B58 Closed Deck Cylinder Head Mod

5150 AutoSport B58 Closed Deck Cylinder Head Modification Service

High horsepower B58 engines are known to experience cylinder head sealing issues due to the coolant jacket design around the combustion chamber. Under extreme cylinder pressure, the factory head flexes and pushes compression into the cooling system, leading to:

• Cooling system over pressurization
• Coolant loss
• Head lift
• Head gasket failure
• Unsafe coolant discharge under racing conditions

At 5150 AutoSport, we developed our proprietary B58 Closed Deck Cylinder Head Modification to reinforce the weak areas surrounding the combustion chamber and improve sealing stability in extreme horsepower applications.

This process is designed for serious high-boost and high-cylinder-pressure builds targeting 1000+ HP applications.

Our process includes:

• Extensive CNC machining
• Custom reinforcement inserts
• Precision welding
• Multi-stage resurfacing
• Pressure testing
• Proprietary reinforcement procedures

Unlike simple insert jobs, our process is engineered to withstand real world heat cycles and extreme cylinder pressure without insert movement or collapse.

This modification has been tested and proven on high-horsepower B58 applications under demanding racing conditions.

Built for racers who want reliability, safety, and confidence at extreme power levels.