Description
Big Block Chevy
Crankshaft – Compstar – 4.250 in Stroke – Internal Balance – Forged Steel – 2 Piece Seal – Big Block Chevy – Each
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Alternate Description
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BBC 4340 FORGED COMPSTAR CRANK – 4.250 STROKE
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Part Number
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CALBBP425-CS
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Vendor Part Number
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BBP-425-CS
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Package Weight
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Package Length
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Package Width
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Package Height
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Lightened
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Yes
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1 / 2 Piece Rear Main Seal
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2-Piece
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Nitrided
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Yes
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Stroke
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4.250 in
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Main Journal Diameter
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2.750 in
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Rod Journal Diameter
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2.200 in
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Journal Radius
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0.125 in
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Narrowed Bearings Required
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Yes
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Intended Balance
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Internal
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Minimum Rod Length
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6.385 in
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Snout Style
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Standard
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Counterweight Location
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Center
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Counterweight Quantity
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8
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Balancer Bolt Thread
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1/2-20 in
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Crankshaft Key Quantity
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2
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Flexplate / Flywheel Mounting Bolt Quantity
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6
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Alloy
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4340
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Material Style
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Forged
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Material
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Steel
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