CHEVROLET 1407088 Rectangle Cylinder Heads Port Big Block Gm General 502

( Brand: Chevrolet ), ( Manufacturer Part Number: 1407088 ), ( Type: Cylinder Head ), ( Items Included: Valve Springs, Retainers ), ( Valves: Installed ), ( Material: Cast Iron ), ( Vintage Part: Yes ), ( Country Of Origin: United States )

Review CHEVROLET General Motors Rectangle Cylinder Heads Port Big Block 502 088 Gm Chevy Pair fits LS7 454

The **Chevrolet 1407088 Rectangle Cylinder Heads** are a meticulously engineered, high-performance component designed exclusively for the legendary **GM LS7-based big-block engines**, including the **502ci, 454ci, and 088ci** configurations. These heads are crafted from **high-strength, precision-machined aluminum**, ensuring an optimal balance between weight reduction and structural integrity, which is critical for maintaining reliability under extreme power outputs. The **rectangular port design** is a hallmark of modern high-performance cylinder heads, offering superior airflow characteristics compared to traditional round ports. This geometry allows for a more aggressive valve angle, enabling better velocity and volume of intake and exhaust gases, which translates directly into increased horsepower and torque. The **intake ports** feature a smooth, tapered contour that minimizes turbulence while maximizing airflow efficiency, while the **exhaust ports** are optimized for rapid scavenging, reducing backpressure and improving engine breathing. These heads are compatible with **LS7-style valve springs, retainers, and pushrods**, ensuring seamless integration with the rest of the engine s high-performance drivetrain. Whether installed in a **muscle car, street rod, or high-performance truck**, these cylinder heads are engineered to deliver **unmatched performance** while maintaining durability under sustained high-RPM operation. Built to GM s exacting standards, they are a premium choice for enthusiasts seeking to unlock the full potential of their big-block LS7 engine.

### **Pros and Cons of Buying GM Chevy LS7 Rectangle Cylinder Heads (Part Number 1407088)**

#### **Overview**

The **GM LS7 rectangle cylinder heads (part #1407088)** are a high-performance aftermarket upgrade designed for **big-block Chevy engines**, particularly those in the **502ci, 454ci, and 088ci** displacement ranges. These heads are often used in **LS7-based engines, small-block Chevy swaps, or high-performance applications** where increased airflow and reliability are desired.

---

### **Pros**

1. **Increased Airflow and Horsepower**

- The **rectangular port design** improves airflow compared to traditional round ports, allowing for better **induction and exhaust scavenging**.

- Optimized for **high RPM performance**, making them ideal for **supercharged, turbocharged, or naturally aspirated high-RPM applications**.

- Can support **larger valves** (up to **2.20" intake / 1.60" exhaust** in some configurations), increasing displacement potential.

2. **Durability and Strength**

- Cast from **high-quality aluminum alloy**, these heads are **lighter than iron** while maintaining structural integrity.

- Designed to handle **high compression ratios and forced induction**, reducing the risk of warping or cracking under extreme loads.

- Often feature **reinforced valve springs and retainers** for better durability in aggressive applications.

3. **Compatibility with LS7 and Big-Block Swaps**

- While originally intended for **LS7 engines**, these heads can be **ported and polished** to fit **small-block Chevy swaps** in big-block applications.

- Some versions include **LS7-style valve springs and guides**, improving reliability in high-RPM scenarios.

- Can be used in **crankshaft swaps** (e.g., **088ci or 454ci**) when paired with the correct deck height and block modifications.

4. **Aftermarket Support and Tuning Flexibility**

- Widely available from **aftermarket manufacturers** (e.g., **JE, Edelbrock, Crane, and others**), allowing for **custom porting and polishing**.

- Works well with **ECU tuning** (e.g., **Haltech, Link, or standalone ECUs**) to optimize fueling and timing for the increased airflow.

- Can be paired with **high-flow intake manifolds** (e.g., **Edelbrock Victor Jr., JE Manifolds**) for further gains.

5. **Potential for Forced Induction**

- The **strong valve springs** and **durable construction** make these heads suitable for **supercharging (e.g., LS7-style blower mounts)** or **turbocharging** with proper support components.

- When paired with a **turbo kit**, they can help prevent **valve float** at high RPMs.

6. **Aesthetic and Customization Appeal**

- The **distinctive rectangular port shape** is a **popular choice for custom engine builds**, especially in **high-performance and drag racing applications**.

- Can be **anodized or painted** for a custom look while maintaining performance.

---

### **Cons**

1. **Cost**

- These heads are **not cheap**, typically ranging from **$800 $1,500 per pair** depending on the manufacturer and modifications.

- Additional costs include **porting, polishing, valve job, and gasket replacement**, which can add **$500 $1,000 ** to the total bill.

2. **Compatibility Issues**

- **Not a direct drop-in replacement** for most **big-block Chevy engines** requires **block modifications** (e.g., **deck height changes, rod journal spacing adjustments**).

- **LS7 heads have a different valve cover pattern** than traditional small-block Chevy heads, requiring **custom valve covers or adapters**.

- **Crankshaft and rod spacing** must be verified to ensure proper clearance with the new heads.

3. **Learning Curve for Installation**

- **Decking the block** (if needed).

- **Valve job and spring installation** (some versions require **LS7-style springs**).

- **Proper gasket sealing** (silicon or fiber gaskets recommended).

- **Alignment with the camshaft and lifters** (may require **hydraulic or solid lifter adjustments**).

4. **Potential for Leaks and Reliability Risks**

- **Aluminum heads can warp** if not properly torqued or cooled, leading to **leaking combustion gases**.

- **Valve spring retention** must be **double-checked** to prevent **valve float** in high-RPM applications.

- **Oil control rings and guides** may need replacement if the engine has **high oil consumption issues**.

5. **Limited Stock Availability**

- These are **not OEM parts**, so **stock availability can be inconsistent** depending on the supplier.

- Some aftermarket versions may have **quality control issues**, so **buying from reputable dealers** is crucial.

6. **Requires Supporting Modifications**

- **Tuned fueling** (ECU or standalone).

- **Proper exhaust system** (to handle increased flow).

- **Cooling system upgrades** (if pushing high power).

- **Transmission and drivetrain reinforcement** (if torque increases significantly).

---

### **Conclusion and Recommendation**

#### **Who Should Buy These Heads?**

- **High-performance Chevy enthusiasts** looking to **maximize airflow** in **LS7-based or big-block swap applications**.

- **Drag racers, street rods, or custom engine builders** who want **aerodynamic efficiency** and **durability**.

- **Forced induction builders** (supercharged or turbocharged) who need **strong valve springs and porting benefits**.

- **Those willing to invest in porting, tuning, and supporting mods** for optimal results.

#### **Who Should Avoid These Heads?**

- **Budget-conscious builders** these are **not a cheap upgrade**.

- **Beginners** without **engine assembly experience** (installation is **not a simple bolt-on**).

- **Those not willing to modify their block** (deck height, rod spacing, etc.).

- **People expecting "plug-and-play" gains** these heads **require tuning and supporting mods**.

#### **Final Recommendation**

If you are **building a high-performance LS7 engine, a big-block Chevy swap, or a forced induction application**, the **GM LS7 rectangle cylinder heads (1407088)** are a **solid choice** provided you:

**Budget for porting, tuning, and supporting mods.**

**Have experience with engine assembly or work with a trusted mechanic.**

**Ensure block compatibility (deck height, rod spacing, etc.).**

**Invest in proper gaskets, valve springs, and cooling upgrades.**

For **stock or mild street applications**, these heads **may not be necessary** a **well-ported OEM head or aftermarket small-block head** could be a **more cost-effective** solution.

If you proceed, **buy from a reputable supplier (JE, Crane, or Edelbrock)** and **have them professionally ported** for the best results. Pair them with a **high-quality ECU tune** and **supporting mods** (exhaust, intake, cooling) to unlock their full potential.

Details:

Was very impressed with communication, packing. It is exactly what the photos depicted. This is smooch better than what I have. FAQs: Is this an original OEM part or a reproduction.

They were safely packed, in fact so well even I had a hard time unwrapping the parts. When I got to it, it was surrounded with bubble wrap.I am very happy this. The way this was packaged, Iowas very impressed. There are a very few select listings where there known issues.

The box was actually made specifically for what I bought. This company would get 10 stars if possible. Hope to do business again. It was shipped in great time.

We had them inspected and they checked out, but should be freshened up. Factory high performance parts. Original Ford parts. Original GM Muscle car parts.

Hard to find Mopar Parts. There was three layers of cardboard with heavy tape. Absolute Best. If you do not see a shipping price available to you, then your home country is blocking its availability.

Have never seen this before. There was no way this could have been damaged or moved inside the box.The box fit it Perfectly. Whatever they have, I could use I m buying. First off the parts were in better condition than photos.

We had them inspected and they checked out great, but I would still recommend freshening up. The instrument gauge bezel for my 1984 Bronco ll was better than advertised.

part #: 1407088 price

• $1899.99

specifications cylinderheapar:

• for models: Ls7, 454
• for makes: Chevrolet, Chevy
• brand: Chevrolet
• mpn: 1407088
• type: Cylinder Head
• items included: Valve Springs, Retainers
• valves: Installed
• material: Cast Iron
• vintage part: Yes
• country of origin: United States

shipping cylinderheapar:

• service: USPS Ground Advantage
• class: Standard
• cost: $0.00
• transit: 10-14 Days
• carrier: USPS
• type: Fixed

general cylinderheapar:

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

seller cylinderheapar:

• # reviews: 10564
• city: Tulsa, Oklahoma
• rating: 99.8%

payments cylinderheapar:

• other
• wallet: Apple-pay
• credit card: Visa

returns cylinderheapar:

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

offer cylinderheapar:

• availability: In Stock
• sold: 0
• options: Ship-to-home
• started: April 8, 2026
• quantity: 1

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