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6 cyl aluminum head - cracked valveseat

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BoyRacer

BoyRacer

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I just discovered that the cylinder head on my race motor has a cracked valve seat. It is the 6 cylinder aluminum head with the figure "8" style of valve seats. The casting number on the head is AEC 721. Has anyone successfully replaced or repaired one of these seats? Anyone out there had any experience with this issue? Anyone with with a spare bare aluminum head?
 
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