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Lunati BQ421KN

Pro Series Crankshaft Big Block Chevy

Lunati BQ421KN

638-BQ421KN

made in usa
jegs shipping
FREE Shipping
Estimated ship date 09/28/17 if Ordered Today
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Lunati BQ421KN Pro Series Crankshaft Big Block Chevy $1,916.99
Pro Series Crankshaft
  • Big Block Chevy
  • Stroke: 4.500 in.
  • Main Bearing: 2.750 in.
  • Rod Journals: 2.200 in.
  • Minimum Rod Length: 6.535 in.
  • Rear Main Seal: 2-piece

  • Lunati BQ421KN Details

    Pro Series Crankshaft

    Pro Series; Crankshaft; Stroke 4.5 in.; Main Dia. 2.750 in.; Pin Dia. 2.2 in.; Rod Length 6.535 in.; Chevrolet Big Block V8;

    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.)
    4.5
    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:
    BQ421KN

    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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