Product Summary

350, 383, 350 mains Main Journal Style, Balanced

  • For 350 and 383 Chevy small block V8's
  • 11.3:1 compression
  • Kit includes pistons, I-beam rods, forged steel crankshaft, and main & rod bearings
  • 6" connecting rod length
  • Forged aluminum pistons

Comes as a Kit

Key Specs

MFG. Part #9153040
BrandSpeedway Motors
Connecting Rod TypeI-Beam
Piston StyleFlat Top
Piston MaterialForged Aluminum

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Speedway Motors 9153040 Details

Our lightweight forged rotating assembly engine rebuild kits include a 45-46 lb. Scat Superlight 4340 forged 2-pc rear main seal internally balanced 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.

Kit includes balancing which is done with our state-of-the-art Hines balancer by race mechanics with over 30 years of experience.  A kit will ship in 24-48 hours.



Item Details

Flat top, 406 g
Comp. 64cc: 11.3
Ring Style: E

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 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

Speedway Motors 9153040 Specifications

MFG. Part #9153040
BrandSpeedway Motors
Connecting Rod TypeI-Beam
Piston StyleFlat Top
Piston MaterialForged Aluminum
Speedway Motors Catalog Part #915-3040
Main Journal Style350 mains
Engine Stroke3.750"
Connecting Rod Length6.000"
Connecting Rod MaterialForged 4340 Steel
Connecting Rod Weight605 grams
Connecting Rod Bolt Diameter7/16"
Piston Weight406 grams
Piston Ring StyleE
Crankshaft MaterialForged 4340 Steel
Rear Main Seal Style2-piece
Wrist Pin Diameter.9272"
Main Journal Diameter2.448"
Rod Journal Diameter2.10"
Bearing ConstructionBi-metal
Bearing UndersizeStandard
Narrowed BearingYes
Coated BearingNo
Sold in QuantityKit