GTV-2 Cylinder Head - 90.5mm - Single Spring (40mm Inlet Valves, 35.5mm Exhaust Valves)

High performance EMPI GTV-2 racing dual port cylinder head, engineered for 1776cc and 1835cc aircooled Type 1 engines using 90.5mm or 92mm piston and cylinder sets. Designed to significantly improve airflow and power, these heads are an excellent upgrade for performance builds, fast road engines, and weekend racers.

The intake and exhaust ports are approximately 20% larger than standard, allowing increased air and fuel flow into the engine and more efficient exhaust gas removal. This improved breathing results in better throttle response, increased horsepower, and stronger overall engine performance.

Each head is supplied fully assembled with 40mm stainless steel inlet valves and 35.5mm stainless steel exhaust valves, providing excellent durability under high temperatures. The heavy-duty single valve springs, combined with 3-groove collets and chromoly retainers, ensure stable valve control at higher RPM while maintaining reliability for road use.

With 55–56cc combustion chambers, these heads are well suited to performance engine builds where compression ratio and airflow are key factors. The precision-machined ports and performance valve job further enhance efficiency across the rev range.

Sold individually.

Specifications:
Twin Port Design
For 90.5mm / 92mm Bore (1776cc / 1835cc engines)
40mm Stainless Steel Inlet Valves
35.5mm Stainless Steel Exhaust Valves
Single Heavy Duty Valve Springs
3-Groove Collets
Chromoly Retainers
Combustion Chamber Volume: 55–56cc
Spark Plug Thread: M14 x 1.25 x 16

Flow (25” vacuum):
0.100” – 55 CFM
0.200” – 87 CFM
0.300” – 113 CFM
0.400” – 130 CFM
0.500” – 137 CFM
0.600” – 141 CFM

Fits:
VW Beetle 1776cc / 1835cc Twin Port Engines (based on 1300-1600cc cases)
VW T2 Baywindow Bus 1776cc / 1835cc Twin Port Engines
VW Karmann Ghia 1776cc / 1835cc Twin Port Engines
VW Type 3 1776cc / 1835cc Twin Port Engines
VW Trekker (Type 181) 1776cc / 1835cc Twin Port Engines
VW Buggy / Baja 1776cc / 1835cc Twin Port Engines

Note: Requires correct piston & cylinder kit (90.5mm or 92mm) and appropriate engine build specification.

Other parts you may need: performance camshaft, pushrods, rocker arms, cylinder head studs, gaskets, carburettor upgrade, exhaust system, and ignition upgrades to fully utilise the increased airflow.