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Lunati BP421IN

Pro Series Crankshaft Big Block Chevy

Lunati BP421IN
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638-BP421IN

made in usa
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Ships 12/13/16 if Ordered Today
Lunati BP421IN Pro Series Crankshaft Big Block Chevy $1,867.99
Pro Series Crankshaft
  • Big Block Chevy
  • Stroke: 4.250"
  • Main Bearing: 2.750"
  • Rod Journals: 2.200"
  • Minimum Rod Length: 6.385"
  • Rear Main Seal: 2-piece

  • Specifications:

    Engine Balance
    Internal
    Rear Main Seal Style
    2-Piece
    Balancer Bolt Thread Size (in.)
    1/2-20
    Crankshaft Material
    Forged 4340 steel
    Crankshaft Snout Style
    Standard
    Engine Stroke (in.)
    4.25
    Lightened
    Yes
    Main Bearings Included
    No
    Main Journal Diameter (in.)
    2.749
    Quantity
    Sold individually
    Requires Narrow Bearings
    Yes
    Rod Bearings Included
    No
    Rod Journal Diameter (in.)
    2.2
    Manufacturer's Part Number:
    BP421IN

    Lunati Pro Series forged crankshafts are top of the line units, manufactured from the highest quality 4340 certified steel. Their 4340 steel forgings meet aircraft quality standards for material cleanliness and purity. Every crank is American forged, American machined and quality checked to meet our exact specifications including: a shaft surface finish of grade 5 RMS or better, journal radii are ground to .140 inch, roundness of each journal is .0001 inch or less and each rod journal is drilled with a 7/8 inch or 3/4 inch lightening hole to reduce the inertia weight of the crankshaft. The Pro Series by Lunati is engineered with high performance street and all-out race engines in mind. Pro Series Crankshafts have been successfully used in 1,500+ hp applications.

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