Bull Boost Performance Thermostat Housing – 1.25” Silicone Fitting B/D Series Honda & Acura

Bull Boost Performance Thermostat Housing – 1.25” Silicone Fitting B/D Series Honda & Acura

Part Number: 720053571790

Product Description:

Upgrade your cooling system with the Bull Boost Performance Billet Thermostat Housing, designed for Honda and Acura B-Series and D-Series engines. This high-quality CNC-machined unit is a direct replacement for the factory housing, offering improved functionality, cleaner routing options, and a performance-focused design.

Featuring a threaded 1.25” radiator hose outlet, this housing eliminates the need to modify or weld factory components, making it ideal for custom builds and engine bay upgrades. Built for reliability and versatility, it also includes additional ports for sensors and accessories, giving you more flexibility for performance setups.

Key Features:

• Premium Bull Boost Performance billet thermostat housing
• Direct OEM replacement with factory-style mounting
• CNC-machined aluminum construction for durability
• Standard 1.25” radiator hose outlet (16OR thread)
• O-ring sealed outlet for leak-free performance
• Integrated fan switch port
• Additional 1/8” NPT port for gauges or accessories (plug included)
• Retains factory ground mounting provision
• Clean, high-performance engine bay appearance

Fitment:

• Honda / Acura B-Series engines (1988–2001)
• Honda / Acura D-Series engines (1988–2000)
• Excludes D16Z6

Installation Notes:

• Direct bolt-on installation using factory mounting points
• Located near intake manifold with simple 2-bolt mounting
• Dual top hole design allows compatibility across multiple applications
• Minor modifications may be required for certain transmission or clearance setups

Warranty Disclaimer:

All warranties, claims, and product-related issues must be handled directly through BULL BOOST PERFORMANCE.