1. 

   David Hemker Well-Known Member

   I have put over 20000 miles on my heads with no hardened seats with no problems.

    

   David Hemker, Jan 19, 2005

   #21
2. 

   David Hemker Well-Known Member

   I have a set of 1970 service heads that I bought new in 1981 that have hardened seats.

    

   David Hemker, Jan 19, 2005

   #22

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