Section : Engine

Unleaded head

Posted By : Steve Cureton, 06-Jun-2004, 09:38pm

• Unleaded head

  Posted By : Ben Ferguson, 07-Jun-2004, 00:56am

  Hi Steve,
  From the outside of the head there is nothing that can say for definate if it has been converted to unleaded. I bought my car ready converted and you can tell it has been done fairly recently because it has had new core plugs and a new coat of engine enamel.
  To check whether it has been done, I think the only definate way is to take the head off and remove a valve (cant remember whether they're installed on inlet or exhaust valves only), then look for the hardened seat.
  
  Cheers,
  Ben

  • Unleaded head

    Posted By : Steve Cureton, 07-Jun-2004, 11:10pm

    The core plugs have been replaced and the engine has been rebuilt by a previous owner (although he appears to have messed up somehow as the crank needs a regrind) so there's a good possibilty it's already had an unleaded conversion.
    
    The head is already off so it's no problem removing a valve but how can I tell if it's a hardened seat?