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How to Check to See if your Head is Leaded or Unleaded

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Check for exhaust valve seat inserts. here's an insert, prior to final cut. the lip being talked about is about 1/4 down from the surface. If it's smooth all the way around, from surface down into the port, then it's not inserted/unleaded. If you feel a hard, 90 degree lip and opens up a bit more after that, then it's got inserts.
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