
703066Z Comparison
| photo | price | summary | rating |
|---|---|---|---|
![]() | $40.36 | Condition is New, Eastwood 70366Z, One Trim Black Matte Aftermarket High Performance Racing Part, FREE SHIPPING | 98.9% |
![]() | $41.03 | Condition is New, Eastwood 70366Z, One Trim Black Matte Aftermarket High Performance Racing Part, FREE SHIPPING | 96.9% |

The Eastwood 703066z and 70366z High Performance Racing Cylinder Heads are engine components designed to deliver superior power and efficiency for racing applications. These heads are meticulously engineered and crafted to provide optimal combustion and airflow for high-performance engines.
The 703066z and 70366z heads are CNC machined from premium aluminum alloy for exceptional strength and lightweight design. They feature large, rectangular combustion chambers that increase the volume of the charge for more efficient combustion. The heads also boast large, high-flow intake and exhaust ports that reduce restriction and allow more air and exhaust gases to flow in and out of the engine.
The 703066z head comes with a 60cc larger deck for improved ring sealing and increased compression. It also features a raised piston boss design for enhanced oil flow and improved cooling. The 70366z head, on the other hand, is designed for applications that require a larger valve size, with oversized intake and exhaust valves for increased airflow and power.
Both heads come with fully machined surfaces, including valve seats, deck surfaces, and skirt surfaces, for a perfect fit and seamless installation. They also feature a match-port design for easy integration with various intake and exhaust systems.
The Eastwood 703066z and 70366z High Performance Racing Cylinder Heads are ideal for racers and high-performance engine builders who demand maximum power, efficiency, and reliability. With their large combustion chambers, high-flow ports, and robust design, these heads are the perfect choice for taking your engine to the next level.
The Eastwood 703066z and 70366z High Performance Racing Cylinder Heads are aftermarket cylinder heads designed for improved engine performance in racing applications. Here are some pros and cons that might help you make an informed decision about purchasing these cylinder heads:
Pros:1. Enhanced Performance: These cylinder heads are designed to provide better flow rates and improved combustion efficiency, which can lead to increased horsepower and torque.
2. Durability: Eastwood is known for producing high-quality aftermarket parts, and these cylinder heads are no exception. They are made with robust materials that can withstand the rigors of racing.
3. Customizability: These cylinder heads come with adjustable valve springs, which allow for fine-tuning of the engine to optimize performance.
4. Affordability: Compared to OEM (original equipment manufacturer) cylinder heads, aftermarket options like the Eastwood 703066z and 70366z are often more affordable.
Cons:1. Requires Expert Installation: Installing aftermarket cylinder heads can be a complex process that requires specialized knowledge and tools. It is recommended that these heads be installed by a professional mechanic or engine builder.
2. Potential for Engine Tuning: The increased performance of these cylinder heads may require additional engine tuning to ensure optimal performance and prevent engine damage.
3. Compatibility: These cylinder heads are designed for specific engine applications, so it is important to ensure that they are compatible with your engine before making a purchase.
In conclusion, the Eastwood 703066z and 70366z High Performance Racing Cylinder Heads offer several advantages such as enhanced performance, durability, and affordability. However, they also come with some drawbacks such as the requirement for expert installation and potential engine tuning.
If you are comfortable with the installation process and are looking for a cost-effective way to improve your engine's performance, these cylinder heads could be a good option for you. However, if you are not confident in your ability to install them or if you are looking for a more turnkey solution, you may want to consider other options. Ultimately, it is important to carefully consider your specific needs and circumstances before making a purchase decision.
Details:
Eastwood 70366Z, one trim black matte aftermarket high performance racing part.
specifications specipaint:
- brand: Eastwood
- mpn: 703066z
- quantity: One
- finish: Matte
- manufacturer warranty: Lifetime
- fitment type: High Performance And Racing Parts
- product details: All Product Details Available Below
- package weight: 1.19 Lbs
- package length: 9.25 In
- package width: 3 In
- international customers: Hassle-free Global Shipping, We Handle All Paperwork
- bulk and special orders: Bulk Purchases Special Orders Available On Request
seller specipaint:
- # reviews: 1430
- city: watervliet, michigan
- rating: 98.2%
offer specipaint:
- in stock #: 2
- availability: in stock
- started: july 29, 2025
- prices: $40.36–$41.03
- item condition: New
- sold #: 16
- options: ship-to-home
shipping specipaint:
- type: fixed
- class: standard, expedited
- service: fedex ground or fedex home delivery, fedex 2day
- transit: 2-4 days
- carrier: fedex
returns specipaint:
- policy: returns accepted
- paid by: seller
- time: 60 days
general specipaint:
- category: Auto Parts > Paints Supplies > Specialty Coatings > Rust Prevention
payments specipaint:
- credit card: diners-club
- other
- wallet: google-pay
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- 98188Z: EXHAUST MANIFOLD PAINT, Eastwood

