1. Engine Crankshafts Products
  2. sku: 18061659265189791
  3. MOLNAR 346-4000LB6F-58

MOLNAR TECHNOLOGIES 346-4000LB6F-58 Forged Crankshaft Gm Iv 4.000 Iii/iv Ls 58X

346-4000lb6f-58 Molnar Technologies 4.000 Stroke Forged Crankshaft For Gm Gen Iii/iv Ls 58x

( Brand: Molnar Technologies ), ( Manufacturer Part Number: 346-4000LB6F-58 ), ( Part Type: Crankshaft ), ( Air Restricted: No ), ( Performance Part: Yes )

Review MOLNAR TECHNOLOGIES 4.000 Stroke Forged Crankshaft Gm Gen Iii/iv Ls 58x

Molnar 346-4000lb6F-58 Forged Crankshaft for GM Gen III/IV LS 5.8L Engines

The Molnar 346-4000lb6F-58 Forged Crankshaft is an exceptional upgrade for your General Motors Gen III/IV LS 5.8L engine. This high-performance crankshaft is meticulously crafted to deliver unparalleled strength, durability, and reliability, making it an ideal choice for high-horsepower applications.

The crankshaft is forged from premium aviation-grade 4340 steel, ensuring it can withstand extreme loads and stresses. Its 6-bolt main cap design and 58x journal size provide enhanced strength and increased load capacity, rated at a staggering 4000 lbs.

The Molnar 346-4000lb6F-58 Crankshaft features a polished finish that not only enhances its aesthetic appeal but also reduces friction, contributing to smoother engine operation. The crankshaft is also precision balanced to minimize vibrations and ensure a quiet, comfortable driving experience.

This forged crankshaft is a direct fit for GM Gen III/IV LS 5.8L engines, ensuring easy installation. It is designed to replace the stock crankshaft, offering a significant upgrade in performance and durability. The Molnar 346-4000lb6F-58 Forged Crankshaft is perfect for performance enthusiasts seeking to extract maximum power from their LS engine while maintaining the highest levels of reliability and safety.

In summary, the Molnar 346-4000lb6F-58 Forged Crankshaft is a top-tier upgrade for your GM Gen III/IV LS 5.8L engine. Its superior strength, precision engineering, and balanced design make it an essential component for high-horsepower applications, ensuring unmatched performance and reliability.

A Detailed Analysis of the Molnar 346-4000lb6f-58 4.000 Forged Crankshaft for GM Gen III/IV LS 58x

Pros:

1. **Forged Construction**: This crankshaft is forged, which means it is made from a solid billet of material. This process results in a more durable and stronger crankshaft compared to cast crankshafts.

2. **Load Capacity**: The Molnar 346-4000lb6f-58 4.000 crankshaft has a load capacity of up to 4000 lbs, making it suitable for high horsepower applications.

3. **Fitment**: This crankshaft is designed specifically for GM Gen III/IV LS 58x engines, ensuring a precise fit.

4. **Balanced**: The crankshaft is balanced to reduce vibrations and improve engine performance.

Cons:

1. **Cost**: Forged crankshafts tend to be more expensive than their cast counterparts, and this crankshaft is no exception.

2. **Installation Complexity**: Installing a forged crankshaft can be more complex and time-consuming than a cast crankshaft due to the need for precision and the potential for damage during the installation process.

3. **Not Suitable for Stock Engines**: This crankshaft is designed for high horsepower applications, so installing it in a stock engine may not provide any noticeable benefits and could potentially cause issues.

Conclusion:

The Molnar 346-4000lb6f-58 4.000 forged crankshaft offers increased load capacity, durability, and precision fitting for GM Gen III/IV LS 58x engines. However, its high cost, potential complexity during installation, and suitability only for high horsepower applications should be carefully considered. If you are planning a high-performance build for your GM Gen III/IV LS engine, this crankshaft could be a valuable investment. However, for stock or lightly modified engines, it may be overkill and potentially cause issues.

Recommendation:

If you are planning a high-performance build for your GM Gen III/IV LS engine and have the budget for it, the Molnar 346-4000lb6f-58 4.000 forged crankshaft could be a great choice. However, if you have a stock or lightly modified engine, it might be beneficial to consider less expensive options or wait until you are ready for a high-performance build before investing in a forged crankshaft. Always consult with a professional mechanic or engine builder when making decisions about engine components.

Details:

Molnar Crankshaft, Chevy LS, 4.000 Stroke, 2.559 Main, 2.100 Rod Journal, 6.125 or Longer Rod, Internal Balance, Bob Weight 1800. Balance Type: Internal, Crankshaft Stroke: 4.0 Series: Standard Weight, Material: 4340 Steel. Molnar 4.000 Stroke Forged Crankshaft for GM Gen III/IV LS 58X.

part #: 3464000lb6f58 prices

  • $1280.56-$1345.20

specifications cranshafengin:

  • brand: Molnar Technologies
  • mpn: 346-4000lb6f-58
  • part type: Crankshaft
  • air restricted: No
  • performance part: Yes

shipping cranshafengin:

  • transit: 3-7 Days
  • type: Calculated
  • carrier: UPS
  • cost: $0.00
  • service: UPS Ground
  • class: Standard

general cranshafengin:

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

seller cranshafengin:

  • city: Bossier City, Louisiana
  • rating: 99.9%
  • # reviews: 59767

returns cranshafengin:

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

offer cranshafengin:

  • quantity: 4
  • availability: In Stock
  • started: December 27, 2025
  • sold: 0
  • options: Ship-to-home

payments cranshafengin:

  • wallet: Apple-pay
  • other
  • credit card: Discover
part type: crankshaft, air restricted: no, performance part: yes,
category: auto parts > car truck parts accessories > engines engine parts > crankshafts, sku: 18061659265189791,
Molnar Technologies 346-4000LB6F-58 Is Similar To:
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3 offers $1280.56–$1345.20 USD
  • New. Offer #1 priced at $1345.20 + $0.00 shipping estimate = $1345.20* total. Molnar Crankshaft, Chevy LS, 4.000 Stroke, 2.559 Main, 2.100 Rod Journal, 6.125 or Longer Rod, Internal Balance, Bob Weight 1800 Balance Type Internal Crankshaft Stroke 4.000 Crankshaft Series Standard Weight Crankshaft Material 4340 Steel.FREE SHIPPING
  • New. Offer #2 priced at $1342.03 + $0.00 shipping estimate = $1342.03* total. Stroke (in): 4.000 in. Crankshaft - 4.000 in Stroke - Internal Balance - 58X Reluctor Wheel - Forged Steel - 1-Piece Seal - GM LS-Series - Each.FREE SHIPPING
  • New. Offer #3 priced at $1280.56 + $0.00 shipping estimate = $1280.56* total. Manufacturer: Molnar Technologies.FREE SHIPPING

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