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United Engine Machine IC686.030

Ford Boss 302ci Forged Pistons

United Engine Machine IC686.030


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Estimated ship date 03/26/18 if Ordered Today
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United Engine Machine IC686.030 Ford Boss 302ci Forged Pistons $576.99
  • Solid Dome Top 6cc
  • 4.030'' Bore (+.030'')
  • Use w/5.155'' Connecting Rod & 3.000'' Crank Stroke
  • Comp. Ratio: 12.5/52cc; 11.0/60cc; 10.5/64cc
  • 8/pkg

  • United Engine Machine IC686.030 Details

    Ford Boss 302ci

  • Dome Top Pistons
  • Designed for factory or clone Boss 302. This piston is based and intended for use on the Windsor-based Small Block Ford with Cleveland style heads.

    Technical Specs:
  • Alloy: Premium Forged 4032
  • Bore: 4.030''
  • Crankshaft Stroke: 3.000''
  • Connecting Rod Length: 5.155''
  • Deck Height: 8.206''
  • Compression Height: 1.540''
  • Pin Size: 0.912'' x 2.750''
  • Pin Location: Centered
  • Lock Rings: PRL99-3 Spiral Locks
  • Dome Top: 6cc 1 Valve Relief
  • Intake Valve Relief: .186'' Depth / 2.360'' Diameter
  • Exhaust Valve Relief: N/A
  • Top Landing Height: 0.301''
  • Ring Grooves: 1/16'' Top; 1/16'' Middle; 3/16'' Bottom
  • Gram Weight: 519/131
  • Compression Ratio: 12.5:1 w/52cc Heads; 11.0:1 w/60cc Heads; 10.5:1 w/64cc

  • Ford Small Block Windsor Based Pistons

    United Engine and Machine Company is proud to introduce 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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