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0512phr Big 06 Z

With a bore size a shade under 4 inches, this Dart block has over 400-thousandths wall thickness on the minor thrust side (arrow) of the bore, and nearly 500-thousandths on the major thrust side.
Engine Build - The Outer Limits

With a bore size a shade under 4 inches, this Dart block has over 400-thousandths wall thickness on the minor thrust side (arrow) of the bore, and nearly 500-thousandths on the major thrust side.  View Related Article

 

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