GENUINE GM CRANKSHAFT 302-DZ-PISTONS Forged Balanced Blocks 370HP-LT1 Rotating Too Dz

( Brand: Genuine Gm Crankshaft ), ( Manufacturer Part Number: 302-DZ-PISTONS ), ( Part Type: Block ), ( Ipn: 370hp Lt1 ), ( Oe/oem Part Number: 3927173 ), ( Country Of Origin: United States )

Review GENUINE GM CRANKSHAFT 370hp Forged Balanced Rotating Assemblies Have Short Blocks Too Dz fits LT1 302 327 350

The **GM Crankshaft (370HP LT1, 302, 327, 350) Forged & Balanced Rotating Assembly** is a premium, high-performance component designed to elevate the durability, power output, and reliability of classic Chevrolet small-block engines, including the iconic LT1, 302, 327, and 350 configurations. Crafted from **high-strength forged steel**, this crankshaft is engineered to withstand extreme stress, high RPM demands, and aggressive camshaft profiles, making it an ideal choice for both street-driven muscle cars and high-performance drag applications. The **precision-machined main and rod journals** feature a **ground finish**, ensuring smooth operation and minimizing friction, while the **fully balanced rotating assembly** comprising the crankshaft, counterweights, and main bearings eliminates harmful vibrations, enhancing engine longevity and drivability. Whether you're building a **high-revving 370HP LT1 supercharged engine**, a **high-torque 350 big-block setup**, or a **high-performance 302/327 small-block**, this crankshaft delivers the structural integrity and rotational smoothness required to push power limits without compromising reliability. The **interchangeable fitment** across multiple displacement engines ensures versatility, while the **forged construction** provides superior strength compared to cast counterparts, making it a trusted upgrade for serious builders and restorers seeking to maximize performance while maintaining durability. Perfect for applications where power and precision are paramount, this rotating assembly is a cornerstone for engines demanding both strength and responsiveness.

Buying a **GM LT1 302/327/350 forged crankshaft, balanced rotating assembly, and DZ (Dry Sump) kit** particularly for high-performance applications has significant advantages but also notable drawbacks. Below is a detailed breakdown of the pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **High-Strength Forged Crankshaft**

- A forged crankshaft is significantly stronger than a cast crank, reducing the risk of catastrophic failure under extreme stress (e.g., forced induction, high RPM, or aggressive tuning).

- Forged cranks handle torque spikes better, making them ideal for turbocharged or supercharged applications where stress concentrations are higher.

- They often have better fatigue resistance, extending engine life under heavy loads.

2. **Balanced Rotating Assembly**

- A professionally balanced rotating assembly (crank, rods, pistons, and flywheel) reduces vibration, which improves drivability, longevity, and reduces wear on bearings and seals.

- Critical for high-RPM applications (e.g., drag racing, street tuning, or forced induction) where unbalanced components can cause excessive stress on the engine block and mounts.

- Helps prevent premature failure of crankshaft seals, rod bearings, and main bearings.

3. **Dry Sump (DZ) Oil System**

- A dry sump system separates the oil reservoir from the engine block, allowing for a larger oil capacity and better oil flow, especially in high-stress applications.

- Reduces oil starvation under extreme G-forces (e.g., high-angle driving, aggressive cornering, or forced induction).

- Enables the use of larger oil pumps and more efficient oil cooling, improving lubrication in high-performance scenarios.

- Useful for engines running at high RPM or under heavy loads for extended periods.

4. **Compatibility with GM LT1 Engines**

- The LT1 (302/327/350) is a proven, durable platform with a strong aftermarket support system, including performance parts, tuning options, and rebuild services.

- Forged cranks and balanced assemblies are widely available from reputable manufacturers (e.g., JE, Scat, Crane, or Forged Racing), ensuring quality and compatibility.

- The LT1 s architecture (e.g., pushrod design, overhead valves) allows for easy modifications, including big valves, high-flow heads, and forced induction.

5. **Longevity and Reliability**

- When properly maintained, an LT1 with a forged crank and balanced assembly can last well beyond 200,000 miles, especially in performance applications.

- Reduces the risk of sudden failure, which is critical for high-performance or competition use.

6. **Resale Value and Enthusiast Appeal**

- A well-built LT1 with performance upgrades (especially forged internals) holds value in the tuning and racing community.

- Attracts buyers looking for a reliable, high-performance street or track engine.

---

### **Cons**

1. **High Upfront Cost**

- Forged cranks, balanced assemblies, and dry sump kits are significantly more expensive than stock or cast alternatives.

- A complete build (crank, rods, pistons, balanced assembly, DZ kit, and associated labor) can easily cost **$5,000 $15,000 **, depending on the level of performance and quality of parts.

- The cost may not be justified for casual drivers or low-mileage, low-stress applications.

2. **Complex Installation and Maintenance**

- Installing a dry sump system requires additional plumbing (oil lines, pumps, filters, and reservoirs), which adds complexity to the build.

- Balanced assemblies must be installed correctly to avoid vibration issues; improper installation can lead to premature wear or failure.

- Forced induction or aggressive tuning may require additional supporting modifications (e.g., upgraded fuel system, cooling, or exhaust), increasing costs further.

3. **Weight and Space Considerations**

- A dry sump system adds weight (due to the oil reservoir and additional components) and requires space for oil lines and components.

- May not be feasible in tight engine bays, especially in older or modified vehicles with limited clearance.

4. **Potential Overkill for Mild Applications**

- If the engine is only used for light street driving or mild tuning (e.g., mild turbo or supercharger without aggressive boost), the benefits of a forged crank and DZ kit may not be necessary.

- Stock or cast cranks with a wet sump system may suffice for these applications, saving significant cost without sacrificing reliability.

5. **Maintenance Requirements**

- A high-performance engine with a dry sump system requires more frequent oil changes and monitoring (e.g., oil pressure, temperature, and filter maintenance).

- Forced induction or high-RPM applications may also require more frequent inspections of critical components (e.g., rods, bearings, and seals).

6. **Risk of Voiding Warranties or Insurance**

- Some manufacturers or insurance providers may void warranties or require additional coverage for high-performance modifications.

- Check with your insurer before making extensive changes, as performance engines may incur higher premiums or require special policies.

7. **Skill and Expertise Required**

- Installing and maintaining a high-performance engine with a dry sump system requires mechanical skill and experience.

- Mistakes in assembly, balancing, or oil system setup can lead to catastrophic failure, so professional installation is highly recommended.

---

### **Conclusion**

A **GM LT1 302/327/350 engine with a forged crankshaft, balanced rotating assembly, and dry sump kit** is an excellent choice for **high-performance applications**, including forced induction, racing, or aggressive street tuning. The strength, reliability, and reduced vibration of these components make them ideal for engines pushing significant power or RPM. However, the high cost, complexity, and maintenance demands may not be justified for casual drivers or mild modifications.

- **Intended use** (street, track, competition, or daily driving).

- **Budget** (are you willing to invest in premium components?).

- **Experience level** (can you or your mechanic handle the installation and maintenance?).

- **Long-term goals** (do you plan to push the engine hard, or is this a one-time upgrade?).

If you re building a **high-performance, long-lasting engine** for serious tuning or racing, the investment is well worth it. If you re looking for a **reliable but budget-friendly** upgrade, a stock or cast crank with a wet sump system may suffice.

---

### **Recommendation**

Proceed with the forged crank, balanced assembly, and dry sump kit. Pair it with supporting upgrades (e.g., high-flow heads, upgraded fuel system, and cooling) for optimal results. Ensure professional installation to avoid issues.

Consider a **cast crank with a balanced assembly** (if available) and a **wet sump system** to save costs while still improving reliability. A forged crank may not be necessary unless you plan to push the engine aggressively.

Stick with a **stock or aftermarket cast crank** (e.g., Scat or JE cast cranks) and a **wet sump system**, but monitor oil pressure and vibration closely. Avoid forced induction unless you re prepared for additional upgrades.

Invest in the **full package (forged crank, balanced assembly, DZ kit, and supporting mods)** if you want an engine that will handle extreme power and RPM without failure. Just be prepared for higher upfront costs and maintenance.

Ultimately, the LT1 is a fantastic platform, and these upgrades will significantly enhance its performance and durability **if the application demands it**.

Details:

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

Inquire about type and piston size before purchasing.

specifications cranshafengin:

• for models: Lt1, 302, 327, 350
• brand: Genuine Gm Crankshaft
• mpn: 302-dz-pistons
• part type: Block
• ipn: 370hp Lt1
• oe/oem part number: 3927173
• country of origin: United States

seller cranshafengin:

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

returns cranshafengin:

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

shipping cranshafengin:

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

general cranshafengin:

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

payments cranshafengin:

• wallet: Paypal
• other
• credit card: Discover

offer cranshafengin:

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

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