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Big Chief / Big Duke 18° - Dome - 9.800" Deck


Diamond Pistons - Chevrolet Big Block Big Chief / Big Duke 18° - Dome / 9.800" Deck Height


  • Designed for use with Dart Big Chief & Brodix Big Duke 18° cylinder heads
  • Top gas ports for maximum ring seal
  • Ratios configured for .005” to .020” deck height @ 9.800” and 10.200”
  • Premium .185 wall H-13 Tool steel wrist pins included
  • Gasket volume = 11.3 cc”s
  • Top ring down from piston crown = .340” @ 1.240” cd to 1.270”cd. .290”-.300” @ 1.120cd
  • Part numbers 12750-12764 designed for 2.400” intake and 1.950” exhaust valve sizes
  • Part numbers 12765-12770 designed for 2.450” intake and 1.950” exhaust valve sizes
  • Part numbers 12765-12767 designed with a full round skirt design
  • Valve relief depth = .315” intake and .068” exhaust

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