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KB Performance Pistons IC9925.040-1

Ford 351ci Windsor FHR Forged Piston Flat Top 4V

KB Performance Pistons IC9925.040-1

648-IC9925.040-1

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Estimated ship date 06/30/17 if Ordered Today
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KB Performance Pistons IC9925.040-1 Ford 351ci Windsor FHR Forged Piston Flat Top 4V $72.99
Ford 351ci Windsor FHR Forged Piston
  • Flat Top 4V
  • 4.040'' Bore (+.040'')
  • Use w/5.956'' Connecting Rod & 3.500'' Crank Stroke
  • Comp. Ratio: 11.0/58cc; 10.5/64cc; 9.8/76cc
  • 1/pkg

  • KB Performance Pistons IC9925.040-1 Details

    Ford 351ci Windsor

  • Flat Top Pistons
  • This piston is based and intended for use on the Windsor-based Small Block Ford. Use with Ford 351W block. Pre-71 blocks have a .020'' shorter deck.

    Technical Specs:
  • Alloy: Premium 4032 Alloy
  • Bore: 4.040''
  • Crankshaft Stroke: 3.500''
  • Connecting Rod Length: 5.956''
  • Deck Height: 9.500''
  • Compression Height: 1.774''
  • Pin Size: 0.912'' x 2.750''
  • Pin Location: Offset (spacer ring included)
  • Flat Top: -11cc 4 Symmetrical Valve Reliefs
  • Intake Valve Relief: N/A
  • Exhaust Valve Relief: N/A
  • Top Landing Height: 0.247''
  • Ring Grooves: 5/64'' Top; 5/64'' Middle; 3/16'' Bottom
  • Gram Weight: 544/131
  • Compression Ratio: 11.0:1 w/58cc Heads; 10.5:1 w/64cc Heads; 9.8:1 w/76cc

  • Specifications:

    Manufacturer's Part Number:
    IC9925.040-1

    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.

    Features

    • 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

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