This is a CNC ported cylinder head in a choice of 172 or 182 configuration to suit engines with standard valve sizes.
CAD designed, CNC machined combustion chambers with a volume and shape to match our PM240 CP Carrillo pistons giving 12.5:1 Compression ratio.
CAD designed, CNC machined inlet and exhaust ports
Valve seats cut using a Serdi machine with three angles and radiuses blending into the combustion chamber and valve throat
New valve guides on all heads honed to size (these are not cut down when porting to keep maximum valve stability)
Our CNC ported cylinder head is designed from scratch using 3D CAD modeling which allows us to keep the cross sectional area of the ports exactly as we would like - traditional CNC ported heads use a hand ported head that is scanned and could contain mistakes and discrepancies that can be copied over to the finished article.
The inlet ports are kept deliberately small to keep gas speed up and feature an anti-reversion exhaust port to minimise exhaust gas reversion into the combustion chamber.
Both inlet and exhaust flange faces are skimmed and the cylinder head is surface ground for a perfect seal on a multi layer steel gasket. The heads are cleaned in our ultrasonic tank and look almost as good as new. The cylinder head covers are vapour blasted to remove all dirt and corrosion to bring them back to looking almost new again.
The cylinder heads and covers are marked with their respective numbers and Pure Motorsport logos.
The head is a supplied as a bare casting with cover and cover dowels, exhaust studs, cambelt idler stud, cambelt upper cover studs and nothing else.
The heads are shipped out in a sturdy plastic container that must be returned to us with your exchange cylinder head in - for outright purchase please select above.
Suitable return heads must be in good condition, with matching cylinder head cover, small exhaust port, not modified in any way, have minimal or no scoring of cam journals and not having been skimmed. The head will be inspected when it arrives back here and if it isn't suitable for exchange you will be notified and the head will be returned to you. Please ensure you remove everything that you will need before returning the head to us and even better if you take the valves out!!
Please see our head return conditions here.