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Product Summary

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

  • This complete rotating assembly is specially designed for the Small Block Chevy engine
  • Crankshaft has a two-piece rear main and features a 80-60-06 cast steel construction
  • Rods have a full floating pin in silicon bronze bushing
  • Pistons are manufactured from T-5 heat treated aluminum and have a super stiff design for maximum ring seal
  • Bearings feature a 450°F heat threshold for superior protection against friction and overheating

Comes as a Kit

Key Specs

MFG. Part #91510220
BrandSpeedway Motors
Connecting Rod TypeH-Beam
Piston StyleFlat Top
Piston MaterialHypereutectic Aluminum

Need To Know

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Details

Speedway introduces premium rotating assembly engine rebuild kits, with an optional balance job. Includes new 2-pc rear main seal cast steel crank, rods, pistons rod & main bearings. Cranks are new so they use standard size bearings.

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:

  • Speedway Cast Steel Crankshaft
    • Two-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" lengths
    • 622 grams
    • 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
    • 4.125" bore pistons available in .030 or .040 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

Specifications

KEY SPECS
MFG. Part #91510220
BrandSpeedway Motors
Connecting Rod TypeH-Beam
Piston StyleFlat Top
Piston MaterialHypereutectic Aluminum
GENERAL
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 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