Part number BLK90420 is a billet aluminum thermostat housing designed for Chevrolet small- and big-block V8 engines. It features a 45° angled outlet for 1½″ inside-diameter radiator hoses, ideal for applications needing clearance around radiators, accessories, or tight engine compartments. The housing swivels 360° at the base for flexible hose alignment. It seals with dual Buna-N O-rings and includes stainless steel mounting hardware. The black anodized finish provides corrosion resistance and a clean, modern appearance. It will not work with Tune Port Injection.

• Application: Chevy small- and big-block V8 engines
• Outlet orientation: 45° angled, accepts 1½″ hose
• Swivel range: 360° base rotation
• Material: 6061-T6 billet aluminum
• Finish: Black anodized
• Seal: Dual Buna-N O-rings (no gasket required)
• Hardware: Includes stainless steel fasteners