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CST2004, Stage 3 cylinder head, small-bore up to +40

£625.00
Quantity:
Price - £625.00 + VAT 
 
Surcharge for casting if not supplied - £75.00 + VAT 
 
Super sport spec cylinder head -  
Inlet valves: 30.93mm, triple groove collet EN214N plasma-nitrided 
Exhaust valves: 26.42mm, triple groove collet EN214N plasma-nitrided  
Guides: Manganese bronze 
Stem seals: A+ sprung on all 8, Viton material on inlets 
Valve springs: 180lb nominal dual coil, shimmed to correct fitted length 
Top caps: Standard 
Collets: Standard triple groove  
Chamber cap: Tailored to suit application. 
 
 
This specification of cylinder head is for the small-bore based engines with up to +0.040”/1.0mm bore sizes. The smaller bore sizes limit the size of the exhaust valve. Based on used core castings it is modified to CST current conventional road-sports style to maximise road-sports and track day/weekend-warrior performance when used with road-sports and super-sports camshaft specifications. That means optimised BHP and torque out-put through port shape and dimensions and valve throat shapes. Developed on an airflow bench and then on engine dyno/rolling roads to work with the aforementioned camshaft types along with suitable compression ratios given modern lead-free fuel specifications. High quality Serdi lead-free exhaust seat inserts are fitted.  
 
All cylinder heads are done to order as I have always more heads on order than I can ever hope to catch up with to produce stock for the shelf.