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Forged SB Chevy Rotating Assembly, 350 Flat Top, H-Beam, 6 Rod
Forged SB Chevy Rotating Assembly, 350 Flat Top, H-Beam, 6 Rod

Forged SB Chevy Rotating Assembly, 350 Flat Top, H-Beam, 6 Rod

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Forged SB Chevy Rotating Assembly, 350 Flat Top, H-Beam, 6 Rod
Forged SB Chevy Rotating Assembly, 350 Flat Top, H-Beam, 6 Rod
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Part # 9151230
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Icon Chevy 350 Forged Pistons, Flat Top, 6.0 Rod
Icon Chevy 350 Forged Pistons, Flat Top, 6.0 Rod
Quantity: 1
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Piston Material:
Forged Aluminum
Connecting Rod Type:
Connecting Rod Length:
Crankshaft Material:
Forged 4340 Steel
Rear Main Seal Style:
Main Journal Style:
350 mains
Piston Style:
Flat Top
Piston Ring Style:
Piston Weight:
439 grams
Wrist Pin Weight:
132 grams
Wrist Pin Diameter:
Connecting Rod Material:
Forged 4340 Steel
Connecting Rod Weight:
638 grams
Connecting Rod Bolt Diameter:
Main Journal Diameter:
Rod Journal Diameter:
Bearing Construction:
Bearing Undersize:
Narrowed Bearing:
Coated Bearing:
Sold in Quantity:


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.

Chevy 383: 4.000" bore x 3.48" stroke

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

Item Details

Flat top, 439 g.

C/R 58cc=11.2, 64cc=10.4, 76cc=9.1
Piston/Pin Weight: 571 g
Rod Length: 6"     


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
  • Speedway 4340 H-beam Connecting Rods
    • Full floating pin in silicon bronze bushing
    • Precision bolt bushings to positively locate cap
    • 6.0" lengths
    • 634 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
Some parts are not legal for use in California or other states with similar laws/regulations

Related Products

What's In The Kit

Each kit from Speedway Motors is carefully packaged and delivered right to your door. Below is a list of all the items you should expect to receive when you order this kit. Some of these items may also be available for sale individually if you're here looking for replacement parts.
  • Scat 435010 Chevy 350 Crankshaft, 4340 Forged, 3.48 Stroke, 350 Main
    Qty x 1
  • Small Block Chevy 6.0 H-Beam Connecting Rods, 4340 Steel, 7/16
    Qty x 1
  • Icon Chevy 350 Forged Pistons, Flat Top, 6.0 Rod
    Qty x 1
  • King HP Series Chevy 350/400 Large Journal Engine Rod Bearings, Std
    Qty x 1
  • King HP Series Chevy 350 Large Journal Engine Main Bearings-Standard
    Qty x 1

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