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Promo: AUGUST    Expires: 8/16/20
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Premium SB Chevy Rotating Assembly, 350 Flat Top, 5.7 In Rods
Premium SB Chevy Rotating Assembly, 350 Flat Top, 5.7 In Rods

Premium SB Chevy Rotating Assembly, 350 Flat Top, 5.7 In Rods

350 Chevy Small Block V8, 350 mains Main Journal Style, 3.480" Engine Stroke

2 Reviews | 7 Answered Questions
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Premium SB Chevy Rotating Assembly, 350 Flat Top, 5.7 In Rods
Premium SB Chevy Rotating Assembly, 350 Flat Top, 5.7 In Rods
Premium SB Chevy Rotating Assembly, 350 Flat Top, 5.7 In Rods
Premium SB Chevy Rotating Assembly, 350 Flat Top, 5.7 In Rods
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We estimate this item will ship on or before August 31st.
Part # 91510220
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KB Chevy 350 Hypereutectic Pistons, Flat Top, 5.7 Rod
KB Chevy 350 Hypereutectic Pistons, Flat Top, 5.7 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:
622 grams
Connecting Rod Bolt Diameter:
Piston Style:
Flat Top
Piston Material:
Hypereutectic Aluminum
Piston Weight:
535 grams
Piston Ring Style:
Crankshaft Material:
Cast Steel
Rear Main Seal Style:
Wrist Pin Diameter:
Wrist Pin Weight:
145 grams
Main Journal Diameter:
Rod Journal Diameter:
Bearing Construction:
Bearing Undersize:
Narrowed Bearing:
Coated Bearing:
MFG. Part #:
Sold in Quantity:


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

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 4340 H-beam Connecting Rods w/ ARP bolts
    • 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
  • Keith Black Signature Series Hypereutectic Pistons
    • T-5 heat treated aluminum construction
    • Super stiff design for maximum ring seal
    • 4.000" bore pistons available in .030, .040, or .060 sizes
    • 4.125" bore pistons available in .030 or .040 sizes
    • C/R 58cc=10.9, 64cc=10.2, 76cc=8.9
      Piston/Pin Weight: 680 g
      Rod Length: 5.7", Ring Style: A
  • 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

Item Details

Flat top, 680 g

Important Messages:

  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
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.
  • Speedway Chevy 350 Crankshaft, Two-Piece Main
    Qty x 1
  • Small Block Chevy 5.7 H-Beam Connecting Rods, 4340 Steel, 7/16
    Qty x 1
  • KB Chevy 350 Hypereutectic Pistons, Flat Top, 5.7 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

More Like This


Q & A

Videos & Articles
  • Learn about the importance of getting the chain tension set correctly, and why it is critical that we get it as near perfect as we can. Walkthrough a basic procedure that effectively and consistently gets the chain tension set properly every time.
  • 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.
  • 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.
  • Professional insight on some useful crate engine tools that will improve your engine building experience.

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