Premium SB Chevy Rotating Assembly, 377 Flat Top, 5.7 In Rods

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.

NOTE: 377 Kit includes main bearing spacers

Item Details

Flat top, 725 g

(377) C/R 58cc=11.5, 64cc=10.7, 76cc=9.4
(400) C/R 58cc=12.3, 64cc=11.4, 76cc=10.1
Piston/Pin Weight: 580 g
Rod Length: 5.7(377), 5.565(400)
Ring Style: A     

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
• 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:

• 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
• 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