-20 AN LS Thermostat Housing for GM LS Engines
-20 AN LS Thermostat Housing for GM LS Engines
-20 AN LS Thermostat Housing for GM LS Engines
Close-up of a Corvette LS thermostat housing upgrade with red accents
Close-up of a billet LS thermostat housing for tube chassis build with a metallic finish
-20 AN LS Thermostat Housing for GM LS Engines
-20 AN LS Thermostat Housing for GM LS Engines
-20 AN LS Thermostat Housing for GM LS Engines
-20 AN LS Thermostat Housing for GM LS Engines
Close-up of a Corvette LS thermostat housing upgrade with red accents
Close-up of a billet LS thermostat housing for tube chassis build with a metallic finish
-20 AN LS Thermostat Housing for GM LS Engines

-20 AN LS Thermostat Housing for GM LS Engines

WA01001LS

$79.99
/
Shipping calculated at checkout.

Wide Open Design’s -20 LS Thermostat Housing makes plumbing your LS cooling system simple, clean, and reliable, especially in tight tube chassis or custom swap applications. This housing is designed around the OEM 1997–2008 Corvette LS thermostat and gasket, allowing you to retain factory function with upgraded plumbing capability.
Any fuel injected LS engine relies on coolant temperature data for proper ECU function. Removing the thermostat can negatively impact warm up cycles, drivability, and engine management. That’s why we designed this housing to work with an OEM-style thermostat- just like GM intended.

Included Items

  • (1) -20 LS Thermostat Housing
    Note: Thermostat and fittings sold separately

If you need a thermostat, this housing works perfectly with:

Specifications 
  • Fits: ALL Chevy GM LS-based engines
  • Thermostat Compatibility: OEM 97–08 Corvette Thermostat & Gasket
  • Hose Size: -20 AN
  • Material: Billet Aluminum
  • Manufacturing: Precision Machined in the USA

Cooling System Comparison Table

Factory Water Neck WOD -20 AN Housing
Bulky molded hose AN plumbing
Limited routing options Flexible hose routing
Difficult in tube chassis builds Ideal for custom chassis
Factory appearance Clean race-inspired appearance
OEM replacement only Supports custom cooling systems
Fitment 

Compatible with all GM LS-based engines including:

Engine Fits
LS1 ✓
LS2 ✓
LS3 ✓
LS6 ✓
LQ4 ✓
LQ9 ✓
LM7 ✓
5.3 LS ✓
6.0 LS ✓
6.2 LS ✓

Ideal for:

  • LS swaps
  • Tube chassis buggies
  • Rock crawlers
  • Ultra4 race cars
  • Rock bouncers
  • Custom Jeeps
  • Sand cars
  • Prerunners
  • Engine swap projects
Tech Insight 

Does this housing include a thermostat?

No. Thermostat sold separately.

Will this fit an LS3?

Yes. Fits all GM LS-based engines.

Why not remove the thermostat entirely?

Fuel-injected LS engines rely on coolant temperature data for proper warm-up and ECU operation. Removing the thermostat can negatively impact drivability and engine management.

What size hose does this use?

Designed for -20 AN cooling system plumbing.

Which thermostat should I run?

160° for performance-focused builds and 187° for most street and trail-driven vehicles.

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