Billet Specialties BLK90119 Thermostat Housing -20AN Straight Up Chevy Small Block Big Block Black Anodized

The Billet Specialties BLK90119 is a precision-engineered thermostat housing designed for Chevrolet small block and big block engines, featuring a -20 AN straight-up neck configuration with a black anodized finish. This premium housing is machined from 6061-T6 billet aluminum and includes an O-ring seal for reliable, leak-free performance.

Key Features:

• -20 AN male fitting with straight-up neck orientation for optimal coolant hose routing
• Precision CNC-machined from 6061-T6 billet aluminum with durable black anodized finish
• O-ring seal design eliminates leaky paper gaskets
• Includes mounting hardware and O-ring for complete installation
• Compatible with stock thermostats or can be used without a thermostat for racing applications
• Accepts all major name brand thermostats

This thermostat housing is engineered to help route coolant hoses in engines with limited space, allowing positioning of radiator hoses in almost any direction. The straight-up design is ideal for custom vehicles, street rods, and performance builds where precise coolant system routing is critical.