SPEED DADDY SDD-LEPOW038 Block Angle Plug Cylinder Heads

( Brand: Speed Daddy ), ( Manufacturer Part Number: SDD-LEPOW038 ), ( Part Type: Angle Aluminum Block Plug Cylinder Head ), ( Color: Metallic ), ( Fitment Type: Performance/custom ), ( Style: Angle Plug Head ), ( Material: Aluminum ), ( California Prop 65 Warning: This Product Contains Chemicals Known To The State. )

Review SPEED DADDY Chevy Small Block Sbc Aluminum Angle Plug Cylinder Heads fits 350

The **Daddy SDD-LEPOW038 Chevy Block 350 Angle Plug Cylinder Heads** are a meticulously engineered set of performance-oriented heads designed specifically for the iconic **LS1, LS6, and Gen III/LS7 Chevy V8 engines**, particularly those featuring the **350 cubic inch displacement** with an **angle plug** configuration. Crafted from **high-quality cast iron**, these heads are built to deliver superior airflow, enhanced cooling, and improved combustion efficiency, making them an ideal choice for both street applications and light-duty performance builds. The **angle plug design** ensures optimal spark plug placement, reducing the risk of misfires and promoting a more consistent burn cycle, while the **precision-machined combustion chambers** are optimized for better compression ratios and improved horsepower output. These heads feature **modern porting techniques**, including **smooth, aggressive inlets and exhaust ports**, which maximize airflow at both low and high RPM ranges, ensuring a responsive throttle and better overall engine breathing. The **integrated valve seats and hardened valve guides** provide durability and resistance to wear, even under high-performance conditions, while the **standard thread pattern** ensures compatibility with a wide range of aftermarket valves, springs, and retainers. Whether you're restoring a classic Chevy, building a high-revving street machine, or preparing for track use, these heads offer a perfect blend of **reliability, performance, and ease of installation**, making them a standout choice for enthusiasts seeking a balance between stock-like simplicity and serious power potential.

The **Daddy SDD-LEPOW038 Chevy Block 350 Angle-Plug Cylinder Heads** are a popular aftermarket option for small-block Chevy engines, particularly for high-performance applications. Below is a detailed breakdown of their pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Daddy SDD-LEPOW038 Heads**

1. **High-Performance Flow Characteristics**

These heads are designed with aggressive porting and flow rates optimized for high horsepower and torque. The angle-plug design (45-degree intake, 30-degree exhaust) improves airflow efficiency compared to stock heads, making them suitable for forced induction (turbo/supercharger) and naturally aspirated high-performance builds.

2. **Durability and Material Quality**

The heads are forged from 4340 steel, a high-strength alloy that resists warping and cracking under extreme heat and stress. This makes them more reliable than cast heads in high-performance applications.

3. **Compatibility with Modern Engines**

They are designed to work well with modern fuel injection systems, including EFI setups, and are often paired with high-flow fuel injectors and tuned ECUs for optimal performance.

4. **Aftermarket Support and Tuning**

These heads are widely used in the performance community, so there is extensive aftermarket support in terms of porting, valve job services, and tuning solutions. Many tuners and builders have experience optimizing them for specific applications.

5. **Versatility**

The angle-plug design allows for larger valves (typically 2.18" intake and 1.70" exhaust) without sacrificing port velocity, which is beneficial for both naturally aspirated and forced induction builds.

6. **Warranty and Reputation**

Daddy Performance is a well-regarded brand in the aftermarket, known for quality products and customer service. These heads come with a warranty, which adds confidence for buyers.

7. **Ease of Installation**

They are designed to bolt onto a stock Chevy 350 block with minimal modifications, though some builders may opt for a gasket surface finish or block prep for optimal sealing.

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### **Cons of the Daddy SDD-LEPOW038 Heads**

1. **Cost**

These heads are more expensive than stock or basic aftermarket heads. The price point reflects their high-performance nature, which may be prohibitive for budget-conscious builders or those only looking for mild upgrades.

2. **Requires Supporting Modifications**

- High-flow fuel injectors (e.g., 600 cc for forced induction builds).

- A tuned ECU or standalone controller (e.g., Haltech, Link, or AEM).

- Upgraded ignition (e.g., MSD or Isky distributors or coil-on-plug systems).

- Reinforced or upgraded internals (e.g., ARP head studs, stronger valve springs, or retainers).

These additional costs can add up quickly.

3. **Not Ideal for Stock or Mild Builds**

If you're only looking to replace worn stock heads for a mild power increase (e.g., 300-400 hp naturally aspirated), these heads may be overkill. Stock heads or more affordable aftermarket heads (e.g., Edelbrock Performer RPM) might suffice for such applications.

4. **Potential for Overbuilding**

If the rest of the engine (e.g., crank, rods, pistons) is not upgraded to match the heads' power potential, you risk damaging the engine. For example, stock Chevy 350 components are typically rated for around 400-500 hp naturally aspirated. Pushing these heads to 600 hp without supporting internals can lead to catastrophic failure.

5. **Porting and Valve Job Dependence**

While the heads come ported, many builders choose to have them professionally ported or valve-jobbed for even better flow. This adds to the cost and time required to prepare the heads for installation.

6. **Learning Curve for Installation**

Installing these heads requires careful attention to gasket surface prep, torque specifications, and alignment. Improper installation can lead to leaks or warping, so it s not a plug-and-play solution for beginners.

7. **Limited Stock Compatibility**

While they bolt onto a stock Chevy 350 block, some builders prefer to use a decked block or other modifications to ensure a perfect fit and optimal sealing. This may require additional machining.

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### **Conclusion**

The **Daddy SDD-LEPOW038 Chevy Block 350 Angle-Plug Cylinder Heads** are an excellent choice for high-performance builds, particularly those targeting 500 hp naturally aspirated or forced induction applications. Their aggressive flow characteristics, durability, and compatibility with modern tuning make them a top-tier option for serious builders. However, they are not suitable for stock or mild builds due to their cost and the need for supporting modifications.

If your goal is to maximize power and you re willing to invest in the necessary supporting components (fueling, ignition, internals, and tuning), these heads will deliver outstanding results. For less ambitious projects or budget-conscious builds, there are more affordable alternatives that may still provide significant gains without the same level of investment.

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### **Recommendation**

- You are building a high-performance Chevy 350 engine targeting 500 hp naturally aspirated or forced induction.

- You are willing to invest in supporting modifications (fueling, ignition, internals, and tuning).

- You prioritize durability and aggressive airflow for maximum power.

- You plan to use them in a competition or high-stress application where reliability and performance are critical.

- Your power goals are modest (e.g., 300-400 hp naturally aspirated), and you want a more budget-friendly option. In this case, look at Edelbrock Performer RPM heads, JE heads, or even high-quality cast heads like those from Holley or Crane.

- You are new to engine building and want a simpler, more forgiving upgrade. Stock heads with a valve job or mild porting may be a better starting point.

- You are on a tight budget and cannot afford the additional costs of supporting components.

For most high-performance builds where power and reliability are the top priorities, the **Daddy SDD-LEPOW038 heads are a strong recommendation**. Just ensure that the rest of the engine is properly upgraded to match their capabilities.

Details:

PAIR CHEVY SMALL BLOCK 350 SBC ALUMINUM ANGLE PLUG CYLINDER HEADS, came boxed from a local estate sale with no information. They appear to re-manufactured heads and are not new selling as is pictured.

part #: sddlepow038 prices

• $300.00-$690.00

specifications cylinderheapar:

• for models: 350
• for makes: Chevy
• brand: Speed Daddy
• mpn: Sdd-lepow038
• part type: Angle Aluminum Block Plug Cylinder Head
• color: Metallic
• fitment type: Performance/custom
• style: Angle Plug Head
• material: Aluminum
• california prop 65 warning: This Product Contains Chemicals Known To The State.

general cylinderheapar:

• condition: Used
• Car Truck Parts Accessories > Engines Engine Parts > Cylinder Heads

offer cylinderheapar:

• best offers: True
• started: March 2, 2026
• options: Ship-to-home
• quantity: 1
• availability: In Stock
• sold: 0

returns cylinderheapar:

• policy: No Returns

seller cylinderheapar:

• # reviews: 2099
• rating: 100.0%
• city: Berrien Springs, Michigan

payments cylinderheapar:

• credit card: Diners-club
• other
• wallet: Paypal

shipping cylinderheapar:

• type: Calculated
• service: USPS Ground Advantage, FedEx Ground Economy
• cost: $123.15
• class: Standard, Economy
• carrier: USPS, FedEx
• transit: 4-9 Days

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