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ALUMINIUM CYLINDER HEADS - 4 CYLINDER

Since 1995 we have been successfully producing our aluminium 100/4 cylinder heads.  In 2003 we took the decision to upgrade our product. We went  back to the drawing board and started with completely new CAD drawings to ensure accuracy and perfect detail in our product. We then further enhanced this ‘design to manufacture’ investment philosophy by including state of the art CAM software. When it comes to machining, we have seen a huge upgrade to our capabilities with the acquisition of a brand new 5 axis CNC machining centre in 2010.

For more information on our new cylinder heads and how we can improve your cars performance please see below or contact our Sales personnel.

TYPES OF CYLINDER HEADS

• BARE HEAD
  Fully machined bare head (as cast ports) with valve inserts fitted and semi-formed seats. Ready for you to supply and fit valve guides, cut seats, final skim head gasket face and assemble with your components. (Must use 6 cylinder exhaust valves).

• STANDARD COMPLETE
  Supplied ready assembled by us in our own factory. Bronze valve guides, stainless steel valves, steel valve top caps and heavy duty springs etc. All as listed on page 14. Head gasket face final skimmed giving a combustion chamber of 62cc as original.

• FAST ROAD COMPLETE
  As ‘Standard’ with the addition of CNC machined ports, all symmetrical and matching. Aluminium valve top caps, competition valve springs and top hat stem seals. 62cc chamber volume.

• FULL RACE COMPLETE
  As ‘Fast Road’ with larger CNC machined ports, for increased flow. The significantly larger exhaust ports are best suited to a large bore manifold gasket and big bore exhaust. They also benefit from dowel holes machined in the manifold face to match the inlet manifolds precisely to the ports. 62cc chamber volume. Both inlet and exhausts ports are hand fettled after CNC machining to achieving the desired surface finish and gas flow characteristics.

PLEASE NOTE: If intending to use any of the above with our roller rockers (CENG502K) please specify with order to have push rod holes machined to suit. 

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.
Precision turned with honed bores these should not require reaming after fitment. Colisbro material being of a copper colour should not be confused with the inferior yellow brass coloured cheaper alternatives.

Now available - Tapered Bronze Value Guide.

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.

COMPETITION VALVE SPRING SET

Our Competition Valve Spring Set provides increased seat and nose pressure.

PLEASE NOTE: To fit these springs in the 100 it is necessary to use (CENG731 or ENG731) 3000 Top Caps.

ENG525HD - Double springs to suit standard & 100M cams.
CENG525 - Single springs to suit higher performance cams i.e our DWR 2.

LIGHTWEIGHT VALVE TOP CAPS

Our Valve Top Caps 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.

VALVE COLLETS

We have had these made to the highest tolerances from EN24T steel and heat-treated. These are also a direct replacement for the standard.

VALVE SPRING SHIMS

Our Valve Spring Shims have been specifically made 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 STEM OIL SEALS

These are top hat type oil seals which fit around the top of the valve guide. We offer Black which feature a rubber case and are suitable for single valve springs or Green which have a metal case and are suitable for single or double valve springs..

ROCKER OIL FEED PIPE

Our Rocker Oil Feed Pipe is a faithful reproduction of the original.

Made in our own factory.

CYLINDER HEAD STUD SET

Our Cylinder Head Stud Set is manufactured from the highest grade steel and heat-treated in order to have a greater resistance to stretching and with the special nuts that are supplied helps reduce head gasket problems.