CST2005, stage 3 cylinder head, small-bore +60 and over



Price - £785.00 + VAT

Surcharge for casting if not supplied - £125.00 + VAT. We now urge all UK based customers to try and source/supply their own castings as buying used core in reasonable quantities with the majority in usable condition is becoming very rare.

Super sport spec cylinder head -
Inlet valves: CST 31.75mm, 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: Applicable to camshaft sepc being used.
Top caps: Standard
Collets: Standard single groove
Chamber cap: Tailored to suit application.

This specification of cylinder head is for the small-bore based engines with +0.060”/1.50mm and over bore sizes. The larger bore sizes allow the use of a larger exhaust valve without the need to pocket the block to balance the use of larger inlet valve size. 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.

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.

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