Chevy Small Block 4340 Forged Superlight Competition Rotating Assembly 355ci
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SCATPART NUMBER: 942-1-40570

Chevy Small Block 4340 Forged Superlight Competition Rotating Assembly 355ci

$4,04034$4252.99You Save$212.65
ShippingShips on 09/21/2026
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350 Main Journals
  • 355 Cubic Inch
  • 3.500'' Crank Stroke
  • 2-Piece Rear Seal
    • Chevy Small Block 4340 Forged Superlight Competition Rotating Assembly
    • 355ci
    • 4.030'' Bore
    • 10.6:1 Flat Top Piston w/64cc Combustion Chamber
    • 3.500'' Crank Stroke
    • 6.000'' Rod Length
    • Unbalanced Assembly


      NOTE: This assembly is unbalanced.

      Assembly Includes:
    • 4340 Forged Superlight Cranks
    • Q-Lite H-Beam Connecting Rods with 3/8' Cap Screws
    • SRP Professional Pistons & Rings
    • Rod Bearings
    • Main Bearings

      Super Light Design and Competition Proven!

      Rotating Assembly with SRP Professional Series Pistons
      Scat rotating assembly component parts are designed for the ultimate in performance. They take the ''guess work'' out of engine assemblies, just wash, Q.C. and assemble. The heart of this assembly is the Superlight design crankshaft. This race crank starts by being precision ground and nitrided hardened for superior wear resistance. Key features of the Superlight crankshaft are the aero wing counterweights, pendulum undercut counter weights, rod journals are bridge for increased strength and lightening holes in all rod journals, large radius on all journals, straight shot and chamfered oil holes make this crankshaft super light and the racers top choice!

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      This Assembly features Scat Q-Lite H-Beam or Ultra Q-Lite Stroker H-Beam 4340 forged connecting rods. They are a bushed pin design. They are shipped 100% ready to install with ARP cap screws and feature special doweled cap and profiled clearance. The Formula ''1'' style lightening hole which reduces big-end weight, but does not compromise strength.





      The pistons are SRP Professional Series which are an advanced, lightweight FSR forging that eliminates stress concentrations for superior strength, Up to 20% lighter than traditional equivalent, High-silicon 4032 aluminum alloy for reduced piston-to-wall clearance and quiet operation, Accumulator grooves for improved ring seal, Designed for normally aspirated or moderate forced induction/nitrous applications, and now includes high performance skirt coating! Lightweight, low friction metric piston ring package is included. It features 1.2mm top ring, 1.5mm Napier 2nd ring, 3.0mm standard tension oil ring. The Napier 2nd ring was chosen for improved oil control. Minimal filing required. High quality 2.250'' piston pins further reduces reciprocating weight. Carbon steel wire locks included.





      Rod and main bearings are included with each rotating assembly. The bearings are chosen by Scat from the most respected names in the business such as Clevite, King, and Federal Mogul, that best works with each premium crankshaft and rotating assembly.





      Scat has been manufacturing and distributing crankshafts, connecting rods and engine components for the automotive aftermarket since the early 1960's. This tradition continues to this day with their 42,000 square foot manufacturing facility in Redondo Beach, California, USA! All Scat engine components are made with quality at the forefront, starting with only the best materials. All of their highly trained and skilled craftsman use Scat's innovation, creativity and dedication to produce you the absolute best parts possible.

    Part TypeEngine Rotating Assembly Kit
    Product LineScat Small Block Chevy 4340 Forged Superlight Competition Rotating Assembly
    BrandSCAT
    Package Height14.0
    Package Width19.0
    Package Length26.0
    Weight82.0 PG
    Part CategoryPerformance Parts
    Crankshaft MaterialForged 4340 steel
    Piston And Ring Oversize0.03 in (0.8 mm)
    Main Bearing Undersize (Mm)Stock
    Wrist Pin StyleFloating
    Connecting Rod Beam StyleH-beam
    Rod Bearing Undersize (Mm)Stock
    Piston Ring Facing MaterialPlasmamoly
    Piston StyleFlat top, with two valve reliefs
    Assembly Lubricant IncludedNo
    Piston Head Volume (Cc)5
    Gaskets IncludedNo
    Rear Main Seal Style2-piece
    Main Bearing Undersize (In.)Stock
    Crankshaft IncludedYes
    Piston Rings IncludedYes
    Bore (Mm)102.362
    Actual Engine Cid357
    Engine Stroke3.5 in (88.9 mm)
    Connecting Rod MaterialForged 4340 steel
    Pistons IncludedYes
    Rod Bearing Undersize (In.)Stock
    QuantitySold as a kit
    Main Bearings IncludedYes
    Engine BalanceInternal
    Rod Bearings IncludedYes
    Connecting Rods IncludedYes
    Oil Pump IncludedNo
    Camshaft IncludedNo
    Timing Chain And Gears IncludedNo
    BalancedNo
    Piston MaterialForged aluminum
    Cam Bearings IncludedNo
    Part FitmentSemi Universal
    Plastigage IncludedNo
    Lifters IncludedNo
    Bore4.03 in (102.362 mm)
    Vendor Part Number1-40570
    Package Qty1
    Package TypeEA
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