ProMaxx 9207 Project X Aluminum Cylinder Head Features:

• Fully assembled with valve springs, steel valve spring retainers, Viton valve seals, 3/8 in. rocker arm studs, and guide plates
• Valve springs for use with a hydraulic roller camshaft with a maximum valve lift of .600 in.
• Cast from 356-T6 ultra-smooth aluminum with larger valve spring pockets and runners designed to be both accurate and precise.
• Uses a 14mm .750 in. reach spark plug such as NGK R5671A-7 (sold separately) or equivalent. 
• Valve Angle: 20°
• One-piece 21-4N stainless steel valves are back-cut and swirl polished to promote airflow and are installed in diamond-honed manganese bronze 11/32 in. guides.
• Combustion chambers with unshrouded, hardened steel valve seats that feature a competition 5-angle valve job.
• Fully assembled set of 2

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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