Product Summary

400 mains Main Journal Style, 3.750" Engine Stroke

    Comes as a Kit

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    Key Specs

    MFG. Part #91510252
    BrandSpeedway Motors
    Connecting Rod TypeI-Beam
    Piston StyleDish
    Piston MaterialHypereutectic Aluminum
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    Need To Know

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    Speedway Motors 91510252 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.

    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
      • 6.0 " length
      • Bushed pin
      • 597 grams
      • Set of 8 rods
    • 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

    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
      • 6.0 " length
      • Bushed pin
      • 597 grams
      • Set of 8 rods
    • 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 91510252 Specifications

    KEY SPECS
    MFG. Part #91510252
    BrandSpeedway Motors
    Connecting Rod TypeI-Beam
    Piston StyleDish
    Piston MaterialHypereutectic Aluminum
    GENERAL
    Main Journal Style400 mains
    Engine Stroke3.750"
    Connecting Rod Length6.000"
    Connecting Rod MaterialForged 5140 Steel
    Connecting Rod Weight620 grams
    Connecting Rod Bolt Diameter3/8"
    Piston Weight430 grams
    Piston Ring StyleC
    Crankshaft MaterialCast Steel
    Rear Main Seal Style2-piece
    Wrist Pin Diameter0.9272"
    Wrist Pin Weight145 grams
    Main Journal Diameter2.648"
    Rod Journal Diameter2.10"
    Bearing ConstructionBi-metal
    Bearing UndersizeStandard
    Narrowed BearingYes
    Coated BearingNo
    Sold in QuantityKit

    Questions & Answers

    7 Questions • 7 Answers

    Are the pistons 4032 or 2617 hypereutectic?

    by Jeffrey

    • 9 months ago

    1 answer

    What harmonic balancer and flywheel would be needed if l use you balancing option?

    by Jeffrey

    • 10 months ago

    1 answer

    Is this a d-dish piston?

    by Matt

    • 3 years ago

    1 answer

    Are these pistons grooved to have full floating piston pins and are the pin retaining clips included

    by RICHARD

    • 4 years ago

    1 answer

    What compression ratios with 64 and 72 cc heads? etc?

    by Larry

    • 6 years ago

    1 answer

    What is the dish volume and the compression distance

    by Aero

    • 9 years ago

    1 answer

    I was wondering if the block needs too be clearenced for the 6 inch rods and if I would have too use a 520 base circle camshaft?

    by fast eddie

    • 15 years ago

    1 answer

    7 of 7 questions shown

    Fitment

    • 2-Piece Rear Main Chevy 400

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    • 2-Piece Rear Main Chevy 400

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    • 2-Piece Rear Main Chevy 400

    • 2-Piece Rear Main Chevy 400

    • 2-Piece Rear Main Chevy 400

    • 2-Piece Rear Main Chevy 400

    • 2-Piece Rear Main Chevy 400

    • 2-Piece Rear Main Chevy 400

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