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Eagle Chevy Small Block 400 Competition Rotating Assemblies
InfoVehicle Info Needed
EAGLEPART NUMBER: 356-12503040

Eagle Chevy Small Block 400 Competition Rotating Assemblies

$2,49099
ShippingShips on 11/18/2026
Lowest PriceLowest Price Guarantee

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Chevy Small Block 400 Competition Rotating Assemblies
  • 3.750" Stroke
  • 6.000" Rods
  • Forged Pistons
      • Competition Rotating Assembly -
      400, 2.65 Main
      Stroke: 3.750
      Disp. @ .040: 409
      Rod Length: 6.000
      Pistons: -5cc Flat Top
      Rings: File Fit
      Comp. Ratio 64cc/76cc: 11.0/9.7

      Designed for Internal Balance - Flexplate/Flywheel and Balancer Not Included, Professional Machine Shop Balancing Required

    Eagle Chevy Small Block 400 Competition Rotating Assemblies are designed to offer the ultimate strength and reliability at affordable pricing for the most demanding applications using a Chevy 400 small block. Kits include high-quality components including an Eagle Forged 4340 Steel Crankshaft; Eagle H-Beam Rods; JE or Mahle Premium Forged Pistons; Hastings Rings; and high-performance Clevite or King Bearings.

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    Notes

    • Assembly part numbers that begin with “B” are balanced by Eagle and require no additional balancing.  Part numbers that do not begin with “B” are unbalanced assemblies and must be balanced by a qualified machine shop before use.
    • Kits are designed for internal balance.
    • Chevy 400 standard bore size is 4.125", kits are available in standard bore, .020", .030", .040" and .060" oversizes.
    • Eagle Specialty Products reserves the right to substitute pistons due to availability.
    Part TypeEngine Rotating Assembly Kit
    Product LineEagle SBC 400 Competition Rotating Assemblies
    BrandEAGLE
    Package Height20.0
    Package Width21.0
    Package Length31.0
    Weight70.0 PG
    Part CategoryPerformance Parts
    Crankshaft MaterialForged 4340 steel
    Piston And Ring Oversize0.04 in (1 mm)
    Main Bearing Undersize (Mm)Stock
    Wrist Pin StyleFloating
    Connecting Rod Beam StyleH-beam
    Rod Bearing Undersize (Mm)Stock
    Piston Ring Facing MaterialPlasmamoly
    Piston StyleFlat top, with two valve reliefs
    Assembly Lubricant IncludedNo
    Piston Head Volume (Cc)5
    Gaskets IncludedNo
    Rear Main Seal Style2-piece
    Main Bearing Undersize (In.)Stock
    Crankshaft IncludedYes
    Piston Rings IncludedYes
    Bore (Mm)105.791
    Actual Engine Cid409
    Engine Stroke3.75 in (95.25 mm)
    Connecting Rod MaterialForged 4340 steel
    Pistons IncludedYes
    Rod Bearing Undersize (In.)Stock
    QuantitySold as a kit
    Main Bearings IncludedYes
    Engine BalanceInternal
    Rod Bearings IncludedYes
    Connecting Rods IncludedYes
    Oil Pump IncludedNo
    Camshaft IncludedNo
    Timing Chain And Gears IncludedNo
    BalancedNo
    Piston MaterialForged aluminum
    Cam Bearings IncludedNo
    Part FitmentSemi Universal
    Plastigage IncludedNo
    Lifters IncludedNo
    Bore4.165 in (105.791 mm)
    Vendor Part Number12503040
    Package Qty1
    Package TypeEA
    Some parts are not legal for use in California or other states with similar laws / regulations
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