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Part # 9151220

Forged SB Chevy Rotating Assembly, 350 Flat Top, H-Beam, 5.7 Rods

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  • Crankshaft features straight shot and chamfered oil holes
  • There are lightening holes in all rod throws
  • Pistons feature a 2618 aluminum alloy construction

$1,684.99

kit

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$1,772.95

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Product Summary

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

  • Crankshaft features straight shot and chamfered oil holes
  • There are lightening holes in all rod throws
  • Pistons feature a 2618 aluminum alloy construction
  • Connecting rods have full floating pin in silicon bronze bushings
  • Main and rod bearings feature 40 Vickers hardness to resist overlay migration and extrusion

Comes as a Kit

Key Specs

MFG. Part #9151220
BrandSpeedway Motors
Connecting Rod TypeH-Beam
Piston StyleFlat Top
Piston MaterialForged Aluminum

Need To Know

This Product Will Ship Free

Quick and Easy Returns

Details

Speedway introduces forged rotating assemblies, with an optional balance job. Includes new 2-pc rear main seal crank, rods and pistons. Cranks are new so they use standard size bearings. All Scat 4340 cranks are 2-piece rear main seal, internally balanced and weigh approximately 51-55 lbs.

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. These rotating assembly engine rebuild kits may require additional charges for heavy metal.

If you are going to run this crank in a sprint car motor, you must have the crank flange turned down prior to balancing the crank to allow it to go through the motor plate.

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

Kits feature: 

  • Scat 4340 Forged Steel Crankshaft    
    • Standard size journals
    • Straight shot and chamfered oil holes
    • Nitride hardened and shot peened
    • Lightening holes in all rod throws
    • Large radius on all journals
  • KB Signature Series Forged Pistons 
    • 2618 aluminum alloy construction
    • T-6 heat treated 
    • 4.000" bore pistons available in standard, .030, .040, or .060 sizes
    • 4.125" bore pistons available in .030 or .040 sizes
    • C/R 58cc=11.2, 64cc=10.4, 76cc=9.1
      Piston/Pin Weight: 634 g
      Rod Length: 5.7"     
  • Speedway 4340 H-beam Connecting Rods
    • 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
  • 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
  • Chevy 350: 4.000" bore x 3.48" stroke

Item Details

Flat top, 500 g.

Specifications

KEY SPECS
MFG. Part #9151220
BrandSpeedway Motors
Connecting Rod TypeH-Beam
Piston StyleFlat Top
Piston MaterialForged 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 Weight499 grams
Piston Ring StyleC
Crankshaft MaterialForged 4340 Steel
Rear Main Seal Style2-piece
Wrist Pin Diameter.9272"
Wrist Pin Weight135 grams
Main Journal Diameter2.448"
Rod Journal Diameter2.10"
Bearing ConstructionBi-metal
Bearing UndersizeStandard
Narrowed BearingYes
Coated BearingNo
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