Product Summary

350, 350 mains Main Journal Style, 3.480" Engine Stroke

    Comes as a Kit

    Key Specs

    MFG. Part #9151020
    BrandSpeedway Motors
    Connecting Rod TypeH-Beam
    Piston StyleFlat Top
    Piston MaterialHypereutectic Aluminum

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    These rotating assembly engine rebuild kits feature a new one piece rear main cast steel crank with standard size journals, Keith Black Hyperuetectic piston set, and Speedway 4340 full floating H-beam rods with ARP bolts.

    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.

    NOTE: Piston rings are not included and must be purchased separately.

    Kits include:

    • Scat Cast Steel Crankshaft
      • One-piece rear main
      • 80-60-06 cast steel construction
      • Fatigue-resistant with near forged steel endurance
      • Standard size journals
    • Speedway 4340 H-beam Connecting Rods w/ ARP bolts
      • Full floating pin in silicon bronze bushing
      • Precision bolt bushings to positively locate cap
      • 5.7" (622 grams) or 6.0" (634 grams) lengths 
      • Weight matched set of 8 rods
    • Keith Black Signature Series Hypereutectic Pistons
      • T-5 heat treated aluminum construction
      • Super stiff design for maximum ring seal
      • 4.000" bore pistons available in .030, .040, or .060 sizes
      • C/R 58cc=10.9, 64cc=10.2, 76cc=8.9
        Piston/Pin Weight: 680 g
        Rod Length: 5.7", Ring Style: A
    • King HP Series Main & Rod Bearings
      • 0.015" thick top layer for superior macro particle embedability and conformability
      • 40 Vickers hardness to resist overlay migration and extrusion
      • 450°F heat threshold for superior protection against friction and overheating
      • Mains are 3/4 grooved for improved oiling to the rod journals
      • Bi-metal aluminum silicon alloy featuring fine micro-bore finish

    Item Details

    Flat top, 680 g


    MFG. Part #9151020
    BrandSpeedway Motors
    Connecting Rod TypeH-Beam
    Piston StyleFlat Top
    Piston MaterialHypereutectic Aluminum
    Main Journal Style350 mains
    Engine Stroke3.480"
    Connecting Rod Length5.700"
    Connecting Rod MaterialForged 4340 Steel
    Connecting Rod Weight622 grams
    Connecting Rod Bolt Diameter7/16"
    Piston Weight535 grams
    Piston Ring StyleA
    Crankshaft MaterialCast Steel
    Rear Main Seal Style1-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