CNC engineered gas flowed cylinder heads

Ford Focus RS

 Inspired by the Ford Focus WRC contender and boasting impressive performance credentials of its own, the Ford Focus RS is part of the new generation of Fast Fords. The Ford Focus RS delivers an exhilarating combination of exciting power and acceleration, confident and precise handling, assured braking efficiency, aggressive exterior styling and a purposeful, driver-oriented interior. On the track scene its excellent chassis and engine are the basis for seriously competitive race cars.




Powerful, light weight and durable, the ZETEC-R engine is a real gem. Our gas flow engineering process measures flow as per a normally aspirated engine as turbo boost on a modified car cannot be easily simulated. (we are working on a new modeling process for turbo engines so call us if you require more details). However, our flow figures are nonetheless impressive.16.7% improvement in CFM flow on the inlet and 22.6% improvement on exhaust at 10″ pressure. A normally aspirated engine could produce as much as 247 BHP at 8200 rpm. Depending on your boost, mapping, exhaust and other factors such as air temprature and barometric pressure, a turbo charged car could easily exceed 500 BHP with this head.

In a road car it would certainly be a quick but because you engine runs more efficiently with this head, it would also be controllable and usable with superb low down power, less turbo lag, a lower power band and better fuel economy. Racing is what this head is all about and we have already built a race engine for a client with 470BHP verified on out own engine dyno using this head and without the need for extreme levels of boost.

Note : flow diagrams show flow against specific valve openings at 0.050 inch valve openings at 10″ pressure. Therefore actual flow volume increase is measured as the area under the graph (indicated in yellow for inlet and blue for exhaust). Standard valve sizes are used on our heads unless specified as a big valve version. Tests shown here are carried out on a flow bench on a bare head without filters. Therefore the difference between a standard engine with standard inlet ducting and filters will be larger than shown here.

Need a full race or fast road engine ? Contact us for details. We supply fully built race engines built in-house to the highest specification. We are happy to fit your new cylinder head or advise on fitting if required.

Cost for this head is £950.00 + vat on an exchange basis. (£350 exchange). A ‘taping’ service is also available for this head at an additional cost of £100 which will give the final hand finish to the ports and provide a further 1% flow. This price includes valves.


See below for the full reports as generated by our gas flow bench and Port Flow Analyzer software. Click on the images for full size image:




Cost for this head is £750.00 + vat on an exchange basis. (£350 exchange). A ‘taping’ service is also available for this head at an additional cost of £100 which will give the final hand finish to the ports and provide a further 1% flow.

Call us on +44 (0)161 483 4810 or email on SALES @ CNCHEADS.CO.UK . Check out our FREQUENTLY ASKED QUESTIONS PAGE for more information.

Custom made CamshaftsWith all of our gas flowed heads we also provide a custom made camshaft service. These camshafts are designed to optimise the flow characteristics of our heads. They can also be specifically designed to deliver the power characteristcs you require for your specific application.Your existing camshaft will work with our heads, however, if you want to get the most from one of these heads or you have a particular power characteristc you are looking for, we recommend that you consider our custom camshafts.Price £500 + vat


We are happy to discuss and advise on any aspect of modifying your engine with one of our heads to achieve the results we predict above. We can also supply the best quality gaskets, camshaft, valves, valve springs and head bolts to go with your new cylinder head. We also specialise in electronic engine management, carb and fuel injection , turbo and supercharger systems. We build race engines too. Built and tested on our own 1000bhp Engine Dyno. We can also fit your head to your engine if required and test your vehicle on our rolling road.

What ever your requirements, race, track day or fast road, we have a full range of the latest and best performance products and techniques. Our competition results year on year prove we have the expertise to make your car competitive at what ever class you chose to compete.