Identify this mystery head.

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Dart Frog

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Hey guys this one's got me baffled, someone tell me what this head is it's advertised as a X head but it says it was cast in the '80s? Looks like a 308 did they ever make those with the x cast on them. Article also States 2.02 intake valve.

Screenshot_20250309-094103.png
 
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I just don't see an X head lasting very long in an endurance type application with that much material milled out of the deck surface...
 
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