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CST2008 Big valve reconditioned 12G295

£410.00
Quantity:
Price - £410.00 + VAT 
 
Surcharge for casting if not supplied - £95.00 + VAT 
 
Spec -  
Inlet valves: Genuine REC 33.27mm, single groove collet EN214N plasma-nitrided 
Exhaust valves: CST 27.18mm, single 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 single groove  
Chamber cap: Tailored to suit application. 
 
Based on used core 12G295 original Cooper spec castings, this is a fully reconditioned unit but fitted with larger valves. The larger REC inlet valve is used to achieve a well-performing valve seat/throat area. The 295 is notorious for having very narrow inlet valve seats as standard leaving no material to work with to improve flow. This inlet valve allows a good, multi-angle seat profile to dramatically improve flow. A larger exhaust valve is fitted to help balance the flow. The ports in the 12G295 head are already verging on being too big, so do not require modification for the vast majority of applications.  
 
Fitted with exhaust seat inserts for unleaded fuel compatibility. 
 
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.