Manley Chevrolet LT1 Directed Injected 4340 Forged 4.00in Stroke Pro Series Crankshaft

we're providing the core strength your engine build demands. The Pro Series 4340 Alloy Steel Crankshaft is an efficient and precisely balanced foundation for performance, built not just to survive, but to handle extremes across a wide range of applications.

Additional Information

Manley Crankshaft, CRANK-4340 4.000 STROKE

Part Type

Engine Crankshaft

• 100% magnaflux-inspected
• 4340 Non-Twist Forging: Lightweight, high-strength design for max performance
• Gun-drilled mains and lightened journals cut weight
• Heat-treated and nitrided for durability
• Micro-polished journals reduce friction

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Reference Information

CRANKSHAFT-CHEVY LT1 4.000

Manley Pro Series crankshafts can make your short block bulletproof. They feature forged 4340 construction and undergo a multi-step heat-treatment process and are then nitrided for added strength. The crankshafts are stress-relieved, shot-peened, and magnafluxed. Manley Pro Series crankshafts have micro-polished large .125 in. radius journals, gun-drilled mains, and lightened rod journals for weight reduction. The counterweights are fully profiled and they are designed for internal balancing.