The Nismo High Compression Ratio Cylinder Head Spec 1 is specifically designed for all of the VQ35DE engines by NISMO. This cylinder head for the Fairlady Z and Skyline Coupe is made by the world famous NISMO, and is a great upgrade part for your vehicle.

Compared to a genuine VQ35 head, the combustion chambers of the genuine VQ30 are used as the base for casting a processing, providing the compact combustion chamber required by an NA engine. The volume has been greatly reduced. With the combustion chamber volume reduced from 56cc to 46cc, the compression ratio is increased without head milling (using a genuine piston, from 10.3 to 12.0). In addition, by changing the piston crown shape, a compression ratio of 13.5 is also possible.

While this head uses the dynamic valve system of the VQ30 engine, the intake port uses the high-potential port used in the VQ35. Spec-2 uses an intake valve seat diameter of 32 to modify the intake port inside R to realize performance thatgreatly exceeds that of a genuine VQ35 engine.

• Intake Valve Seat Internal Diameter 31mm
• Provides Compact Combustion Chamber
• Greatly Reduced Volume
• Reduced from 56cc to 46cc
• Increased Compression Ratio without Head Milling
• Utilizes Genuine Piston from 10.3 to 12.0
• Changes Piston Crown Shape
• Compression Ratio of 13.5 is Possible
• Increase Intake Port