GENUINE GM CRANKSHAFT LS6-454-CRANKSHAFT Forged Balanced Too 793348110103 Rotating Blocks L78

( Brand: Genuine Gm Crankshaft ), ( Manufacturer Part Number: LS6-454-CRANKSHAFT ), ( Part Type: Block ), ( Oe/oem Part Number: 427 Forged Crankshaft ), ( Country Of Origin: United States ), ( UPC: 793348110103 )

Review GENUINE GM CRANKSHAFT Forged Balanced Rotating Assemblies Have Short Blocks Too L78 fits LS6 396 427 454

The **GM Crankshaft (Part Numbers: 793348110103, 396, 427, 454) Forged, Balanced, Rotating Assembly for LS6, L78 Engines** represents a premium, high-performance component designed for enthusiasts and professional mechanics seeking uncompromising durability and precision in their Chevrolet small-block V8 applications. Crafted from **high-grade forged steel**, this crankshaft is engineered to withstand extreme stress, high RPM demands, and the relentless forces generated by supercharged, turbocharged, or naturally aspirated high-performance engines. The **balanced rotating assembly** ensures smooth operation, minimizing vibration and prolonging the lifespan of supporting components like bearings, rods, and the engine block itself. This crankshaft is meticulously machined to exacting tolerances, featuring **counterweights strategically positioned** to optimize rotational stability, making it an ideal choice for engines like the legendary **LS6 (L99) and L78 (L78 Super Bowl)**, which are renowned for their aggressive power outputs and racing pedigree.

The **396, 427, and 454-inch stroke variants** cater to a wide range of displacement needs, allowing builders to fine-tune their engine s powerband, torque characteristics, and overall performance profile. Whether you're restoring a classic muscle car, building a modern high-RPM monster, or preparing a street/strip hybrid, this crankshaft delivers the structural integrity and performance potential required to push boundaries. Its **rotating assembly** includes a **main journal and rod journal configuration** optimized for high-speed reliability, with **polished surfaces** to reduce friction and heat buildup, ensuring longevity even under extreme conditions. Additionally, the crankshaft s **forged construction** provides superior resistance to fatigue and distortion compared to cast alternatives, making it a trusted choice for both OEM replacements and high-performance upgrades.

For those seeking the pinnacle of small-block V8 performance, this crankshaft is a **must-have component**, offering a seamless integration with aftermarket rods, pistons, and connecting rods while maintaining compatibility with stock or upgraded engine bay components. Its **precision engineering** and **race-proven durability** make it a favorite among drag racers, circle track competitors, and street rod builders alike. Whether you're targeting **high horsepower gains, improved reliability, or a blend of both**, this GM crankshaft delivers the foundation needed to transform your engine into a true powerhouse one that turns heads and dominates the track or the street.

### **Pros and Cons of Buying a GM Crankshaft (Part Number 793348110103 396/427/454 Forged, Balanced, Rotating Assembly for LS6/L78 Engines)**

1. **Forged Construction** Forged crankshafts are significantly stronger than cast counterparts, offering better resistance to fatigue, bending, and torsional stress. This makes them ideal for high-performance applications, including forced induction builds, heavy-duty towing, or high-RPM operation.

2. **Balanced and Polished** The crankshaft is pre-balanced and polished, reducing vibration and wear on engine components. This improves drivability, longevity, and overall engine smoothness, especially in high-performance applications.

3. **Rotating Assembly (RA) Package** The inclusion of a rotating assembly (crankshaft, counterweights, and main journals) ensures all components are matched and optimized for performance. This eliminates the need for additional balancing or machining, saving time and potential alignment issues.

4. **Compatibility with LS6/L78 Engines** This crankshaft is designed for GM s high-performance V8 engines (LS6, L78), which are known for their durability and power potential. It fits stock and aftermarket builds, including turbocharged or supercharged applications.

5. **Aftermarket and OEM Support** GM s forged crankshafts are widely used in both OEM and aftermarket contexts. They are backed by reputable manufacturers (such as GM Performance Parts, Edelbrock, or other trusted suppliers), ensuring availability of gaskets, seals, and related components.

6. **Durability for High-Stress Applications** The forged steel construction is better suited for extreme loads, such as heavy-duty towing, drag racing, or high-horsepower builds. It can withstand higher stresses without failing compared to cast cranks.

7. **Reduced Risk of Catastrophic Failure** Forged cranks are less prone to cracking or breaking under excessive stress, which is critical for engines running at high RPMs or under heavy loads.

8. **Easier Installation** Since the crankshaft is pre-balanced and often includes counterweights, installation is simpler than with raw or unbalanced cranks. This reduces the risk of engine vibration issues post-installation.

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1. **High Cost** Forged crankshafts are significantly more expensive than cast alternatives. Prices can range from **$1,500 to $3,000 **, depending on the supplier and whether it s a complete rotating assembly. This makes them a substantial investment, especially for stock or mild performance builds.

2. **Not Necessary for Stock or Mild Builds** If you re running a stock or lightly modified engine (e.g., stock LS6/L78 with minor upgrades), a forged crankshaft may be overkill. A stock or aftermarket cast crankshaft (properly balanced) could suffice, saving money without sacrificing reliability.

3. **Installation Complexity** While pre-balanced, installing a crankshaft still requires careful handling to avoid damaging seals, bearings, or the crank itself. Improper installation (e.g., cross-threading, improper torque) can lead to premature failure.

4. **Potential for Overengineering** Some builders may not fully utilize the crankshaft s capabilities, leading to wasted money. If the engine isn t being pushed to its limits (e.g., no forced induction, minimal power gains), the extra strength may not be justified.

5. **Limited Availability of Replacement Parts** While forged cranks are durable, if damage occurs (e.g., bent rod journals), replacement parts may be harder to source than for cast cranks. Some aftermarket suppliers may not carry forged crankshaft components.

6. **Weight Consideration** Forged cranks are heavier than cast counterparts, which can slightly increase rotating mass. While the difference is minimal, it may have a negligible impact on high-RPM performance in extreme builds.

7. **Potential for Misalignment Issues** If the engine block or bearings are worn, a new forged crankshaft may not perform optimally. Ensuring the block, main bearings, and rod bearings are in good condition is critical before installation.

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A **GM forged crankshaft (793348110103) is an excellent choice for high-performance, high-stress applications**, such as forced induction builds, heavy-duty towing, or extreme power modifications. Its superior strength, balance, and durability justify the cost in these scenarios. However, for **stock or mildly modified engines**, a forged crank may be unnecessary, leading to an unnecessary expense.

If you re planning to **push your engine beyond stock limits** (e.g., turbocharging, nitrous, or high-RPM operation), the forged crankshaft is a **strong recommendation**. For **stock or near-stock builds**, a **properly balanced cast crankshaft** (from a reputable supplier) may be sufficient and more cost-effective.

- You re building a **high-performance engine** (turbocharged, supercharged, or high-RPM).

- You re running **forced induction** or **extreme power levels** (e.g., 800 HP).

- You need **maximum durability** for towing, racing, or heavy-duty use.

- You re replacing a **worn or damaged crankshaft** in an existing high-stress engine.

- Your engine is **stock or lightly modified** (no forced induction).

- You re on a **tight budget** and can achieve similar reliability with a high-quality cast crankshaft.

- You re unsure whether the engine will ever reach the crankshaft s performance threshold.

For most **serious performance builds**, the **forged crankshaft is the best long-term investment** in engine reliability and power potential. However, always ensure the rest of the engine (block, bearings, rods, etc.) is in top condition before installation.

Details:

Inquire about type and piston size before purchasing. I also have 4 bolt blocks that are in great shape and could do short or complete engines. I am working toward retirement and selling off left over Crankshaft kits rotating assemblies. Price is for rotating assembly only.

Inquire for details.

specifications cranshafengin:

• for models: Ls6, 396, 427, 454
• brand: Genuine Gm Crankshaft
• mpn: Ls6-454-crankshaft
• part type: Block
• oe/oem part number: 427 Forged Crankshaft
• country of origin: United States
• upc: 793348110103

returns cranshafengin:

• time: 30 Days
• policy: Returns Accepted
• paid by: Seller

offer cranshafengin:

• availability: In Stock
• best offers: True
• quantity: 1
• started: May 15, 2026
• options: Ship-to-home
• sold: 0

seller cranshafengin:

• city: Angola, Indiana
• rating: 100.0%
• # reviews: 1738

general cranshafengin:

• Car Truck Parts Accessories > Engines Engine Parts > Crankshafts
• condition: Remanufactured

shipping cranshafengin:

• type: Fixed
• cost: $39.00
• service: Standard
• class: Standard
• transit: 4-11 Days

payments cranshafengin:

• credit card: Discover
• wallet: Google-pay
• other

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