Exhaust valve guide stepped for 8 port head-single guide

This is for one exhaust colsibro valve guide only, stepped which retains the valve spring collar on 8 port alloy heads manufactured from July 2010. The exhaust guide has not got a taper on port end whereas inlet has for better flow.Contact our York branch for spares. These valve guides can be fitted to earlier 8 port heads but will require specialist machining