Aluminium Cylinder Heads 4 Cyl

Having had 12 months development prior to their launch 5 years ago, these brand new cylinder heads are from our own drawings, patterns and castings, and are completely computer machined to our specifications. The development process has seen them, crack tested and inspected at every stage. We have run them on our dynamometer to remove all faults. Finally, we have sawn them in half to get right inside the casting, ports, oil and water galleries. During production every head is pressure tested and fitted with precision ground, replaceable, lead-free valve seats of the latest material, where applicable they are complemented by our top quality valves, guides, springs and top caps, these are complete and ready to fit with new rocker and manifold studs.

VALVES

All our valves are made from one-piece forgings in 214N stainless steel with stellite tips and plasma nitrided stems for increased life. Suitable for both leaded and unleaded fuel. These are made to the lightest design using standard size stems and collets.

COLISBRO-BRONZE VALVE GUIDES

These are essential in all engines with gas flowed ports whether aluminium or iron and engines converted to lead-free fuel. They are specially manufactured for us to the same standards as used by Formula 1.

Prices stated are per item.

COMPETITION VALVE SPRING SET

These give increased seat and nose pressure. Please note: To fit these springs in the 100 it is necessary to use (CENG 731 or ENG731) 3000 Top Caps.

ENG525HD - Double springs to suit std & 100M cams
CENG525 - Single springs to suit higher performance cams

LIGHTWEIGHT VALVE TOP CAPS

These are manufactured from either top quality aircraft aluminium and are hard anodised red or high grade steel and heat-treated, both are to suit 3000 size springs.

Prices stated are per item.

VALVE STEM OIL SEALS

These are top-hat type seals which fit around the top of the valve guide. They only fit with our competition single-valve springs.

Price stated is per item.

VALVE SPRING SHIMS

We have had these made specifically so that the race engines and badly worn road engines can have all the valve springs shimmed to the correct length. We have two sizes of bore diameter available to suit valve guides with or without circlips.

VALVE COLLETS

Due to the non-availability of good quality collets we have had these made to the highest tolerances from EN24T steel and heat-treated. Also direct replacement for the standard.
Price stated is per pair.

CYLINDER HEAD STUD SET

These are manufactured from the highest grade steel and heat-treated in order to have a greater resistance to stretching and therefore, with the special nuts that are supplied, helps reduce head gasket problems.

HEAVY DUTY CYLINDER HEAD WASHERS

A must when using an aluminium head, although also recommended for iron heads as well.
Price stated is per washer.
11 required for 4 cylinder
16 required for 6 cylinder