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Where is the casting number on a 390 head? Ipopped the valve cover off one side today and found this number 8C29. I'm pretty sure the last number was a 9.
This isn't what I was expecting. The number was on the top middle of the head.
 

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The number you mentioned is the casting date.The casting number will be on the outside of the head between the two inner exhaust port openings..Livermore Dave.
 
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