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Product Summary

3.750" Engine Stroke, I-Beam Connecting Rod Type

    Comes as a Kit

    See more details

    Key Specs

    MFG. Part #91510242
    BrandSpeedway Motors
    Connecting Rod TypeI-Beam
    Piston StyleDish
    Piston MaterialHypereutectic Aluminum
    See more specs

    Need To Know

    Quick and Easy Returns

    Return Policy

    Speedway Motors 91510242 Details

    These rotating assembly engine rebuild kits are designed for street use and include Keith Black Hypereutectic pistons, Speedway 5140 I-beam rods, main/rod bearings and a Speedway Cast Steel crankshaft. Rings not included. Journals are standard size.

    Due to larger journal side radius on this aftermarket crankshaft, you must use Clevite H-series, King bearings (included in kit) or equivalent.

    These assemblies will require balancing either by us or your machine shop.

    All balancing is done with our state-of-the-art Hines balancer by race mechanics with over 30 years of experience!  A kit purchased with the optional balance job will ship in 24-48 hours.

    Specs

    Kit features:

    • Speedway Cast Steel Crankshaft
      • Two-piece rear main
      • 80-60-06 cast steel
    • Speedway 5140 I-Beam Connecting Rods
      • Heat treated, shot peened and magnafluxed
      • 5.7" length
      • Set of 8 rods
      • Bushed pin
      • 658 grams
    • KB Hypereutectic Dished Pistons
      • T-5 heat treated aluminum construction 
      • 4.000" bore pistons available in .030, .040, or .060 sizes
      • 4.125" bore pistons available in .030 or .040 sizes

    Speedway Motors 91510242 Specifications

    KEY SPECS
    MFG. Part #91510242
    BrandSpeedway Motors
    Connecting Rod TypeI-Beam
    Piston StyleDish
    Piston MaterialHypereutectic Aluminum
    GENERAL
    Engine Stroke3.750"
    Connecting Rod Length5.700"
    Connecting Rod MaterialForged 5140 Steel
    Connecting Rod Weight588 grams
    Connecting Rod Bolt Diameter3/8"
    Piston Weight500 grams
    Piston Ring StyleA
    Crankshaft MaterialCast Steel
    Rear Main Seal Style2-piece
    Wrist Pin Diameter.9272"
    Wrist Pin Weight145 grams
    Main Journal Diameter2.448"
    Rod Journal Diameter2.10"
    Bearing ConstructionBi-metal
    Bearing UndersizeStandard
    Narrowed BearingYes
    Coated BearingNo
    Sold in QuantityKit

    Ratings & Reviews

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    Always coming back for more

    3.0

    9 years ago

    Herb

    Cassville, MO

    Verified

    Failed to notice that the rings were not included added a week to the project.

    Would Recommend

    Showing 1 of 1 reviews