CNC engineered gas flowed cylinder heads

Vauxhall Astra VXR



Click the image above for a larger picture


One of the hot hatch cars of the moment. A fantastic 240BHP in a cool looking body. The engine of course is based on the 16v 2,0 Vauxhall with a well sorted turbo bolted on. This engine is a kit car and sports car favourite as fitted to many caterhams and westfields etc.

This head has the potential boost that 240bhp by 80BHP to 320bhp and still be usable on the road with excellent mid range and top end power. Like many turbo engines we find they are restricted somewhat by the exhaust. This leads to poor response from the turbo. Exhasut flow was improved by 28% which makes a huge difference to turbo response and overall power through out the range (not just at the top end).

Call us for more details.

Cost for this head is £950.00 + vat on an exchange basis (Exchange £350) 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.


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.

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







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.