1. Pistons, Rings, Rods & Parts Engines Components For Sale
  2. sku: 12618356048293752
  3. MAXPEEDINGRODS JNCSU4

MAXPEEDINGRODS JNCSU4 Steel Connecting Rods Bolts Conrod Kit

fits model: Tr3, Tr4. make: Triumph. year: 1961–1965.

Jncsu4 Maxpeedingrods Steel Connecting Rods Bolts Conrod With Kit For Triumph Tr3 Tr4 1961-1965

( Brand: Maxpeedingrods ), ( Manufacturer Part Number: JNCSU4 ), ( Part Type: Rod Bolt ), ( Big End Diameter: 56.72mm ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Center To Center Length: 158.75mm ), ( Fitment Type: Performance/custom ), ( Material: Forged 4340 Aircraft Chrome Moly Quality Steel ), ( Note: No Instruction Included ), ( Notice: This Is Aftermarket Replcement Part ), ( Pin Type: Bronzed Bushing Floating Pin ), ( Quantity: 1 Set Of 4 Pieces ), ( Small End Diameter: 22mm ), ( Warranty: 2 Year ), ( Weight Tolerance: Balanced To / 1 Gram In Set )

Review MAXPEEDINGRODS Steel Connecting Rods Bolts Conrod Kit Triumph fits TR3 TR4 1961–1965

The **Maxpeeding Rods JNC-SU4 Steel Connecting Rods Bolt Kit** is a meticulously engineered aftermarket upgrade designed specifically for the classic Triumph TR3 and TR4 models produced between 1961 and 1965. This high-performance kit replaces the stock aluminum connecting rods and bolts with a robust set of **forged 4340 steel rods**, ensuring superior strength, durability, and reliability under heavy loads and high RPM conditions. The rods are precision-machined to exacting tolerances, maintaining the original Triumph engine s bore spacing while delivering enhanced rigidity and resistance to fatigue, which is critical for engines modified with forced induction or aggressive camshafts. Each rod is paired with **high-strength, grade 8.8 or higher steel bolts**, featuring a **fine-threaded design** for optimal clamping force and a **locking mechanism** to prevent loosening under extreme vibrations. The kit also includes **newly machined rod bearings** that are compatible with the upgraded rods, ensuring a smooth, low-friction articulation while supporting the increased stress placed on the crankshaft and main bearings. Whether you're pushing the limits of your Triumph s stock displacement or preparing it for a more aggressive tune, this kit provides the structural integrity needed to handle the additional power without compromising reliability. Built to withstand the demands of modern performance driving while preserving the classic aesthetic of your engine bay, the Maxpeeding Rods JNC-SU4 kit is an essential component for enthusiasts seeking both performance gains and long-term durability in their beloved TR3 or TR4.

**Pros and Cons of buying a Maxpeedingrods JNC-SU4 Steel Connecting Rods Bolt and Conrod Kit for Triumph TR3/TR4 (1961 1965)**

### **Pros**

1. **High-Strength Steel Construction** The rods are made from forged steel, which provides superior strength and durability compared to stock cast-iron rods. This reduces the risk of catastrophic failure, especially under high-performance or modified engine conditions.

2. **Precision-Machined for Fitment** The kit is designed specifically for the Triumph TR3/TR4 engines from 1961 1965, ensuring proper alignment and clearance with the crankshaft and bearings. This minimizes the risk of interference or binding.

3. **Enhanced Performance Potential** Steel rods can better handle increased power outputs from modifications such as forced induction, high-compression cylinder heads, or aggressive camshafts. They are less prone to flexing under high loads, improving reliability.

4. **Compatibility with Aftermarket Parts** The kit is likely designed to work with common performance upgrades (e.g., SU carburetors, performance cams, or turbocharging), making it a versatile choice for enthusiasts looking to push their engines beyond stock limits.

5. **Reduced Weight (Compared to Cast Iron)** While not a significant weight difference, steel rods are lighter than cast-iron rods, which can slightly improve engine balance and reduce reciprocating mass.

6. **Warranty and Reputation** Maxpeedingrods is a well-regarded supplier of performance parts, often backed by warranties and positive feedback from the tuning community. This adds confidence in the product s quality and longevity.

7. **Easier Installation** The kit typically includes all necessary hardware (bolts, washers, etc.), simplifying the installation process compared to sourcing individual components separately.

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### **Cons**

1. **Cost** Steel connecting rod kits are significantly more expensive than stock or aftermarket cast-iron rods. For a classic car like the TR3/TR4, this can be a substantial investment, especially when balanced against the vehicle s overall value.

2. **Installation Complexity** Replacing connecting rods requires disassembly of the engine, including removal of the crankshaft, pistons, and cylinder head. This is a labor-intensive process that may require professional assistance, adding to the total cost.

3. **Potential for Overkill** If the engine is not heavily modified, the stock rods may still be adequate for daily driving or light performance use. Upgrading to steel rods may not offer noticeable benefits unless power outputs are significantly increased.

4. **Limited Availability of Spare Parts** While steel rods are durable, if a rod fails (though rare), sourcing a replacement may be more difficult than for common cast-iron rods. Always keep a spare set or ensure the supplier offers support.

5. **Compatibility with Stock Components** Some aftermarket steel rod kits may require additional modifications, such as upgraded crankshaft bearings or main bearings, to ensure optimal performance. This adds to the overall cost and complexity.

6. **Resale Impact** Classic cars like the TR3/TR4 are often valued for their originality. Installing performance parts, especially high-end steel rods, may reduce resale appeal to purists or collectors who prioritize stock or period-correct modifications.

7. **Learning Curve for DIY Installation** If the installer lacks experience with engine rebuilds, the process can be daunting. Mistakes during installation (e.g., incorrect torque, misalignment) can lead to catastrophic engine failure.

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### **Conclusion**

The **Maxpeedingrods JNC-SU4 steel connecting rod kit** is an excellent choice for Triumph TR3/TR4 owners who are pursuing **high-performance modifications**, such as forced induction, aggressive camshafts, or significant power increases. The kit s strength, precision, and compatibility with aftermarket parts make it a reliable upgrade for enthusiasts willing to invest in long-term reliability. However, for owners who prioritize **originality, budget constraints, or minimal modifications**, the cost and complexity may outweigh the benefits.

The decision to install this kit should be based on:

- **Engine goals** (e.g., street performance vs. track use).

- **Budget** (weighing the cost against other potential upgrades).

- **Experience level** (whether DIY installation is feasible or professional help is needed).

- **Long-term plans** (whether the car will remain stock or be heavily modified).

If the engine is being prepared for **serious power gains** and the owner is committed to the project, the steel rod kit is a worthwhile investment. For casual enthusiasts or those keeping the car closer to stock, the benefits may not justify the expense.

### **Recommendation**

- **For performance-focused builds:** Proceed with the Maxpeedingrods kit, especially if pairing it with other upgrades like a performance cam, SU carburetors, or forced induction. Pair it with high-quality bearings and follow torque specifications strictly.

- **For stock or lightly modified engines:** Consider alternative upgrades (e.g., performance pistons, upgraded crankshaft bearings) that offer better value without the complexity of rod replacement.

- **For classic car preservation:** Evaluate whether the rods are necessary or if the car s value lies in its originality. If resale is a concern, opt for a more subtle performance upgrade.

Ultimately, this kit is best suited for those who are **serious about pushing their TR3/TR4 s limits** and have the technical know-how or resources to install it correctly. Always consult with a trusted mechanic or performance specialist before committing to such a significant modification.

Details:

Best Costumer Service. All big and small ends are finished with SUNNEN honing machine, Precision alignment sleeves positively locate the rod cap, maintaining end bore size eliminating cap walk, -100% X-rated, sonic tested , -Multi-stage heat treated, Shot preened to relieve stress, Come bronzed bushing suitable for floating piston pin. Factory Warranty. All messages.

Guaranteed Fitment Always the correct part. V PRODUCT TEST AND ISO 9001 CERTIFIED, Type: Forged 4340 aircraft chrome moly quality steel for racing, H-beam Conrod Quantity: 4 Pieces a set, Bolts:Including ARP 2000 bolts, Note: Extra cost upgrading to L19 Bolts Size: 3/8 Tolerance: Balanced /- 1 gram in Piston Bolt Hole: -4/1000mm, Power: 600hp 800PS per Strength of the fastening PSI: 220,000/230,000 PSI Torque: 48ft 65 NM, Top acceleration: 9000rpm, warranty: Year warranty any manufacturing defect. Suspension Masters US. To length : 158.75mm, Big end diameter: 56.72mm, Small 22.22mm, width : 29.85mm, 26.92mm.

For Triumph TR3 TR4.

specifications pistonrinro:

  • for models: Tr3, Tr4
  • for makes: Triumph
  • for years: 1961-1965
  • brand: Maxpeedingrods
  • mpn: Jncsu4
  • part type: Rod Bolt
  • big end diameter: 56.72mm
  • california prop 65 warning: California Prop 65 Warning
  • center to center length: 158.75mm
  • fitment type: Performance/custom
  • material: Forged 4340 Aircraft Chrome Moly Quality Steel
  • note: No Instruction Included
  • notice: This Is Aftermarket Replcement Part
  • pin type: Bronzed Bushing Floating Pin
  • quantity: 1 Set Of 4 Pieces
  • small end diameter: 22mm
  • warranty: 2 Year
  • weight tolerance: Balanced To / 1 Gram In Set

returns pistonrinro:

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

general pistonrinro:

  • Car Truck Parts Accessories > Engines Engine Parts > Connecting Rods Parts
  • condition: New

seller pistonrinro:

  • rating: 99.5%
  • # reviews: 12925
  • city: Houston, Texas

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offer pistonrinro:

  • options: Ship-to-home
  • started: March 5, 2026
  • quantity: 4
  • availability: In Stock
  • sold: 0
  • best offers: True

shipping pistonrinro:

  • cost: $0.00
  • carrier: FedEx
  • service: FedEx Ground / FedEx Home Delivery
  • type: Fixed
  • class: Standard
  • transit: 4-8 Days
for models: tr3, tr4, for makes: triumph, for years: 1961-1965, part type: rod bolt, big end diameter: 56.72mm, california prop 65 warning: california prop 65 warning, center to center length: 158.75mm, fitment type: performance/custom, note: no instruction included, notice: this is aftermarket replcement part, pin type: bronzed bushing floating pin, quantity: 1 set of 4 pieces, small end diameter: 22mm, warranty: 2 year, weight tolerance: balanced to / 1 gram in set,
category: auto parts > car truck parts accessories > engines engine parts > connecting rods parts, material: forged 4340 aircraft chrome moly quality steel, sku: 12618356048293752,
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