GTV-2 Cylinder Head - 85.5mm - Dual Spring (40mm Inlet Valves, 35.5mm Exhaust Valves)

High performance GTV-2 racing dual port cylinder head from EMPI, now upgraded with dual valve springs for higher RPM stability and increased performance potential. Designed for 1600cc and 1641cc aircooled VW Type 1 engines, these heads offer significantly improved airflow and durability over standard heads.

The cylinder head controls how air and fuel enter the engine and how exhaust gases exit. With intake and exhaust ports approximately 20% larger than stock, these heads allow greater airflow, improving combustion efficiency, horsepower and throttle response. The addition of dual valve springs ensures better valve control at higher engine speeds, reducing valve float and making them ideal for performance and racing applications.

Fitted with 40mm stainless steel inlet valves and 35.5mm stainless steel exhaust valves, these heads are built to handle increased power demands. Suitable for both standard 85.5mm (1600cc) and 87mm (1641cc) piston and barrel setups.

Features

• Twin port performance cylinder head
• Dual valve springs for high RPM use
• 20% larger intake and exhaust ports
• 40mm stainless steel inlet valves
• 35.5mm stainless steel exhaust valves
• Chromoly retainers and 3-groove collets
• 12mm spark plug thread

Specifications

• Bore size: 85.5mm (also suits 87mm 1641cc)
• Chamber volume: 56cc
• Intake port volume: 56cc
• Exhaust port volume: 66.5cc

Flow Data @ 25” Vacuum

• .100” – 55 CFM
• .200” – 87 CFM
• .300” – 113 CFM
• .400” – 130 CFM
• .500” – 137 CFM
• .600” – 141 CFM
• .650” – 142 CFM

Important Notes

• Sold individually (2 required per engine)
• Designed for twin port engines only
• Ideal for high performance, fast road and racing builds
• Dual springs recommended for use with performance camshafts

Recommended Additional Parts

• Performance camshaft and lifter set
• Heavy duty rocker assemblies and pushrods
• Twin port inlet manifolds
• Dual carburettor setups (Weber / Dellorto / EMPI HPMX)
• Cylinder head gasket set and upgraded head studs

To Fit

Aircooled VW (Type 1 Engines)

• VW Beetle – 1960–1979 – 1600cc / 1641cc twin port
• VW Splitscreen Van – 1960–1967 – 1600cc twin port conversions
• VW Baywindow – 1968–1979 – 1600cc twin port
• VW Karmann Ghia – 1960–1974 – 1600cc twin port
• VW Type 3 – 1961–1973 – 1600cc twin port (conversion use)
• VW Trekker (Thing) – 1968–1983 – 1600cc twin port
• VW Buggy & Baja – 1960–1979 – performance builds