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Light Forged Small Block Chevy Assembly, 434 Flat Top, 6 Rod, 350 Mains
Light Forged Small Block Chevy Assembly, 434 Flat Top, 6 Rod, 350 Mains

Light Forged Small Block Chevy Assembly, 434 Flat Top, 6 Rod, 350 Mains

400 Chevy Small Block V8, 434 Chevy Small Block V8, 350 mains Main Journal Style

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Light Forged Small Block Chevy Assembly, 434 Flat Top, 6 Rod, 350 Mains
Light Forged Small Block Chevy Assembly, 434 Flat Top, 6 Rod, 350 Mains
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Part # 9153060
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Important Messages:

  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
  • This item 9153060 is made to order. It will be shipped from our warehouse when it is produced.


Main Journal Style:
350 mains
Cylinder Bore Size:
Select Oversize to see
Engine Stroke:
Connecting Rod Type:
Connecting Rod Length:
Connecting Rod Material:
Forged 4340 Steel
Connecting Rod Weight:
629 grams
Piston Style:
Flat Top
Piston Diameter:
Select Oversize to see
Piston Material:
Forged Aluminum
Piston Weight:
420 grams
Piston Ring Style:
Crankshaft Material:
Forged 4340 Steel
Rear Main Seal Style:
Wrist Pin Diameter:
Main Journal Diameter:
Rod Journal Diameter:
Bearing Construction:
Bearing Undersize:
Narrowed Bearing:
Coated Bearing:
MFG. Part #:
Select Oversize to see
Sold in Quantity:


Our lightweight forged rotating assembly engine rebuild kits include a 44-45 lb. Scat Superlight 4340 forged 2-pc rear main seal crankshaft, Scat 4340 forged I-beam connecting rods and Mahle pistons complete with wrist pins, locks and rings. Rod and main bearings included. Standard size journals.

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 included balance job will ship in 24-48 hours.

Choose from standard or .020 oversize.

NOTE: These rotating assemblies may require additional charges for heavy metal.

Item Details

Flat top, 420 g
Comp. 64cc: 12.3
Ring Style: E
4.125" bore x 4" stroke


Kit includes:

  • Scat 4340 Lightweight Forged Steel Crankshaft
    • Standard size journals
    • Profiled aero-wing counterweights
    • Pendulum cut to reduce rotating mass 
    • Straight shot and chamfered oil holes
    • Nitride hardened and shot peened
    • Lightening holes in all rod throws
    • Large radius on all journals
  • Scat Pro Comp 4340 I-Beam Rods
    • Stroker clearanced
    • ARP 7/16" cap screw bolts
    • Bushed pin
    • Set of 8 rods
    • 6.0" rod: 629 grams
    • Crank pin: 2.100"
    • Wrist pin: .927"
    • B.E. width: .940"
  • Mahle PowerPak Forged Pistons 
    • Lightweight slipper skirt design
    • Phosphate coated
    • Grafel anti-friction skirt coating
    • 4.000" bore pistons available in standard, .030, .040, or .060 sizes
    • 4.125" bore pistons available in standard, .030 or .040 sizes
    • Set of 8 pistons
    • Includes low drag rings, lightweight wrist pins and round wire locks
  • 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

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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.
Select a Oversize above to see what items are in this kit.

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