Upgrading from a V-belt to a serpentine belt setup on a small block Chevy improves reliability, reduces belt slippage, and simplifies accessory drive maintenance. We researched and compared the top kits based on manufacturer specifications, published industry standards, and aggregated owner feedback. Our evaluation focuses on fitment, belt tensioning design, pulley quality, and overall system integration.
Each kit was assessed for compatibility with common small block Chevy configurations, including standard and reverse rotation water pumps, and various accessory layouts. Below are our findings, with honest limitations and who should consider each option.
| Photo | Product | Score | Buy |
|---|---|---|---|
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March Performance 2050 Serpentine System Best Overall Includes water pump, alternator, power steering, and AC pulleys; 8-rib belt; billet aluminum construction |
9.2 | 🛒 Check Price |
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CVF Racing SBC Serpentine Kit Best Value Includes water pump, alternator, power steering, and AC pulleys; 6-rib belt; cast iron brackets |
8.8 | 🛒 Check Price |
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Holley 20-151 Serpentine Belt Drive Kit Premium Upgrade Includes reverse rotation water pump, alternator, and power steering pulleys; 8-rib belt; CNC-machined aluminum |
9.0 | 🛒 Check Price |
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Billet Specialties 8-Rib Serpentine System Billet Beauty 8-rib belt; billet aluminum pulleys; includes alternator, power steering, and water pump pulleys |
8.7 | 🛒 Check Price |
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Trans-Dapt Performance 4320 Serpentine Kit Budget Pick 6-rib belt; steel pulleys; includes water pump, alternator, and power steering |
7.8 | 🛒 Check Price |
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Dorman 635-800 Serpentine Belt Conversion Kit OE Replacement 6-rib belt; includes water pump pulley, alternator pulley, and tensioner; cast aluminum brackets |
8.1 | 🛒 Check Price |
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Edelbrock 8711 Serpentine Belt Drive System Performance Icon 8-rib belt; includes water pump, alternator, and power steering pulleys; aluminum brackets |
8.4 | 🛒 Check Price |
1. March Performance 2050 Serpentine System: Best Overall
The March Performance 2050 Serpentine System is a premium kit designed for small block Chevy engines that demand top-tier performance and reliability. In our evaluation based on manufacturer specs and owner feedback, the billet aluminum pulleys offer superior strength and weight savings over cast alternatives. The kit includes a bracket set that accommodates both standard and reverse rotation water pumps, making it versatile for various engine builds. Owners consistently report easy installation and zero belt alignment problems, which is critical for preventing premature wear.
However, the premium price point may be a barrier for budget-conscious builders. Those who do not require the absolute best or are building a low-horsepower cruiser might find the investment unnecessary. Additionally, the kit does not include an alternator or power steering pump, so you must source those separately. If you prioritize longevity and precision and have the budget, this is a top choice.
- Precision-machined billet aluminum pulleys for minimal runout and long life
- Compatible with standard and reverse rotation water pumps
- Includes all necessary brackets, hardware, and a high-quality Gates belt
Pros: Exceptional build quality and fitment; Smooth belt tracking with no misalignment issues
Cons: Higher cost compared to some competitors
2. CVF Racing SBC Serpentine Kit: Best Value
The CVF Racing SBC Serpentine Kit strikes an excellent balance between cost and functionality. Based on owner feedback and spec sheet analysis, the cast iron brackets are robust and resist flex under load, while the 6-rib belt is sufficient for most street and mild performance applications. The kit is comprehensive, covering alternator, power steering, and AC, which simplifies the ordering process. Many DIY builders appreciate the straightforward installation, though some have noted that the brackets may require slight filing for perfect alignment on certain engine blocks.
Where this kit falls short is in material choices: the water pump pulley is steel rather than aluminum, adding rotational mass. For high-rpm racing engines, this could be a drawback. Also, the belt tensioning system relies on a fixed bracket rather than a spring-loaded tensioner, which may require periodic manual adjustment. If you are on a budget and building a street-driven small block, this kit delivers reliable performance without breaking the bank.
- Complete kit includes all pulleys, brackets, and a serpentine belt
- Cast iron brackets provide sturdy mounting with minimal flex
- Available with or without AC provisions
Pros: Affordable without sacrificing essential quality; Good compatibility with most small block Chevy accessories
Cons: Water pump pulley is steel instead of aluminum, adding weight; Some owners report need for minor bracket modifications
3. Holley 20-151 Serpentine Belt Drive Kit: Premium Upgrade
The Holley 20-151 Serpentine Belt Drive Kit is engineered for performance-oriented small block Chevy builds, particularly those using Holley EFI systems. Our research indicates that the CNC-machined aluminum pulleys are among the lightest and strongest available, reducing parasitic drag. The spring-loaded tensioner maintains optimal belt tension automatically, a significant advantage over manual adjusters. Owners report excellent belt tracking even at 7,000+ RPM, making it a favorite for track cars.
However, this kit is designed exclusively for reverse rotation water pumps, which may require additional modifications if your engine currently uses a standard rotation pump. It also does not include AC provisions, limiting its use for street cars with air conditioning. The price is on the higher side, and for a mild street build, the cost may not be justified. If you are building a high-horsepower small block and want the best belt retention, this kit is a strong contender.
- CNC-machined 6061-T6 aluminum pulleys for reduced weight and high strength
- Designed specifically for Holley EFI systems and high-horsepower builds
- Includes a spring-loaded belt tensioner for consistent tension
Pros: Excellent for high-RPM applications with minimal belt slip; Integrated tensioner simplifies maintenance
Cons: Requires reverse rotation water pump, not compatible with standard pumps; Premium price may be overkill for stock engines
4. Billet Specialties 8-Rib Serpentine System: Billet Beauty
The Billet Specialties 8-Rib Serpentine System is aimed at enthusiasts who want both performance and aesthetics. The billet aluminum pulleys are available in polished or black anodized finishes, and our evaluation based on owner feedback confirms they hold up well against road grime. The 8-rib belt provides ample grip for high-output alternators and power steering pumps. Installation is straightforward for those familiar with small block Chevy accessory drives, though the lack of a complete bracket kit means you need to source brackets separately.
The main downside is the absence of an AC pulley, which may be a deal-breaker for daily drivers needing air conditioning. Additionally, the cost of the pulley set plus brackets can approach that of a full kit from competitors. If you are building a show car or a street machine where appearance matters and you don’t need AC, this system offers a beautiful and functional solution. However, for a practical all-in-one kit, other options provide better value.
- Show-quality billet aluminum pulleys with polished or black anodized finish
- Compatible with standard rotation water pumps
- Includes a heavy-duty 8-rib belt for reduced slip
Pros: Stunning appearance with excellent corrosion resistance; Strong belt grip due to 8-rib design
Cons: No AC pulley included; must be purchased separately; Bracket kit sold separately, increasing overall cost
5. Trans-Dapt Performance 4320 Serpentine Kit: Budget Pick
The Trans-Dapt Performance 4320 Serpentine Kit is a budget-friendly option for converting a small block Chevy from V-belts to a serpentine system. Based on owner reports and spec sheet analysis, the steel pulleys are durable but add rotational mass, which can affect throttle response. The kit includes all necessary components for water pump, alternator, and power steering, but does not accommodate AC. Many users found the brackets required minor modifications to achieve proper alignment, which may be frustrating for novice installers.
While the low price makes it accessible, the trade-offs in material quality and fitment precision are notable. The steel pulleys are prone to rust if the powder coat chips, and the lack of a tensioner means the belt must be manually adjusted. This kit is best suited for budget builds where cost is the primary concern, and where the owner is comfortable with some DIY adjustments. For a daily driver or high-performance application, we recommend investing in a higher-quality kit.
- Complete kit at an entry-level price point
- Steel pulleys with black powder coat finish
- Includes mounting brackets and hardware
Pros: Very affordable for a full serpentine conversion; Covers basic accessories: water pump, alternator, power steering
Cons: Steel pulleys are heavier and may cause belt wear over time; Installation can be tricky; some owners report alignment issues
6. Dorman 635-800 Serpentine Belt Conversion Kit: OE Replacement
The Dorman 635-800 Serpentine Belt Conversion Kit is intended for small block Chevy owners who want to replace worn-out factory serpentine components. In our research, the cast aluminum brackets and tensioner are well-made and offer a direct fit for many GM vehicles that originally came with serpentine belts. The included tensioner is a plus, as it reduces maintenance. However, this kit is not a complete conversion from V-belts; it only replaces the water pump and alternator pulleys and the tensioner. You will need to source power steering and AC pulleys separately if required.
Owner feedback indicates that the kit works well when matched with the correct OE-style accessories, but it may not align properly with some aftermarket alternators or power steering pumps. It is not suitable for those building a custom serpentine system from scratch. If you are restoring a factory serpentine small block Chevy and need a reliable replacement for worn pulleys, this kit is a solid choice. For a full custom setup, look elsewhere.
- Designed as a direct replacement for factory serpentine setups
- Cast aluminum brackets are lightweight and corrosion-resistant
- Includes a spring-loaded tensioner for consistent belt tension
Pros: Easy installation for those with existing serpentine accessory drive; Good value for restoring a factory-style setup
Cons: Limited to specific accessory configurations; may not fit all aftermarket brackets; Does not include power steering or AC pulleys
7. Edelbrock 8711 Serpentine Belt Drive System: Performance Icon
The Edelbrock 8711 Serpentine Belt Drive System is a performance-oriented kit that combines style and function. Based on manufacturer specs and owner feedback, the polished aluminum pulleys are lightweight and resist corrosion. The 8-rib belt and dual-bearing idler pulley ensure minimal belt slip even under high load. Installation is typical for aftermarket kits, with clear instructions, though some users noted that the alternator bracket may require slight adjustment for certain alternator models.
The biggest limitation is the lack of AC support. This kit is designed for performance applications where air conditioning is removed or not needed. Additionally, the price is higher than some competitors that offer similar features. If you are building a street/strip small block and want the Edelbrock brand reputation and a clean look, this kit is a good option. However, for a street car with AC, you will need to look elsewhere or add a separate AC bracket.
- Edelbrock signature polished aluminum pulleys
- Designed for high-horsepower small block Chevy engines
- Includes a dual-bearing idler pulley for smooth operation
Pros: Enhances engine bay appearance with polished finish; Strong belt grip with 8-rib design
Cons: Not compatible with AC; no AC pulley included; Higher cost for a kit that lacks AC provisions
Frequently Asked Questions
What is the difference between a 6-rib and an 8-rib serpentine belt?
A 6-rib belt is sufficient for most street applications and standard accessory loads, while an 8-rib belt provides additional grip for high-horsepower engines or accessories that draw more power, such as large alternators or AC compressors. The 8-rib belt reduces the risk of slippage at high RPM but requires pulleys designed for the wider belt.
Can I use a standard rotation water pump with a serpentine kit?
It depends on the kit. Some serpentine kits are designed for standard rotation water pumps, while others require reverse rotation pumps. Always check the kit specifications before purchasing. Converting from standard to reverse rotation may require a different water pump and possibly a different fan setup.
Do I need to buy additional brackets or pulleys separately?
Many serpentine kits come with all necessary brackets and pulleys for the accessories they cover (typically water pump, alternator, and power steering). However, some kits exclude AC pulleys or require separate bracket kits. Review the included components carefully before ordering.
How difficult is it to install a serpentine belt kit on a small block Chevy?
Installation difficulty varies by kit. Most kits are designed for DIY installation with basic hand tools, but some may require minor modifications like filing brackets or aligning pulleys. Owners with moderate mechanical experience can typically complete the job in a weekend. Kits with spring-loaded tensioners are easier to adjust than those with manual adjusters.
Will a serpentine conversion improve engine performance?
While a serpentine conversion does not directly increase horsepower, it reduces belt slippage and parasitic drag compared to V-belts, which can free up a small amount of power. More importantly, it improves reliability and reduces the chance of belt failure. For high-RPM applications, the improved belt grip is beneficial.
Our Verdict
After researching and comparing the top serpentine belt setups for small block Chevy engines, we recommend the March Performance 2050 Serpentine System as the best overall for its precision billet construction, excellent fitment, and long-term reliability. For those seeking the best value, the CVF Racing SBC Serpentine Kit offers a complete solution at a reasonable price, though it uses steel pulleys instead of aluminum. Choose based on your budget and performance needs.
Last reviewed and spec-checked: June 6, 2026. We re-check our picks and listings periodically.
