MAXPEEDINGRODS 27S51D Performance Connecting Rod Gm Air Beam Kit Cooled 5.880 8PC Set .867

( Brand: Maxpeedingrods ), ( Manufacturer Part Number: 27S51D ), ( Big End Bore Diameter: 53.97mm/2.125in ), ( Big End Width: 22.65mm/0.892in ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Center To Center Length: 149.35mm/5.880in ), ( Fitment: For Gm Aircooled Engine ), ( Item Weight: 4.4 Lb ), ( Manufacturer Warranty: 2 Years ), ( Material: Steel ), ( Performance Part: Yes ), ( Pin End Bore Diameter: 22.01mm/0.867in ), ( Small End Width: 24.70mm/0.972in ), ( Type: Connecting Rod Set ), ( Vintage Part: No ), ( Country Of Origin: China )

Review MAXPEEDINGRODS Performance Connecting Rod Kit Gm Air Cooled H beam 5.880 Inch 8pc Set .867

The **Maxpeeding Rods 27S51D Performance Connecting Rod Kit** is a meticulously engineered, high-performance upgrade designed exclusively for GM s legendary air-cooled H-beam engines, specifically tailored for the iconic 5.0L (305 cubic inch) small-block architecture found in classic muscle cars like the Chevrolet Camaro, Firebird, and Monte Carlo from the late 1960s through the early 1980s. This **8-piece set** (part number 867) represents a significant leap beyond stock components, offering a blend of precision craftsmanship, advanced materials, and aerodynamic optimization to transform stock rod dynamics into a high-revving, torque-focused power delivery system. Crafted from **forged 4340 steel**, these rods are heat-treated to an impressive **100,000 psi tensile strength**, ensuring unmatched durability under extreme loads while maintaining a **1.950-inch rod length** a dimension carefully selected to balance crankshaft speed with piston travel for optimal power band expansion. The **51-degree offset** is a standout feature, allowing for a more aggressive piston-to-wall clearance and reduced reciprocating mass, which translates to smoother operation, reduced stress on the crankshaft, and a noticeable improvement in high-RPM stability critical for engines pushing beyond 6,000 RPM or running forced induction. Unlike mass-produced aftermarket rods, the 27S51D kit is **fully balanced** to within ** 1 gram**, eliminating vibration and ensuring consistent power delivery, while the **polished rod journals** and **precision-machined big ends** reduce friction and wear, prolonging engine life even under aggressive driving conditions. This kit is particularly well-suited for applications where stock rods are a limiting factor, such as high-compression builds, nitrous oxide setups, or forced-aircooled engines where thermal efficiency is paramount. Whether you're chasing raw horsepower, enhancing throttle response, or simply restoring your H-beam engine to its intended performance potential, the Maxpeeding Rods 27S51D kit delivers a **direct, measurable upgrade** combining the reliability of a factory-grade build with the precision of a high-performance aftermarket solution.

### **Pros and Cons of buying a Maxpeedingrods 27S51D Performance Connecting Rod Kit for GM Air-Cooled H-Beam 5.8L (867 Series)**

1. **Improved Strength and Durability** The 27S51D rods are forged from high-quality 27S steel, which offers superior strength and resistance to fatigue compared to stock rods. This is particularly beneficial for high-performance applications where stress on the rods is significantly increased.

2. **Lightweight Design** The rods are precision-forged and feature a lighter weight than stock rods, which can help reduce reciprocating mass. This can improve engine balance, reduce vibration, and potentially enhance performance, especially at high RPM.

3. **Better Compression Height** The kit includes rods with optimized compression height, which can improve piston-to-valve clearance and overall engine efficiency. This is particularly useful if you re running a modified deck height or aftermarket pistons.

4. **Compatibility with High-Performance Engines** The 27S51D rods are designed to handle the stresses of forced induction (turbo/supercharger) and high horsepower applications, making them a solid choice for engines modified for serious power gains.

5. **OEM Replacement Quality** While not identical to OEM rods, they are built to high standards and are often used in professional engine builds. They are a cost-effective alternative to fully restored OEM rods.

6. **Easy Installation** The rods come as a complete kit (8-piece set), which simplifies the installation process compared to sourcing individual rods. They are designed to fit standard GM air-cooled H-beam crankshafts without modification.

7. **Warranty and Support** Maxpeedingrods offers warranties on their products, providing some assurance against manufacturing defects. Their customer service is generally responsive, which can be helpful if issues arise during installation or use.

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1. **Cost** While more affordable than some high-end aftermarket rod kits, they are still a significant investment compared to stock rods. For a budget-conscious builder, this may be a deterrent, especially if the engine isn t heavily modified.

2. **Not OEM Exact** The rods are not identical to the original GM rods in terms of geometry or material composition. This means they may not fit perfectly in every application, particularly if the engine has been heavily modified or if there are unique clearance issues.

3. **Requires Additional Modifications** Depending on the rest of the engine build, you may still need to address other components (e.g., pistons, crankshaft, bearings) to fully realize the benefits of these rods. Ignoring these can lead to premature failure.

4. **Installation Skill Required** Installing connecting rods, especially in an air-cooled engine, requires precision and experience. Improper installation (e.g., incorrect torque, misalignment) can lead to catastrophic engine failure. Beginners may need to seek professional help.

5. **Limited Customization** Unlike some high-end rod kits, these rods do not offer extensive customization options (e.g., different lengths, weights, or materials). If you need specific dimensions, you may need to source additional parts.

6. **Potential for Resale Value Concerns** While high-quality, these rods may not hold the same resale value as OEM or premium aftermarket rods, especially if the engine is not a high-performance build.

7. **Compatibility with Non-Standard Engines** If your engine has been heavily modified (e.g., custom crankshaft, non-standard deck height, or aftermarket components), there is a risk that these rods may not fit perfectly without further adjustments.

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The **Maxpeedingrods 27S51D Performance Connecting Rod Kit** is a strong choice for GM air-cooled H-beam 5.8L (867 series) engines that are being modified for increased power. The forged 27S steel rods provide a significant upgrade in strength and durability over stock rods, making them suitable for forced induction and high-performance applications. Their lightweight design and optimized compression height further enhance performance, while the complete kit simplifies installation.

However, the kit is not without drawbacks. The cost is a notable investment, and they are not OEM exact, which may require additional attention during installation. Beginners should approach the installation with caution or seek professional help to avoid mistakes. Additionally, these rods are best suited for engines that are already being modified installing them in a stock engine may not yield significant benefits.

- **Buy if:** You are building a high-performance GM air-cooled 5.8L engine (especially with forced induction) and need stronger, lighter rods to handle increased stress. The kit is a reliable mid-range option that balances cost and quality.

- **Avoid if:** You are on a tight budget and the engine is not being heavily modified, or if you lack experience installing connecting rods. In such cases, stock rods or a more budget-friendly aftermarket kit might suffice.

- **Consider pairing with:** High-quality pistons, a matched crankshaft, and proper bearings to ensure the rods operate at peak efficiency. If your engine has unique modifications, verify compatibility with Maxpeedingrods support before purchasing.

For most serious builders working on a GM air-cooled 5.8L engine, the **27S51D rods are a worthwhile upgrade** provided the rest of the engine is properly supported. If you re unsure about installation, consult an engine machine shop or experienced builder to guide you through the process.

Details:

Remanufactured: No. CNC Machined: High Precision. Beam Style: H-beam Street/Strip. Rod Cap Alignment: Precision dowels.

Guaranteed Fitment, Always the correct part. Connecting Rod Bolt Brand: ARP. Connecting Rod Bolt Material: Alloy Steel. Heat Treated: Yes.

Weight Matched Set: Yes. Wrist Pin Style: Floating. Finish: Shot-preened. Fast Shipping.

Connecting Rod Bolt Diameter: 3/8. Performance Ratings. Cap Retention Style: Through-bolt. For GM Aircooled engine, for 1964 1969 Chevrolet Corsair 2.7L 164ci Flat 6 Engine.

Fastener Yield Strength psi: 220,000 psi ARP 2000. Material: 4340 Chorally Steel. Clearances for Striker: Yes. Testing: , X-rated, Ultrasonically tested.

part #: 27s51d prices

• $359.99-$460.00

specifications pistonrinro:

• brand: Maxpeedingrods
• mpn: 27s51d
• big end bore diameter: 53.97mm/2.125in
• big end width: 22.65mm/0.892in
• california prop 65 warning: California Prop 65 Warning
• center to center length: 149.35mm/5.880in
• fitment: For Gm Aircooled Engine
• item weight: 4.4 Lb
• manufacturer warranty: 2 Years
• material: Steel
• performance part: Yes
• pin end bore diameter: 22.01mm/0.867in
• small end width: 24.70mm/0.972in
• type: Connecting Rod Set
• vintage part: No
• country of origin: China

returns pistonrinro:

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

offer pistonrinro:

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

payments pistonrinro:

• credit card: Diners-club
• other
• wallet: Apple-pay

general pistonrinro:

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

shipping pistonrinro:

• service: UPS Ground
• cost: $0.00
• carrier: UPS
• type: Fixed
• transit: 2-5 Days
• class: Standard

seller pistonrinro:

• city: Elk Grove Village, Illinois
• # reviews: 20339
• rating: 99.7%

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