E-Torque’s Unique Cylinder Heads

Jaguar XK 4.8 Liter Upgrade Kit

This 4.8 litre Twin Spark cylinder head has been developed for an aluminum block XK engine which is currently under development at E-Torque.  This engine has 94mm bores with a 115mm stroke, which puts its displacement at 4.8 Litres.

However, this cylinder head can also be used on a stroked 4.2 L block.  It will make 400 hp on a 4.7 L engine.

To make that kind of horsepower, E-Torque developed special High Performance cams with .500” lift and lot’s of duration. These camshafts will produce a loppy idle and may be challenging for a novice driver, as the low speed drivablity will require a different style of driving.

This 4.8Ls engine rebuild kit will require that you purchase a 4.7 L Stroker Kit. This is perfect because it is always good to replace the original crankshaft with a billet steel version. First - a new crankshaft will get rid of the rope rear bearing seal that causes chronic oil leaks, and second, old crankshafts do break when you dramatically increase the power of the engine.

What is included in the 4.8 Litre Upgrade Kit:

• A fully assembled 4.8 Liter E-Torque Cylinder Head machined for Twin Spark operation - with shimmed buckets and ready to install

• A set of forged custom CP‐Carrillo® 11:1 compression pistons

• A stand alone Electronic Twin Spark Ignition System

• Two Wire Looms and associated hardware to organize the spark plug wires along the cylinder head

• Head Replacement Gasket Set including Cometic® Head, Cam Cover, Inlet & Exhaust gaskets