Our 
  range of heads for the MGC starts with the Standard Leadfree spec; it features 
  three angle valve seats, bronze guides and new springs. We recondition the original 
  valves as they are of a high quality and are usually in very good condition.
  The Econotune Head features modified valves, guides, throats and combustion 
  chambers.
  The Fast Road Head is fully modified and produces good power improvements especially 
  in conjunction with a Fast Road camshaft. The head produces even more power 
  with uprated carburetion and exhaust systems.
  Rally and Race heads receive further modifications to the ports and chambers 
  and run thinner valve seats; they are suited to rally/race camshafts, increased 
  carburetion and uprated exhaust systems. Triple Webers are ideal for Sprint, 
  Rally and Race applications. 
 
  
MGC 
  Heads 
MGC 
  Fast Road Head