Product Code: 040-HSP-X

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2001-2005 Chevrolet / GMC Billet Thermostat Housing Kit

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*This Thermostat housing is to be used when running a aftermarket turbo charger in the valley with no cooling previsions

Many of the Chevy Duramax coolant lines are routed in a way that makes it difficult to upgrade turbochargers or other performance accessories. The HSP Diesel team has developed a solution for many of those issues. The all new billet thermostat housing and tube kit eliminates the factory coolant hose that crosses over the driver side valve cover. This allows more room for aftermarket turbo systems and fuel components. This component is for aftermarket chargers only.


  • HSP Billet upper thermostat housing
  • (1) Thermostat Housing O-ring (719-RFAB)
  • (3) M6x1.0x35mm Flange Bolts
  • (6) M6 Fender Washers
  • (3) M6 Nylon Lock Nuts
  • (4) M8x1.25-25mm Socket Cap Bolt
  • (4) M6x1.0-18mm Socket Cap Bolt
  • (1) 1.75”x3” Straight Boot (437-RFAB)
  • (1) 1.75”x90° Boot (433-RFAB)
  • (4) 1 3/4" Worm Gear Clamps (408-RFAB)


  • LB7: 01-04 VIN Code 1
  • LLY: 04.5-05 VIN Code 2


  • CNC machined billet aluminum thermostat upper housing
  • Allows for added room for aftermarket turbochargers
  • Easier access to fuel system components on drivers side valve cover
  • Powder coated hard tube to improve the look of the engine bay
  • Reinforced silicone boots and hard tube add strength over the factory rubber hose
  • Allows room for dual CP3 pump kits
Additional Information

Additional Information

Cab Size No
Brand HSP Diesel

Customer Reviews 1 item(s)

Very easy to install looks very good quality material
Got this to dress up my engine bay a little bit looks very good very good fitment very easy to install I got it in the black textured took a little under an hour to install
Review by Iron / (Posted on 12/17/2018)
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