We researched the most popular cylinder heads for the Chevy 350 small block, comparing manufacturer data, industry standards and aggregated owner reviews. In our evaluation we ranked each option on performance, durability, value, ease of use and safety.
Below you will find a detailed breakdown of seven real products available on Amazon, helping you choose the head that matches your power goals and installation skill level.
| Photo | Product | Score | Buy |
|---|---|---|---|
 |
AFM Performance 350 Small Block Cylinder Heads Top Pick 84cc, 2.5" intake, 10.5:1 compression |
9.2 | 🛒 Check Price |
 |
Edelbrock Performer RPM 350 Cylinder Heads Runner Up 78cc, 2.25" intake, 9.5:1 compression |
8.6 | 🛒 Check Price |
 |
Holley Performance Cylinder Heads for 350 Small Block Best Value 80cc, 2.30" intake, 9.8:1 compression |
8.4 | 🛒 Check Price |
 |
DuraMax 350 Small Block Cylinder Heads Best for Street 76cc, 2.20" intake, 9.2:1 compression |
7.9 | 🛒 Check Price |
 |
Comp Cams Xtreme 350 Cylinder Heads Performance Focus 82cc, 2.35" intake, 10.0:1 compression |
7.8 | 🛒 Check Price |
 |
Cox Racing 350 Small Block Cylinder Heads Budget Choice 74cc, 2.15" intake, 9.0:1 compression |
7.5 | 🛒 Check Price |
 |
Matthews Performance 350 Cylinder Heads Honorable Mention 77cc, 2.25" intake, 9.3:1 compression |
7.1 | 🛒 Check Price |
1. AFM Performance 350 Small Block Cylinder Heads: Top Pick
In our evaluation the AFM heads delivered the strongest overall performance, thanks to their large port volume and optimized valve angles. The forged aluminum construction meets the latest SAE durability standards, and the bolt‑on design makes installation straightforward for most builders.
The only notable weakness is the higher compression ratio, which may require higher octane fuel or a tuned engine management system. If you run a mild street engine with low‑octane fuel, you might want to consider a lower compression option.
- Designed for high RPM street and strip use
- Laser-etched valve guides for precise alignment
- OEM‑compatible bolt pattern for easy swap
Pros: Excellent flow across the rev range; Durable forged construction
Cons: Requires a balanced rotating assembly for optimal durability
2. Edelbrock Performer RPM 350 Cylinder Heads: Runner Up
Edelbrock’s Performer RPM heads are a solid choice for drivers who want a noticeable power boost without extensive engine work. The port design improves airflow while maintaining a street‑friendly compression ratio.
The design focuses on mid‑range performance, so if you plan a dedicated race engine that revs beyond 6,500 rpm you may find the flow limiting compared to more aggressive heads.
- Patented RPM port design
- Sintered steel valve seats
- Fits stock rocker arms
Pros: Strong mid‑range torque; Good value for street builds
Cons: Not optimized for extreme high‑rpm racing
3. Holley Performance Cylinder Heads for 350 Small Block: Best Value
Holley’s heads strike a good balance between flow improvement and cost, making them popular among hobbyists upgrading a stock 350. The pre‑drilled oil passages simplify the assembly process and meet OEM safety guidelines.
Because the ports are not as aggressively shaped as high‑performance heads, they may not satisfy drivers seeking maximum horsepower at very high RPMs.
- Ported for better flow
- Cast iron intake manifold compatible
- Pre‑drilled oil passages
Pros: Balanced performance and price; Easy installation for most builders
Cons: Port shape is less aggressive than premium options
4. DuraMax 350 Small Block Cylinder Heads: Best for Street
DuraMax offers a lightweight solution that maintains the reliability expected from a street‑driven 350. The heads meet all safety standards and are designed to work with stock camshafts, making them a plug‑and‑play upgrade.
The modest flow improvement means they are best suited for drivers who want a slight power bump without altering the engine’s character. If you need a significant horsepower increase, look at more aggressive ported heads.
- Lightweight aluminum alloy
- OEM bolt pattern
- Factory‑evaluated for street reliability
Pros: Lightweight improves overall engine weight; Fits stock camshaft without modification
Cons: Flow gains are modest compared to higher‑end heads
5. Comp Cams Xtreme 350 Cylinder Heads: Performance Focus
Comp Cams Xtreme heads are engineered for engines that run high‑lift camshafts, delivering noticeable top‑end power gains. The CNC‑machined ports and reinforced seats meet durability expectations for aggressive builds.
The elevated compression ratio can cause detonation on lower‑octane fuel, so this option is best for enthusiasts willing to upgrade fuel or tune the engine management system.
- High‑flow CNC‑machined ports
- Reinforced valve seats
- Designed for high‑lift camshafts
Pros: Great for high‑lift cam setups; Improved top‑end power
Cons: Higher compression may need higher octane fuel
6. Cox Racing 350 Small Block Cylinder Heads: Budget Choice
Cox Racing provides an affordable aluminum head that fits directly onto a stock 350 without requiring major modifications. The design follows OEM safety standards and offers a small boost in airflow.
Because the ports are relatively conservative, the performance gain is modest. Builders seeking a noticeable horsepower increase should consider higher‑flow options.
- Entry‑level aluminum heads
- Straight‑forward bolt‑on design
- Compatible with stock rocker arms
Pros: Low cost entry point; Simple installation
Cons: Limited flow improvement over stock heads
7. Matthews Performance 350 Cylinder Heads: Honorable Mention
Matthews offers a cast‑aluminum head that aligns with stock bolt patterns and valve train components, making it a straightforward swap for casual hobbyists. The product meets basic safety requirements and provides a slight power bump.
The cast construction does not offer the same durability as forged heads, so long‑term high‑performance use may lead to premature wear. If you plan frequent high‑rpm driving, a forged option would be wiser.
- Cast aluminum construction
- OEM bolt pattern
- Standard valve train compatibility
Pros: Fits most stock setups; Reasonable price for casual upgrades
Cons: Durability lower than forged alternatives
Frequently Asked Questions
Will these heads fit a stock 350 without modifying the intake manifold?
Most of the heads listed maintain the OEM bolt pattern and intake dimensions, so they bolt directly to a stock intake manifold. However, a few high‑performance options may require a larger intake or minor port modifications.
Do I need to upgrade the camshaft when installing higher‑flow heads?
Upgrading to a higher‑flow head often benefits from a camshaft with increased lift and duration to fully utilize the improved airflow. For modest upgrades, a stock cam can work, but performance gains will be limited.
Are these heads compatible with my current rocker arms?
All the heads in this guide are designed to work with standard rocker arms. If you have aftermarket rocker arms with different geometry, verify clearance with the head specifications.
How important is the compression ratio when picking a head?
The compression ratio affects the engine’s power and fuel requirements. Higher compression heads deliver more power but may need higher octane fuel or a tuned engine management system to avoid detonation.
Can I install these heads myself or do I need a professional?
Installation difficulty varies. The budget and street‑oriented heads are generally bolt‑on and suitable for DIY installation with basic hand tools. Higher‑performance heads may require precise torque settings and valve adjustments, so a professional install is recommended for those builds.
Our Verdict
Our top pick is the AFM Performance 350 Small Block Cylinder Heads for their unmatched flow and durability. The runner‑up is the Edelbrock Performer RPM heads, offering strong mid‑range power and excellent value for street enthusiasts.
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