JE PISTONS 324858 Set Balanced Gm Motor 4.005 602

( Brand: Je Pistons ), ( Manufacturer Part Number: 324858 ), ( Part Type: Motor ), ( Material: Aluminum Alloy ), ( Country Of Origin: United States ), ( Performance Part: Yes )

Review JE PISTONS Set Of Eight Balanced 4.005 Bore Gm 602 Crate Motor

The **Je Pistons 324858 Balanced Set for 602 Motor (4.005g)** represents a meticulously engineered solution for enthusiasts and racers seeking precision, reliability, and performance in their high-revving 602cc two-stroke engines. Designed specifically for applications where weight distribution and balance are critical such as dirt bikes, go-karts, or off-road motorcycles this piston set delivers an optimized balance of strength and efficiency. Each piston in this set is forged from high-grade aluminum alloy, ensuring durability under extreme stress while maintaining a lightweight profile that enhances acceleration and responsiveness. The 4.005-gram weight per piston is carefully calibrated to minimize rotational inertia, reducing friction and allowing the engine to rev more freely without compromising structural integrity. The balanced design not only improves throttle response but also extends the lifespan of the crankshaft and connecting rods by reducing harmful vibrations. Whether used in a stock or heavily modified 602 motor, this piston set is engineered to handle high RPMs with confidence, making it an ideal choice for both street and track applications. Built to meet the demands of performance-oriented riders, the 324858 set combines precision machining with performance-focused engineering, ensuring that every stroke of the engine is both powerful and smooth.

**Pros and Cons of buying a JE Pistons 324858 Set (Balanced for 4.005" x 602 Motor)**

1. **Precision Balancing:** The pistons are factory-balanced for a 4.005" bore and a 602 motor, which reduces vibration and improves engine smoothness. Proper balancing is critical for longevity and performance, especially in high-RPM applications.

2. **High-Quality Materials:** JE Pistons are known for using forged aluminum alloys, which offer better strength, durability, and heat resistance compared to cast pistons. This reduces the risk of warping or failure under heavy loads.

3. **Optimized for Performance:** The pistons are designed to work well with high-compression engines, making them suitable for forced induction (turbo/supercharged) setups or high-performance naturally aspirated applications.

4. **Warranty and Support:** JE Pistons typically come with a manufacturer s warranty, providing some assurance against defects in materials or workmanship.

5. **Compatibility:** Since they are specifically balanced for a 4.005" bore and a 602 motor, they should fit seamlessly with other components in your engine build, reducing the risk of assembly errors.

6. **Durability:** Forged pistons generally last longer than cast ones, especially in demanding conditions, which can save money in the long run by avoiding frequent replacements.

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1. **Cost:** Forged pistons are more expensive than cast alternatives. While they offer better performance and longevity, the upfront cost may be prohibitive for budget-conscious builds.

2. **Specialized Fitment:** These pistons are tailored for a specific bore size (4.005") and motor (602). If your engine has slight variations or if you plan to modify the bore in the future, compatibility may become an issue.

3. **Installation Complexity:** Forged pistons often require careful handling during installation to avoid damage. Improper assembly (e.g., incorrect ring gaps, improper torque) can void warranties or lead to premature failure.

4. **Weight Considerations:** While balanced, forged pistons are heavier than cast pistons. In high-revving engines, this added weight can contribute to increased inertia, potentially affecting drivability or longevity of other components like crankshafts or bearings.

5. **Limited Aftermarket Support:** If you encounter issues, finding specialized repair or replacement parts for JE pistons may be more difficult compared to more common piston brands.

6. **Potential for Overkill:** If your engine is not heavily modified or stressed (e.g., a stock or mildly tuned engine), the benefits of forged pistons may not be fully realized, making them an unnecessary expense.

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The **JE Pistons 324858 set** is an excellent choice for high-performance or heavily modified engines, particularly those running at high RPMs, with forced induction, or under extreme loads. Their precision balancing, durability, and compatibility with a 4.005" bore and 602 motor make them a reliable upgrade for serious builders. However, the higher cost and specialized nature may not justify the investment for casual or stock applications where cast pistons would suffice.

- **Buy if:** You are building a high-performance engine (e.g., turbocharged, supercharged, or heavily modified), prioritize longevity and smooth operation, and can afford the premium price. Ensure the pistons match your bore size and motor specifications exactly.

- **Avoid if:** You are working on a stock or mildly tuned engine, operating on a tight budget, or plan to modify the bore significantly in the future. In such cases, a high-quality cast piston set may offer better value without sacrificing performance.

- **Consider alternatives:** If cost is a concern, explore other forged piston brands (e.g., JE s lower-tier options, Mahle, or Wiseco) or high-end cast pistons (e.g., JE s cast line) that balance performance and affordability. Always verify compatibility with your specific engine build.

Details:

Do not mix pins set is balanced. Bore 1.560 in. Does not include rings. Second Compression Ring Thickness.

Oil Ring Thickness. Were used in press fit application using factory GM 602 rods. SRP Pro 4032 Chevrolet Small Block Piston Kit 4.005 in. JE Pistons set of eight balanced for 4.005 bore made GM 602 crate motor but can be used in other applications.

part #: 324858 price

• $862.92

specifications pistonringro:

• brand: Je Pistons
• mpn: 324858
• part type: Motor
• material: Aluminum Alloy
• country of origin: United States
• performance part: Yes

seller pistonringro:

• city: Schertz, Texas
• # reviews: 1301
• rating: 100.0%

payments pistonringro:

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

offer pistonringro:

• sold: 0
• started: February 18, 2026
• best offers: True
• options: Ship-to-home
• availability: In Stock
• quantity: 1

general pistonringro:

• Car Truck Parts Accessories > Engines Engine Parts > Pistons Rings
• condition: Used

returns pistonringro:

• policy: No Returns

shipping pistonringro:

• type: Calculated
• carrier: UPS
• class: Standard
• cost: $20.32
• service: UPS Ground
• transit: 3-9 Days

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