This is the valve and spring kit that comes standard with the PPE Cast Iron Cylinder Heads. Kit features straight valve springs with an installed pressure of 85-90 pounds, which offers higher responsiveness and better boost handling. All valves are fully nitridated, 21-4N super alloy exhaust valves.

The spring retainers and seats are made of case-hardened high-strength chromoly steel for superior wear resistance. The FKM valve seals are tailored to the Cast Iron Heads’ valve guides for a tight seal.

Each kit services two complete cylinder heads.

Kit includes:

• 16 intake valves
• 16 exhaust valves
• 32 springs
• 32 spring retainers
• 32 spring seats
• 32 sets of valve keepers
• 32 valve seals