MAXPEEDINGRODS G4SIFB Forged Steel Beam Conrods Spitfire 4340 EN24 4X

( Brand: Maxpeedingrods ), ( Manufacturer Part Number: G4SIFB ), ( Big End Diameter: 51.34mm ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Center To Center Length: 146.05mm ), ( Country Of Origin: China ), ( 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: 4 Pieces Of H-beam Connecting Rods ), ( Small End Diameter: 20.63mm ), ( Weight Tolerance: Balanced To / 1 Gram In Set )

Review MAXPEEDINGRODS 4340 Forged Steel H beam Conrods 4x Triumph Spitfire Late fits 1500 1300

The **Maxpeeding Rods G4SIFB 4340 EN24 Forged Steel H-Beam Connecting Rods (4x)** represent the pinnacle of high-performance engineering for the iconic Triumph Spitfire 1500 and 1300 models, meticulously crafted to elevate both power delivery and reliability. These rods are not merely an upgrade they are a precision-forged solution designed to withstand the extreme stresses of aggressive driving, track use, or high-revving modifications without compromising structural integrity. Engineered from **4340 alloy steel**, a material renowned for its exceptional strength-to-weight ratio and fatigue resistance, these rods undergo a rigorous **EN24 heat-treatment process**, ensuring a uniform hardness of 38 42 HRC across the entire assembly. This meticulous forging and tempering protocol eliminates internal stresses, reducing the risk of catastrophic failure even under the most demanding conditions.

The **H-beam design** is a standout feature, offering superior torsional rigidity compared to traditional I-beam rods. This geometry distributes engine forces more evenly, minimizing rod deflection and enhancing overall durability while allowing for a more aggressive camshaft profile or increased compression ratios. Each rod is **fully machined from solid billet**, with critical components such as the caps, journals, and big-end bolts forged as a single unit before being precision-machined to exacting tolerances. The **split-pin retained big-end caps** feature a **12-point bolt pattern**, ensuring a secure and repeatable clamping force that prevents slop and maximizes power transfer. The **ground and polished rod journals** glide effortlessly within the bearings, reducing friction and wear, while the **counterbored small-end holes** accommodate modern, high-performance pistons without interference.

Beyond their mechanical superiority, these rods are engineered with **installation convenience** in mind. The **pre-drilled and tapped rod caps** allow for easy alignment with the crankshaft, while the **pre-marked rod numbers** simplify assembly, ensuring correct pairing with the crankshaft and pistons. The **chrome-moly steel bolts** included with the kit are heat-treated to match the rods strength, providing a robust clamping solution that resists stretch and deformation over time. Whether you re pushing the Spitfire s twin-cam engine to its limits on the track, chasing top-end horsepower with a forced induction setup, or simply seeking a future-proof upgrade for longevity, these **Maxpeeding Rods** deliver a blend of cutting-edge design and uncompromising craftsmanship. Built to last, they transform your Spitfire into a more responsive, durable, and exhilarating machine proving that true performance begins with the foundation beneath the piston.

### **Pros and Cons of Buying Maxpeedingrods G4SIFB 4340 EN24 Forged Steel H-Beam Connecting Rods for Triumph Spitfire 1500/1300**

1. **Superior Strength and Durability** These rods are made from **4340 steel**, a high-grade alloy known for its strength, toughness, and resistance to fatigue. The **EN24 forged construction** ensures a dense, uniform grain structure, reducing the risk of failure under high stress, which is critical for forced induction or high-performance applications.

2. **H-Beam Design** The **H-beam cross-section** provides exceptional stiffness and torsional rigidity compared to traditional I-beam rods. This design helps minimize rod deflection under heavy loads, improving reliability and reducing the risk of catastrophic failure, especially in high-revving engines like the Spitfire s.

3. **Precision Machining** Maxpeedingrods is known for **high-precision manufacturing**, ensuring tight tolerances and a perfect fit with the Spitfire s crankshaft and bearings. This reduces stress concentrations and improves overall engine efficiency.

4. **Lightweight Yet Strong** While forged steel rods are heavier than some aftermarket options (e.g., billet aluminum), the **4340 EN24 alloy** strikes a balance between strength and weight reduction compared to standard rods, improving power-to-weight ratios without sacrificing durability.

5. **Compatibility with Forced Induction** If you plan to add **turbocharging or supercharging** to your Spitfire, these rods are a **critical upgrade**. Their strength allows for higher boost levels and increased power without the risk of rod failure, which is a common issue with stock rods under heavy loads.

6. **Long-Term Reliability** Forged steel rods are less prone to **cracking or bending** under extreme stress compared to cast or billet rods, making them ideal for **high-mileage or aggressive driving** scenarios. This is particularly important for classic engines where reliability is paramount.

7. **Aftermarket Support and Tuning Potential** Maxpeedingrods rods are designed to work well with **high-performance camshafts, pistons, and crankshafts**, allowing for **better tuning flexibility** if you plan to modify other engine components.

8. **Warranty and Reputation** Maxpeedingrods is a well-regarded brand in the aftermarket performance sector, offering **strong warranties** and a reputation for quality. This provides peace of mind compared to lesser-known manufacturers.

---

1. **Cost** These rods are **significantly more expensive** than stock or basic aftermarket options. A set of four **G4SIFB rods** will likely cost **several hundred dollars**, making them a substantial investment compared to OEM or budget upgrades.

2. **Installation Complexity** Replacing connecting rods requires **specialized tools, expertise, and disassembly of the engine**. If you re not experienced with engine work, you may need to **hire a mechanic**, adding to the cost. Improper installation can void warranties or lead to damage.

3. **Weight Increase** While not as heavy as cast rods, **4340 forged steel is denser than aluminum or some billet steel options**. This slight weight increase may have a **minor impact on high-RPM performance**, though the strength benefits usually outweigh this in most cases.

4. **Limited Stock Availability** As high-performance parts, these rods may not be **instantly available** and could require **special ordering**, potentially delaying your project.

5. **Potential Overkill for Stock Applications** If you re running a **stock or mildly modified Spitfire** with **no forced induction or aggressive tuning**, these rods may be **more than necessary**. Stock rods can handle stock power levels without issue, and the extra cost may not be justified unless you plan future modifications.

6. **Maintenance Requirements** Forged steel rods, while durable, still require **proper lubrication and maintenance**. Neglecting oil changes or using low-quality oil could **reduce their lifespan**, though this applies to any high-performance rod.

7. **Compatibility with Other Components** If your engine has **weak or mismatched components** (e.g., stock crankshaft, bearings, or pistons), upgrading only the rods may **not fully optimize performance**. A full engine build (including crank, bearings, and pistons) may be needed for maximum benefit.

---

The **Maxpeedingrods G4SIFB 4340 EN24 forged steel H-beam rods** are one of the **best aftermarket options** for a Triumph Spitfire 1500/1300, especially if you plan **forced induction, high RPM use, or aggressive tuning**. Their **superior strength, stiffness, and reliability** make them an excellent choice for those pushing the engine beyond stock limits. However, the **high cost, installation complexity, and potential overkill for stock applications** mean they are **not essential for casual drivers**.

If you re **serious about performance, turbocharging, or long-term reliability**, these rods are a **strong recommendation**. If you re running a **stock or lightly modified engine**, they may not be necessary unless you anticipate future modifications.

- **Buy if:** You plan to **add forced induction, run high boost, or modify the engine significantly**. You want **maximum reliability and strength** for high-performance applications.

- **Skip if:** You re running a **stock or mildly modified engine** and don t plan future power increases. You prefer **lower cost and simpler upgrades**.

- **Consider alternatives if:** You want **lighter rods** (e.g., billet steel or aluminum), though they may sacrifice some strength. Ensure any alternative meets **or exceeds** the strength requirements for your intended power levels.

For the **Spitfire s high-revving nature and potential for forced induction**, these rods are a **smart investment** if budget allows. Always pair them with **compatible crankshafts, bearings, and pistons** for optimal results.

Details:

To length : 146.05mm, Big end diameter: 51.34mm, Small 20.63mm, width : 22.8mm, 22.8mm. 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. V PRODUCT TEST AND ISO 9001 CERTIFIED, Type: Forged 4340 aircraft chrome moly quality steel for racing, H-beam Conrods Quantity: 4 Pieces a set, Bolts:Including ARP 2000 5/16 bolts, Note: Extra cost upgrading to L19 Bolts Size: 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: 7000rpm, warranty: Year warranty any manufacturing defect.

For Triumph Spitfire 15 Late 1300.

part #: g4sifb prices

• $250.00-$350.00

specifications pistonrinro:

• for models: 1500, 1300
• for makes: Triumph
• brand: Maxpeedingrods
• mpn: G4sifb
• big end diameter: 51.34mm
• california prop 65 warning: California Prop 65 Warning
• center to center length: 146.05mm
• country of origin: China
• 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: 4 Pieces Of H-beam Connecting Rods
• small end diameter: 20.63mm
• weight tolerance: Balanced To / 1 Gram In Set

offer pistonrinro:

• started: June 3, 2026
• sold: 0
• options: Ship-to-home
• availability: In Stock
• best offers: True
• quantity: 3

general pistonrinro:

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

shipping pistonrinro:

• cost: $0.00
• service: FedEx Ground / FedEx Home Delivery
• class: Standard
• transit: 3-7 Days
• carrier: FedEx
• type: Fixed

seller pistonrinro:

• # reviews: 3003
• city: Rowland height, California
• rating: 99.7%

returns pistonrinro:

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

payments pistonrinro:

• wallet: Paypal
• credit card: Discover
• other

Maxpeedingrods G4SIFB Is Similar To:

• Maxpeedingrods Rgo24q Titanizing Racing 4340 Connecting Rods For Toyota Auris E180 Nr 8nr-fts 1.2t (44.9% similar) 7TH, . All big and small ends are finished with sunken 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...(August 12th, 2023)
• Maxpeedingrods Sl8ozy 8 Pcs En24 4340 Forged Connecting Rods Arp 8740 Bolts For Chevrolet Small Block (47.2% similar) 215,000-220,000 psi. Shot-preened finish to remove potential for stress risers, 6.HIGH precision CBC machined,precision rod cap alignment dowels, 7.BORES finished /- .01MM, 8.BALANCED within 1PER rod, a weak rod bolt in a racing engine means catastrophic disaster and will put your life at risk. Each...(August 15th, 2023)
• Maxpeedingrods Qp7i3h 4x Titanize Connecting Rods En24 4240 For Volkswagen Audi 1.4 Tsi tfsi Ea211 (37.8% similar) For Volkswagen pasta RSI 3G5, 3G2, 3C5, 3C2, 365, 362 1.4. 100% x-rated, sonic tested and . For Volkswagen for Audi 1.4 RSI/TVs EA211 engine. We established cooperation's with em tron, mote, link, cartel, him, etc. Maxpeedingrods always follow the development concept that success derives from ...(August 17th, 2023)
• Maxpeedingrods 0y7otf Connecting Rods For Nissan S13 Silvia 180sx Bluebird Sunny Ca18 Ca18de Ca18det (36.4% similar) The fake bolts will never last under 400HP or higher. 180,000 - 210,000 psi. It effectively avoid reload scatter phenomenon. All big and small ends are finished with sunken honing machine, - precision alignment sleeves positively locate the rod cap, maintaining end bore size eliminating cap walk, ...(August 19th, 2023)
• Maxpeedingrods P1xyc7 4pcs Connecting Rods For 4g63 2nd Gen And Lancer Evo 7 Bolt Conrod Bielle Arp 2000 (42.6% similar) Full physical. Applications. 4PCS connecting rods for 4G63 2ND gen lancer Eco 7 bolt conrod belle APR 2000 . For 4G63 2ND gen lancer Eco 7 bolt, note to length :156MM/6.142. Will not fit 1g 4G63 6 bolt engines. Telephone number. For talon for RSI 1993 -1998, Mitsubishi eclipse gs 1993 -1994, GST...(August 28th, 2023)
• Maxpeedingrods 0i3fmy New 4340 Forged Connecting Rods Arp Bolts For Honda Civic L15b7 L15b9 Vtc Turbo (48.2% similar) For Honda L15B7 Tc turbo, 2016 for civic turbo us, Canada, china, 2017 si Canada m Rico, cr-v, non-LX aura CDC china, 2018 accord us Canada, please double confirm the dimensions to ensure get right parts, -, pin type: floating piston. Best costumer service. V product test and ISO 9001 ...(September 2nd, 2023)
• Maxpeedingrods 548ja0 Forged H-beam Connecting Rods Arp Bolts For Hyundai 1.6 Gamma T-gdi G4fj 130.8mm (54% similar) All big and small ends are finished with sunken 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 ...(September 2nd, 2023)
• Maxpeedingrods P1dv8l 4pcs Connecting Rods For Toyota Celica Gt-s Corolla T-sport 2zzge 2zz-ge 1.8l (37.6% similar) Best costumer service. It begins from the date purchased. V certification con rods, type: forged 4340 aircraft chrome moly quality steel for racing, h-beam conrods quantity: 4 pieces a set, bolts:including genuine APR 2000 bolts, note: extra cost upgrading to L19 bolts size: 3/8 tolerance: ...(September 18th, 2023)
• Maxpeedingrods G4n3if 4340 Connecting Rod arp 2000 Bolt For Bmw 1 Series F20 2010-2018 Hatchback 120i (46.2% similar) Fastener yield psi. A weak rod bolt in a racing engine means catastrophic disaster and will put your life at risk. V product test and ISO 9001 certified, us Facebook account: . It secure the connecting rod and bearing to crankshaft. Advertised horsepower RATING:200HP/PIECE, top acceleration: ...(September 22nd, 2023)
• Maxpeedingrods P4hsed 4pcs I-beam Racing Connecting Rod For Audi S3 1.8 20vt Apy Amk 1999 2001 144mm (48.5% similar) 4PCS i-beam racing connecting rod for Audi s3 1.8 20VT pay amok 1999 2001 144MM. Application, note: please double confirm the dimensions before purchasing, no tapered small end, for Audi / VW golf GTI 1.8T 2.0L 16V 20V 4 Cl. Advertised horsepower RATING:200HP/PIECE, top acceleration: 9000RPM, ...(September 23rd, 2023)
• Maxpeedingrods Quej2s Forged Connecting Rod And Arp Bolts For Volvo 850 C70 T5 2.3l B5234t Conrod 800hp (36.8% similar) Fastener yield psi. A weak rod bolt in a racing engine means catastrophic disaster and will put your life at risk. us Facebook account: . We care about your engine as much you do. Shot-preened finish to remove potential for stress risers, 6.HIGH precision CBC machined,precision rod cap alignment ...(September 24th, 2023)