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United Engine Machine IC993.125

Chevy 489ci Forged Pistons Hollow Dome Top .425"

United Engine Machine IC993.125


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United Engine Machine IC993.125 Chevy 489ci Forged Pistons Hollow Dome Top .425" $626.99
Chevy 489ci Forged Pistons
  • Hollow Dome Top .425''
  • 4.375'' Bore (+.125'')
  • Use w/6.385'' Connecting Rod & 4.250'' Crank Stroke
  • Comp. Ratio: 12.0/119cc
  • 8/pkg

  • United Engine Machine IC993.125 Details

    Chevy 489ci

  • Dome Top Pistons
  • Use w/6.385'' Connecting Rods
  • Use with Chevy 454ci Block
  • Technical Specs:
  • Alloy: Premium High Ductility 2618
  • Bore: 4.375''
  • Crankshaft Stroke: 4.250''
  • Connecting Rod Length: 6.385''
  • Deck Height: 9.800''
  • Compression Height: 1.270''
  • Pin Size: 0.990'' x 2.750''
  • Pin Location: Centered
  • Solid Dome Top: .425'' -38cc 1 Valve Relief (Open Chamber Head)
  • Intake Valve Relief: 0.275'' Depth / 2.420'' Diameter
  • Exhaust Valve Relief: N/A
  • Top Landing Height: 0.340''
  • Ring Grooves: 1/16'' Top; 1/16'' Middle; 3/16'' Bottom
  • Gram Weight: 595/141
  • Compression Ratio: 12.0:1 w/119cc Heads
  • Will Fit AFR, RHS, Trick Flow, World, Edelbrock, Brodix, Dart & O.E. Chevy Open Chamber Heads That Are 118cc's Or Larger. Always Check Piston To Chamber & Valves To Assure You Have Adequate Operating Clearance.

  • Specifications:

    Manufacturer's Part Number:

    United Engine and Machine Company is proud to offer the Icon line of forged pistons. Icon brings the same quality and performance you've come to expect from other United Engine brands while adding a new lightweight forged design. No matter your high performance application, there is an Icon piston for you.


    • High ductility 2618 alloy
    • Perfect for Nitrous, Turbocharged and Supercharged Apps
    • Dual forced pin oiling on most applications
    • Lateral gas porting on higher compression ratios
    • Fully machined with deep valve pockets
    • Second land accumulator grooves
    • Top land mini groove technology
    • Diamond finished skirts
    • Triple wound spiral locks
    • Spacer rings included in short compression heights that intersect the wrist pin bore
    • Sold in Sets (except when noted as 1 piston per package)

      Click here for reference guide to piston top designs