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United Engine Machine ICON FHR PISTON BBC SET

United Engine Machine IC9981.010


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United Engine Machine ICON FHR PISTON BBC SET $546.99
Chevy 434ci Stroker FHR Forged Pistons
  • Solid Dome .204''
  • 4.135'' Bore (+.040'' 396; +.010 402)
  • Use w/6.135'' Connecting Rod & 4.000'' Crank Stroke
  • 10.9:1/96.5cc; 10.0:1/105cc; 8.9:1/119cc Compression Ratio
  • 8/pkg.

  • United Engine Machine IC9981.010 Details

    Chevy 396/402ci

  • Dome Top Pistons
  • Notes: Designed to use a 396 block with a 454 crankshaft. Centered pin. No mini grooves on top land. For a 396ci engine (4.095" std bore), this piston will be a .040" over bore. Compression ratio will be 10.9 on 96.5 head (Closed chamber head).

    Technical Specs:
  • Alloy: Premium 4032 Alloy
  • Bore: 4.135''
  • Crankshaft Stroke: 4.000''
  • Connecting Rod Length: 6.135''
  • Deck Height: 9.800''
  • Compression Height: 1.645''
  • Pin Size: 0.990'' x 2.750''
  • Pin Location: Centered
  • Solid Dome Top: .204''; 17cc; 1 Valve Relief (Closed Chamber Design)
  • Intake Valve Relief: N/A
  • Exhaust Valve Relief: N/A
  • Top Landing Height: 0.310'' (No mini grooves on top land)
  • Ring Grooves: 1/16'' Top; 1/16'' Middle; 3/16'' Bottom
  • Lock Ring: LR984A Round Wire
  • Gram Weight: 605/141
  • Compression Ratio: 10.9:1 w/96.5cc Heads; 10.0:1 w/105cc Heads; 8.9:1 w/119cc Heads

  • Formed Head Relief Design Pistons

    The Icon FHR (Formed Head Relief) series are an ''Off The Shelf'' piston loaded with premium features that are usually found in specialty custom made pistons. FHR pistons have valve reliefs that are formed in as the piston blank is pressed into the die. Many of the domed models are solid which allows tailoring the dome height for a specific compression ratio. Forged from 4032 Alloy material containing 11% silicon content which controls the thermal expansion so a tighter piston to wall clearance may be used over the 2618 alloy. The additional silicon wil also increase wearability on the skirts and pin bores making this an ideal material for street and some boosted applications.


    • Premium 4032 Alloy
    • Die Formed Valve Reliefs
    • Top Land Mini Groove Technology Reduces Friction
    • Diamond Finished Piston Skirts
    • Second Land Accumulator Grooves Increase Stability in the Bore
    • Tru-Arc Lock Rings
    • 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

    Some parts are not legal for use in California or other states with similar laws / regulations