Product Summary

350, 383, 350 mains Main Journal Style

  • Fits 350/383 Chevy Small Block V8
  • Includes cast steel crank, Keith Black Hypereutectic pistons, and Speedway 4340 full floating H-beam rods with ARP bolts
  • One-piece rear main seal
  • Hypereutectic aluminum piston material
  • Forged 4340 steel connecting rod

Comes as a Kit

Key Specs

MFG. Part #9151021
BrandSpeedway Motors
Connecting Rod TypeH-Beam
Piston StyleFlat Top
Piston MaterialHypereutectic Aluminum

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Speedway Motors 9151021 Details

These rotating assembly engine rebuild kits feature a new one piece rear main cast steel crank with standard size journals, Keith Black Hyperuetectic piston set, and Speedway 4340 full floating H-beam rods with ARP bolts.

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.

Item Details

Flat top, 650 g

C/R 58cc=11.9, 64cc=10.9, 76cc=9.6
Piston/Pin Weight: 650 g
Rod Length: 5.7", Ring Style: A     

Kits include:

  • Scat Cast Steel Crankshaft
    • One-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 " (622 grams) or 6.0 " (634 grams) lengths
    • 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
  • King HP Series Main and 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

Kits include:

  • (1) Scat 935050L 383 Chevy Cast Steel Crankshaft, 1-Piece Main, 5.7 Rod
  • (1) Small Block Chevy 5.7 H-Beam Connecting Rods, 4340 Steel, 7/16
  • (1) King HP Series Chevy 350/400 Large Journal Engine Rod Bearings
  • (1) King MB 557HP HP Series Chevy 350 Large Journal Main Bearings
  • (1) Keith Black Flat Top 5.7 Rod Chevy 383 Hypereutectic Pistons

Speedway Motors 9151021 Specifications

MFG. Part #9151021
BrandSpeedway Motors
Connecting Rod TypeH-Beam
Piston StyleFlat Top
Piston MaterialHypereutectic Aluminum
Main Journal Style350 mains
Engine Stroke3.750"
Connecting Rod Length5.700"
Connecting Rod MaterialForged 4340 Steel
Connecting Rod Weight622 grams
Connecting Rod Bolt Diameter7/16"
Piston Weight505 grams
Piston Ring StyleA
Crankshaft MaterialCast Steel
Rear Main Seal Style1-piece
Wrist Pin Diameter.9272"
Wrist Pin Weight145 grams
Main Journal Diameter2.448"
Rod Journal Diameter2.10"
Bearing ConstructionBi-metal
Bearing UndersizeStandard
Narrowed BearingYes
Coated BearingNo
Sold in QuantityKit