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Product Summary

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

  • Crankshaft is specifically deigned for the two-piece rear main
  • Connecting rods are manufactured from 5140 heat treated steel for added durability
  • Overall length of the connecting rods is 5.7" and weigh a total of 646 grams
  • Pistons have coated skirts and wrist pin lock rings

Comes as a Kit

Key Specs

MFG. Part #91510208
BrandSpeedway Motors
Connecting Rod TypeI-Beam
Piston StyleDome
Piston MaterialHypereutectic Aluminum

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Speedway Motors 91510208 Details

Speedway introduces rotating assembly engine rebuild kits, with an optional balance job. Includes 2-pc rear main seal cast steel crank, rods and pistons. 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.

Item Details

0.150" solid dome
Ring style: A

C/R 58cc=12.7, 64cc=11.6, 76cc=10.1
Piston/Pin Weight: 762 g
Rod Length: 5.7"     

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 5140 I-Beam Claimer Connecting Rods
    • 5140 heat treated steel
    • Shot peened and magnafluxed
    • 5.7 " length
    • Press pin
    • 646 grams
  • KB Signature Series Hypereutectic Claimer Pistons
    • Coated skirts
    • Wrist pin lock rings
    • T-5 hypereutectic construction
    • Can be used with press fit or floating wrist pins

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 5140 I-Beam Claimer Connecting Rods
    • 5140 heat treated steel
    • Shot peened and magnafluxed
    • 5.7 " length
    • Press pin
    • 646 grams
  • KB Signature Series Hypereutectic Claimer Pistons
    • Coated skirts
    • Wrist pin lock rings
    • T-5 hypereutectic construction
    • Can be used with press fit or floating wrist pins

Speedway Motors 91510208 Specifications

KEY SPECS
MFG. Part #91510208
BrandSpeedway Motors
Connecting Rod TypeI-Beam
Piston StyleDome
Piston MaterialHypereutectic Aluminum
GENERAL
Main Journal Style350 mains
Engine Stroke3.480"
Connecting Rod Length5.700"
Connecting Rod MaterialForged 5140 Steel
Connecting Rod Weight646 grams
Connecting Rod Bolt Diameter3/8"
Dome Height0.150"
Piston Weight660 grams
Piston Ring StyleA
Crankshaft MaterialCast Steel
Rear Main Seal Style2-piece
Wrist Pin Diameter.9272"
Wrist Pin Weight102 grams
Main Journal Diameter2.448"
Rod Journal Diameter2.10"
Bearing ConstructionBi-metal
Bearing UndersizeStandard
Narrowed BearingYes
Coated BearingNo
Sold in QuantityKit