Bull Boost Performance K Series Upper Coolant Housing with Integrated Filler Neck – K20 / K24A1 Honda Acura (16AN)

Bull Boost Performance K Series Upper Coolant Housing with Integrated Filler Neck – K20 / K24A1 Honda Acura (16AN)

Part Number: 716715750467

Product Description:

The Bull Boost Performance K Series Upper Coolant Housing with Built-In Filler Neck is designed to improve cooling system efficiency and simplify coolant bleeding on Honda and Acura K-Series engines. Engineered with performance builds in mind, this upgraded housing relocates the radiator fill point to a higher position on the engine, helping eliminate trapped air pockets and improving overall cooling system reliability.

This design is especially beneficial for turbocharged and high-performance applications where engine bay layout and heat management are critical. By integrating the filler neck directly into the upper coolant housing, this unit frees up valuable space around the engine while improving accessibility and coolant system functionality.

Key Features:

• Genuine Bull Boost Performance Upper Coolant Housing with Integrated Filler Neck
• Designed for Honda K-Series engines (K20 / K24A1 applications)
• Built-in coolant filler neck for improved system bleeding
• Relocates radiator fill point to highest cooling system location
• Helps eliminate air pockets in coolant system
• Improves cooling system efficiency and reliability
• Frees up engine bay space for turbo and performance setups
• Available with AN-style fitting compatibility (16AN version shown)
• Precision-machined construction for leak-free operation

Performance Benefits:

• Easier and faster coolant bleeding
• Reduced risk of overheating from trapped air pockets
• Improved cooling system stability under boost
• Cleaner engine bay layout for modified setups
• Better thermal management for high-performance builds

Fitment:

Compatible with Honda and Acura K-Series cylinder heads:

• K20A
• K20A2
• K20A3
• K20Z1
• K24A1

Important Notes:

• Does NOT fit PRB intake manifolds
• May not fit throttle bodies with cruise control setups
• Designed for performance and swapped applications
• Professional installation recommended for best results
• Use appropriate radiator cap compatible with OEM-style Honda Civic (92–00) systems or equivalent setup

Warranty Disclaimer:

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