Valve seats

[Mike Blakey]

I have a cast iron head, Ford V6 Essex, which does not have valve seat inserts.  It 
has to date been very reliable, running on a Carb and ECU ignition (home made).
Here in the UK we have just (1st Jan 2000) had leaded fuel banned, so I am 
concerned as to the potential problems. I've heard so much conflicting advice about 
un-leaded fuel and valve seat inserts. Does anyone have any real experience of 
running without lead on a tuned motor?
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