term value whether you are refreshing your cooling system or doing a deeper engine service. What’s more, the corrosion resistant construction holds up against heat and coolant exposure, so you are not dealing with rusted or worn bolts down the road. This is the kind of upgrade that keeps your engine bay looking clean while also improving reliability. Once installed, it is one less thing you have to worry about every time you pop the hood.

Precision Fastener Design Built For Duramax Cooling System Reliability

The ARP 130-7403 thermostat housing bolt kit is engineered for GM 6.6L Duramax engines from LB7 through LBZ, ensuring proper fitment and consistent performance. Each fastener is manufactured using high quality stainless steel, which provides excellent resistance to corrosion in coolant exposed environments. Furthermore, the threads are precision formed to deliver accurate torque readings, helping achieve proper preload during installation. This is critical for maintaining even clamping force across the thermostat housing, which directly impacts gasket sealing and long term durability. The 12 point head design allows for improved tool engagement, reducing the risk of rounding while also making access easier in confined areas. Additionally, the bolts are designed to be reusable, making them a dependable choice for future maintenance or upgrades. This kit is ideal for both stock applications and modified builds where reliability is a priority. Altogether, it delivers a well engineered fastening solution that supports consistent cooling system performance.

Fitment: 2001, 2002, 2003, 2004, 2005, 2006, 2007 GM Sierra/Silverado 2500HD/3500HD 6.6L Duramax LB7/LBZ

Notes:

• Fits Duramax LB7 through LBZ engines only
• Designed specifically for thermostat housing use
• ARP thread lubricant recommended for installation
• Follow ARP torque specs for proper sealing
• Not intended for other engine applications
• Ensure mating surfaces are clean and flat
• Inspect gasket or seal before reinstalling
• Proper torque sequence helps prevent leaks
• Ideal for cooling system service or upgrades
• Compatible with stock and aftermarket housings
• Allow engine to cool before installation