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Forged SB Chevy Rotating Assembly, 383 Flat Top, H-Beam, 6 Rod
Forged SB Chevy Rotating Assembly, 383 Flat Top, H-Beam, 6 Rod

Forged SB Chevy Rotating Assembly, 383 Flat Top, H-Beam, 6 Rod

350 Chevy Small Block V8, 383 Chevy Small Block V8, 350 mains Main Journal Style

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Forged SB Chevy Rotating Assembly, 383 Flat Top, H-Beam, 6 Rod
Forged SB Chevy Rotating Assembly, 383 Flat Top, H-Beam, 6 Rod
Forged SB Chevy Rotating Assembly, 383 Flat Top, H-Beam, 6 Rod
Forged SB Chevy Rotating Assembly, 383 Flat Top, H-Beam, 6 Rod
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We estimate this item will ship on or before December 15th.
Part # 9151260
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  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.

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Icon Chevy 383 Forged Pistons, Flat Top, 6.0 Rod
Icon Chevy 383 Forged Pistons, Flat Top, 6.0 Rod
Quantity: 1
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Main Journal Style:
350 mains
Engine Stroke:
Connecting Rod Type:
Connecting Rod Length:
Connecting Rod Material:
Forged 4340 Steel
Connecting Rod Weight:
638 grams
Connecting Rod Bolt Diameter:
Piston Style:
Flat Top
Piston Material:
Forged Aluminum
Piston Weight:
410 grams
Piston Ring Style:
Crankshaft Material:
Forged 4340 Steel
Rear Main Seal Style:
Wrist Pin Diameter:
Wrist Pin Weight:
132 grams
Main Journal Diameter:
Rod Journal Diameter:
Bearing Construction:
Bearing Undersize:
Narrowed Bearing:
Coated Bearing:
MFG. Part #:
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 3.75" stroke

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

Item Details

Flat top, 410 g.
Features internally balanced 383 crankshaft - use balance option # 915-10200

C/R 58cc=12.0, 64cc=11.1, 76cc=9.8
Piston/Pin Weight: 542 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 4-350-3750-5700 383 Chevy 4340 Forged Crankshaft, 3.75 Stroke
    Qty x 1
  • Small Block Chevy 6.0 H-Beam Connecting Rods, 4340 Steel, 7/16
    Qty x 1
  • Icon Chevy 383 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 MB 557HP HP Series Chevy 350 Large Journal Main Bearings
    Qty x 1

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Q & A

Videos & Articles
  • Step back in time with our modern reproduction of the iconic Chevy 461 double hump cylinder heads, now cast in lightweight aluminum! In this video, Joe and Wyatt discuss the features that bring the vaunted camel hump heads into the 21st Century.
  • Speedway Motors employee Pat joins us once again. This time Pat is talking to the Model A and Model T owners, specifically in regards to Moto-Meters and accessories.
  • In this Tech Tip, John discusses LT1 rotating assembly options for a customer looking to build a solid autoX, drag, and occasional strip powerplant for his Firebird.
  • There are a few things to consider before you select a replacement flexplate for your small-block Chevy engine. Speedway has some useful tips to follow that will help speed up the process.

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