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Forged steel crankshaft for big block Chevy, 4.250 inch stroke

EAGLE

EAGLE 4.250 in Stroke Forged Steel Big Block Chevy Crankshaft

SKU CH-7ZTJ-R0D60

Forged-steel crankshaft with a 4.250 in stroke and internal balance for Big Block Chevy engines, sold individually

  • 250 in stroke delivers longer power stroke
  • forged steel construction withstands high cylinder pressures
  • internal balance eliminates need for heavy external weights
  • one-piece rear seal simplifies assembly and sealing

Forged Steel Crankshaft for Big Block Chevy

This Eagle crankshaft is a new forged-steel unit built for Big Block Chevrolet engines. It features a 4.250 in stroke and an internal-balance design with a one-piece rear seal. The part is sold individually for engine builders and restorers who need a durable rotating assembly component.

Internal balance and one-piece seal

The internal-balance configuration removes the need for an externally weighted harmonic balancer or flywheel, freeing up space at the front and rear of the block. The one-piece rear seal simplifies sealing against oil leaks compared with two-piece designs. Builders using externally balanced components or two-piece seal blocks should select a different crankshaft.

Highlights

  • 250 in stroke delivers longer power stroke
  • forged steel construction withstands high cylinder pressures
  • internal balance eliminates need for heavy external weights
  • one-piece rear seal simplifies assembly and sealing

Specifications

BrandEAGLE

Questions about this item

What RPM limit does the 4.250 in stroke forged-steel crankshaft reach under sustained high-load use?

The forged-steel construction and internal-balance design raise the safe sustained RPM ceiling well above cast units, but the exact limit depends on rod length, piston weight and bearing clearances chosen for the build.

How much heat does the 4.250 in stroke crank generate during all-day operation?

Forged steel dissipates heat more evenly than cast iron, so oil temperatures stay stable during extended runs provided the cooling system and oil capacity match the engine's output.

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