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United Engine Machine IC991.125-1

Chevy 454ci FHR Forged Piston Flat Top

United Engine Machine IC991.125-1
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ON SALE - $33.20 OFF
United Engine Machine IC991.125-1 Chevy 454ci FHR Forged Piston Flat Top $72.99
Chevy 481ci Forged Piston
  • Hollow Dome Top .425''
  • 4.375'' Bore (+.125'')
  • Use w/6.385'' Connecting Rod & 4.000'' Crank Stroke
  • 11.4:1/119cc Compression Ratio
  • 1/pkg.

  • United Engine Machine IC991.125-1 Details

    Chevy 454ci

  • Open Chamber Dome Top Pistons
  • Use w/6.385'' Connecting Rods
  • Designed to fit AFR, RHS, World, Edelbrock, Brodix, Dart and O.E. Chevrolet open chamber heads that are 118cc or larger. ALWAYS CHECK PISTON TO CHAMBER & VALVES TO ASSURE ADEQUATE OPERATING CLEARANCE.

    Technical Specs:
  • Alloy: Premium High Ductility 2618
  • Bore: 4.375''
  • Crankshaft Stroke: 4.000''
  • Connecting Rod Length: 6.385''
  • Deck Height: 9.800''
  • Compression Height: 1.395''
  • Pin Size: 0.990'' x 2.750''
  • Pin Location: Centered
  • Hollow 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: 0.360''
  • Ring Grooves: 1/16'' Top; 1/16'' Middle; 3/16'' Bottom
  • Lock Ring: PRG110-3 Spiral Lock Rings
  • Gram Weight: 620 (piston) / 141 (pin)
  • Compression Ratio: 11.4:1 w/119cc Combustion Chamber

  • 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

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