The K-series engine in the MGF and MG TF uses two fundamentally different cylinder head castings, and the catalogue splits into two sections to reflect this. The Non-VVC head is a DOHC 16-valve crossflow aluminium casting with fixed-timing camshafts, fitted to the MGF 1.8i, MGF 1.6i, TF 115, TF 120 Stepspeed, and TF 135. The VVC head shares the same basic layout but incorporates additional machined surfaces, bearing supports, and oil galleries to accommodate the Variable Valve Control mechanism on the inlet camshaft, and is fitted to the MGF VVC, MGF Trophy 160, and MG TF 160. The engine number prefix is the definitive identifier: 18K4F and 16K4F point to the Non-VVC section; 18K4K points to the VVC section.
Non-VVC and VVC heads are not interchangeable, the VVC head needs the VVC timing drive and ECU calibration, and the Non-VVC head cannot accept the VVC mechanism.
The Head Gasket, The Defining Service Item
The cylinder head gasket is the single most widely discussed service topic on any K-series MGF or TF. The original elastomer (Klinger) head gasket used across the K-series range was prone to failure, and the mid-engine installation in the MGF and TF makes that vulnerability more consequential than in a front-engined application, the long coolant runs between the rear-mounted engine and the front-mounted radiator make airlocks harder to purge and localised overheating more damaging. The MGOC Spares head gasket and lower rail kits (HGF1 for Non-VVC, HGF2 for VVC) are the definitive service solution, originally developed by Land Rover for the K-series in the Freelander application. Each kit includes a multi-layer steel (MLS) head gasket, a strengthened lower rail assembly, a set of ten 10.9-grade head bolts, and a cam locking tool, everything required for a complete, properly-specified head gasket replacement.
The MLS seal is a metal-to-metal joint that does not degrade in the way the original elastomer gasket could, the uprated bolts deliver consistent and higher clamping force, and the strengthened rail stabilises the bottom end against the liner movement that contributed to the original failure mode.
Cylinder Liner Protrusion, Checked Before Every Head Gasket Fit
Before fitting any new head gasket, MLS or otherwise, cylinder liner protrusion must be measured. All four liners must protrude at least 0.1mm above the block deck face, and the protrusion must be consistent within specification across all four cylinders. Liners that have sunk below specification require shimming using dedicated liner shim kits to restore correct protrusion height. Fitting a head gasket to liners outside specification is one of the most common causes of repeat head gasket failure and is addressed by simple measurement and, where necessary, shimming.
Head Components by Category
Within each of the Non-VVC and VVC sections, the catalogue covers the cylinder head casting itself (as a bare item or complete with valves), inlet and exhaust camshafts (with significant production-change variation by engine number, particularly on Non-VVC where three inlet and three exhaust camshaft specifications were used across production), cam followers, valve stem seals, valves and springs, the cam carrier cover (rocker cover) and its gasket, camshaft oil seals (with colour-coded front and rear variants on later engines), and all head bolts, studs, and fixings. The VVC section additionally contains the VVC hydraulic control unit, VVC valve assembly, VVC valve solenoids, and VVC-specific oil seals that are unique to that mechanism.
Which Branch to Use
For every head-related order, confirm the engine number first. Non-VVC engines (18K4F or 16K4F prefix) use the Cylinder Head - Non VVC section of this catalogue. VVC engines (18K4K prefix) use the Cylinder Head - VVC section. Within each, further identification by engine number and VIN breakpoints is often required for camshafts, camshaft covers, and oil seals, as the specification changed across production.
The engine number is stamped on the block below the exhaust manifold and should be to hand when ordering any head component.