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Scat 440050 400 Chevy 4340 Forged Crankshaft, 3.75 Stroke, 400 Main

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Specs
Weight:
55.0
Sold in Quantity:
Each
Stroke:
3.750
MFG. Part #:
440050
Main Journal Style:
400 mains
Rod Journal Diameter:
2.10"
Rear Main Seal Style:
2-piece
Garage Sale:
No
Main Journal Diameter:
2.648
Crankshaft Material:
Forged 4340 Steel
Scat 440050 400 Chevy 4340 Forged Crankshaft, 3.75 Stroke, 400 Main

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What's in the Box

As you make more and more power it becomes more important to use quality parts. These Scat 4340 forged steel cranks will help keep your motor alive.

  • For 2-piece rear main blocks
  • 2.100" rod pin
  • 55 lbs.
  • Straight shot & chamfered oil holes
  • Nitride hardened for superior wear reisistance
  • Lightening holes in all rod throws
  • Large radius on all journals
  • Heat treated, shot peened
  • Designed at SCAT
  • Engineered at SCAT
  • Inspected & micropolished at SCAT

Item Details

3.75" stroke - 400 mains

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  • For 2-piece rear main blocks
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  • Straight shot oil holes
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Item Details

NOTE: Cut for a 5.7 Rod and will NOT fit stock 5.565 rod
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New, hi-tech fatigue resistant 80-60-06 cast steel crank with near forged steel endurance. All journals are ground and polished to exacting tolerances. Superior quality stock replacement crank at a value price.

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Item Details

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Scat 4-400-4000-6000 434 Chevy 4340 Forged Crankshaft, 4.00 Stroke
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As you make more and more power it becomes more important to use quality parts. These Scat 4340 forged steel cranks will help keep your motor alive.

  • Straight shot & chamfered oil holes
  • Nitride hardened for superior wear reisistance
  • Lightening holes in all rod throws
  • Large radius on all journals
  • Heat treated, shot peened
  • Designed at SCAT
  • Engineered at SCAT
  • Inspected & micropolished at SCAT
  • For 2-piece rear main blocks
  • 2.100" rod pin
  • 55 lbs.

Item Details

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Scat 440076 421 Chevy 4340 Forged Crankshaft, 3.875 Stroke, 400 Main
(Part #91515574)
                        

As you make more and more power it becomes more important to use quality parts. These Scat 4340 forged steel cranks will help keep your motor alive.

  • Straight shot & chamfered oil holes
  • Nitride hardened for superior wear reisistance
  • Lightening holes in all rod throws
  • Large radius on all journals
  • Heat treated, shot peened
  • Designed at SCAT
  • Engineered at SCAT
  • Inspected & micropolished at SCAT
  • For 2-piece rear main blocks
  • 2.100" rod pin
  • 55 lbs.

Item Details

3.875" stroke - 400 mains - 6.0" rods
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Beginning with properly placed counterweights that not only improve balance but reduce bearing loads, every aspect of these highly stressed components has been analyzed. The forgings are rough machined in a process that includes double stress relief operations that make these crankshafts very dimensionally stable.

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                        Clevite's H-Series was developed primarily for use in NASCAR type racing, but  they are suitable for all types of competition engines. These sets are for 1970-1980 S/B Chevy 400 c.i. V-8 engines.   
  • Use H-series bearings with crankshafts that have oversize fillets and where engines run in the medium to high RPM range.
  • H-Series bearings should be used if contact patterns obtained with P-series parts are too narrow. Contact pattern should ideally cover 2/3 to 3/4 of the bearing surface.
  • The X001 option has .001" more bearing/oil clearance
  • If you aren't sure which type of performance bearing to start with, the H-Series will be your best choice.

H-Series Features (Link)

Clevite 1969-Up Chevy H Series Rod Bearings Large Journal-Standard
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                        Clevite's H-Series was developed primarily for use in NASCAR type racing, but  they are suitable for all types of competition engines. These sets are  specifically for 1969-Up 302-305-327-350 S/B Chevy "Large Journal" engine (with 2.100" rod  journals).
  • Use H-series bearings with crankshafts that have oversize fillets and where engines run in the medium to high RPM range.
  • H-Series bearings should be used if contact patterns obtained with P-series parts are too narrow. Contact pattern should ideally cover 2/3 to 3/4 of the bearing surface.
  • If you aren't sure which type of performance bearing to start with, the H-Series will be your best choice.
  • X001 has .001" extra bearing clearance

H-Series Features (Link)
Elgin EPL-4 Assembly Lube, 4 Oz.
(Part #9154040)
                        

Eliminates galling, metal transfer and oil starvation during initial break-in. Adheres to metal surfaces, will not drain off. Apply to bearings, gears, crankshafts, cam lobes, valve stems, lifters and all mating parts with close tolerances.

For gas, alcohol and nitro engines.

Learn why using assembly lube is so important in our tech article, Installing New Hardware.