Eagle Forged 4340 LS Long Snout Crankshaft - 4.000" Stroke - 58X Reluctor

Overview

The Eagle Forged 4340 LS Long Snout Crankshaft is designed for serious LS engine builds that demand exceptional strength, durability, and reliability. Manufactured from premium 4340 forged steel, this crankshaft utilizes Eagle's non-twist forging process and features large .125" fillet radii, nitrided journals, and micropolished surfaces for maximum durability in high-performance naturally aspirated, nitrous, and forced induction applications.

Featuring a 4.000-inch stroke, 58-tooth reluctor wheel, and LS7-style long snout configuration, this crankshaft is ideal for popular 408, 416, and 427 LS combinations utilizing a dry-sump oiling system. The long snout design provides compatibility with LS7-style drive systems while delivering the strength needed for high-horsepower street and race applications.

Eagle's forged 4340 crankshafts are intended for the most demanding engine combinations. The nitrided surface treatment improves journal wear resistance, while the micropolished finish helps reduce friction and improve bearing life. Every crankshaft is supplied with a pre-installed 58X reluctor wheel and is designed for internal balancing.

This crankshaft must be balanced to match your specific piston and connecting rod combination before final engine assembly.

Key Features

Forged 4340 steel construction
LS7-style long snout design
4.000" stroke
58-tooth reluctor wheel included
Internal balance design
Non-twist forging process for increased strength
.125" fillet radii for superior durability
Nitrided journal surfaces
Micropolished journals to less than 2 Ra finish
Designed for high-performance naturally aspirated, nitrous, and boosted applications

Specifications

Material: Forged 4340 Steel
Stroke: 4.000"
Reluctor Wheel: 58 Tooth
Balance Style: Internal
Target Bobweight: 1800g
Rod Journal Diameter: 2.100"
Rod Journal Width: 1.900"
Main Journal Diameter: 2.559"
Minimum Rod Length: 6.125"
Snout Diameter: 1.480"
Flywheel Bolt Pattern: 6-Bolt
Approximate Weight: 56 lbs.

Fitment

GM LS-based engines requiring a 58X reluctor wheel
LS7-style dry-sump oiling applications
Popular 408, 416, 427 LS stroker combinations

Important Notes

Crankshaft must be balanced to match your specific piston and connecting rod combination.
Large .125" fillet radii require chamfered or narrowed rod and main bearings.
Designed for engines utilizing a 58X reluctor wheel.
Long snout design is intended for LS7-style dry-sump applications.
Professional balancing and engine assembly are recommended.