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Eagle Forged 4340 Steel Crankshafts
Crankshaft, 2-Piece Seal, Internal Balance, Forged 4340 Steel, 3.766 in. Stroke, Chevy, 396, 427, Each
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Estimated Ship Date: Dec 8, 2026
Overview
Brand:
Manufacturer's Part Number:
439637666135
Part Type:
Product Line:
Summit Racing Part Number:
ESP-439637666135
Item Number:
839625
UPC:
793348017006
Engine Stroke (in.):
3.766 in.
Crankshaft Material:
Forged 4340 steel
Engine Balance:
Internal
Rear Main Seal Style:
2-piece
Lightened:
No
Requires Narrow Bearings:
Yes
Rod Bearings Included:
No
Main Bearings Included:
No
Rod Journal Diameter (in.):
2.200
Main Journal Diameter (in.):
2.749 in.
Balancer Bolt Thread Size:
1/2 in.-20
Crankshaft Snout Style:
Standard
Quantity:
Sold individually.
Notes:
Does not feature a center counterweight.
Eagle Forged 4340 Steel Crankshafts
Eagle forged 4340 steel crankshafts are great for high performance applications. They feature non-twist forging, undergo a multi-stage heat-treatment process, and are stress-relieved and shot-peened. These cranks are X-rayed, magnafluxed, and sonic-tested, so you know you're getting a top-quality piece. Each crankshaft has chamfered oil holes for improved oiling, a .125 in. radius on rod and main journals for increased strength, and the journals are precision-ground and micro-polished to less than 5 R.A. A target bob weight of +/- 2 percent greatly reduces balancing time. Many options are available; order the model recommended for your year/make and engine application.
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Instructions & Calculators
Some parts are not legal for use in California or other states with similar laws / regulations
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