At Fiennes Engineering our engine reconditioning team has several decades of experience in the precision machining and repair of cylinder heads with expertise in all aspects of the process including welding and aqua-sealing, skimming, valve guide replacement, valve and valve seat re-facing, thread repair, re-shimming and unleaded conversions. We also offer a cylinder head skimming service – a process we highly recommend when the head gasket is replaced. This ensures a perfect surface for the head gasket to seal.