"These heads are strictly designed for race use. We use a special valve and valve spring combination to ensure long life, maximum flow and maximum rev potential. Special attention is engineered into the valve throat, valve seat and chamber area to cause minimum disruption to gas flow. Price includes £60 surcharge for exchange unit. Upon receipt of your serviceable exchange cylinder head, the surcharge will be refunded by our Mail Order department.

These cylinder head come with Colisbro minispeed valve guides and new design valve stem seals, also roller spring platforms are fitted and Eibach race spings. this is the best 36x31 race 5 port cylinder head you can buy. "