Waterboxer Cylinder Head - 1900cc (not 1900cc DF) + 2100cc

This complete replacement cylinder head is designed for Volkswagen Type 25 (T3) Transporter Waterboxer engines with capacities from 1900cc to 2100cc, excluding DF engine codes unless replaced as a matched pair. Manufactured by AMC to OE specifications, this head is supplied fully assembled and ready to install, offering excellent reliability for standard road use and restorations.

What this part does

The cylinder head seals the top of the engine block and houses critical components including the valves, combustion chambers, and ports. It controls airflow into and out of the engine while sealing combustion pressure, coolant, and oil passages. A worn or cracked cylinder head can lead to compression loss, coolant leaks, overheating, and poor performance.

How it works

This AMC cylinder head features 40mm inlet valves and 34mm exhaust valves, allowing efficient airflow for improved combustion and smooth power delivery on larger-valve Waterboxer engines. Supplied complete with valves pre-installed, it ensures correct geometry, sealing, and durability when torqued to factory specifications.

Key specifications

• Engine type: Waterboxer (WBX)

• Capacity range: 1.9 – 2.1 litres

• Inlet valve size: 40mm

• Exhaust valve size: 34mm

• Manufacturer: AMC

• Specification: OE standard

• Supply: Complete cylinder head (assembled)

• Fuel compatibility: Not recommended for LPG use

Engine compatibility

Direct fit for the following Waterboxer engine codes:

• DG – 1.9

• DH – 1.9

• GW – 1.9

• SP – 1.9

• DJ – 2.1

• SR – 2.1

• MV – 2.1

• SS – 2.1

Important DF engine note:

• DF – 1.9 engines originally use smaller valves

• If fitting to a DF engine, cylinder heads must be replaced in pairs to maintain matched airflow and performance

Vehicle applications

• Volkswagen Type 25 / T3 Transporter: 1983–1992

• Petrol Waterboxer engines only

Fitting notes

• Always use new head studs, nuts, and sealing rings where specified

• Check pushrod tube seals and coolant junction seals during installation

• Cylinder heads should ideally be replaced as a matched pair

• Correct torque sequence and coolant bleeding are critical on WBX engines

This AMC complete Waterboxer cylinder head is a proven, OE-quality solution for keeping your T3 / T25 Transporter running reliably, making it ideal for maintenance, rebuilds, or long-term ownership.