1. Cylinder Heads & Parts Engines Components For Sale
  2. sku: 11645873174620723
  3. CHEVROLET LS1511ML

CHEVROLET LS1511ML Gm Cylinder Heads Steel Angle Race 243 2.00/1.60 .625

fits make: Chevrolet.

Ls1511ml Chevrolet Gm 243 Cylinder Heads 2.00/1.60 Stainless Steel .625 Psi 5 Angle Race

( Manufacturer Part Number: LS1511ML ), ( Valve Guides: New Oem Style Iron ), ( Valve Seals: Texas Sspeed Viton ), ( Custom Bundle: Yes ), ( Items Included: See Package ), ( Core Charge: Return Fore For Extended Warranty Only ), ( Build Package: 5 Angle Race Street Turbo ), ( Manufacturer Warranty: 6 Month ), ( Finish: Aluminum ), ( Fitment Type: Direct Replacement ), ( Vintage Part: No ), ( Bore Size: 3.890 ), ( Type: Cylinder Head ), ( Spring Seats: Texas Speed Viton Vkm Tophat Style ), ( Oe/oem Part Number: 12564243 ), ( Exhaust Valves: Stainless Steel 1.60 ), ( Retainers: Oem Steel Retainers ), ( Compression Mill: .010 ), ( Valve Springs: .625 Lift Psi Brand P/n Ls1511ml ), ( Country Of Origin: United States ), ( Item Weight: 50 Lb ), ( Intake Valves: Stainless Steel 2.00 )

Review CHEVROLET Gm 243 Cylinder Heads 2.00/1.60 Stainless Steel .625 Psi Angle Race

The **Chevrolet LS1511ML GM 243 Cylinder Heads (2.00/1.60 Steel, 625 Angle Race)** are a high-performance, precision-engineered component designed exclusively for enthusiasts seeking maximum power, reliability, and durability in their small-block Chevrolet engines. These cylinder heads are meticulously crafted from **high-grade steel**, featuring a robust **243-degree combustion chamber design** optimized for aggressive camshaft profiles and high-revving applications. The **2.00/1.60 ratio** refers to the precise valve-to-chamber geometry, striking an ideal balance between airflow efficiency and mechanical strength, making them well-suited for forced induction setups, nitrous oxide applications, or high-lift camshaft installations. The **625 angle** of the intake and exhaust valves ensures optimal port velocity and scavenge efficiency, reducing backpressure and maximizing horsepower potential. Built to withstand extreme stress, these heads incorporate **race-proven construction**, including reinforced valve guides, hardened valve seats, and precision-machined ports that enhance volumetric efficiency. Whether paired with a **supercharger, turbocharger, or nitrous system**, these cylinder heads deliver exceptional performance while maintaining structural integrity under heavy loads. Ideal for **drag racing, street rod builds, or high-performance street applications**, they are a must-have upgrade for those pushing their engines to the limit. Backed by GM s legacy of engineering excellence, these cylinder heads represent a blend of heritage and cutting-edge performance, ensuring they meet the demands of even the most ambitious engine builders.

The Chevrolet LS1511ML GM 243 cylinder heads (2.00/1.60 steel, 625 angle race) are a popular choice among performance enthusiasts for LS-based 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 LS1511ML GM 243 Cylinder Heads**

1. **Proven Performance and Reliability**

These heads are a direct port version of the factory LS1 heads, meaning they retain the same durability and strength as the stock components but with improved airflow. They are widely used in racing and high-performance street applications, with a strong track record of reliability when properly maintained.

2. **Improved Airflow and Horsepower**

The 2.00/1.60 porting (2.00-inch intake port, 1.60-inch exhaust port) offers a significant airflow increase over stock heads, typically resulting in **10-20% more horsepower** depending on the engine setup. The 625-degree valve angle is optimized for high RPM performance, making these heads well-suited for forced induction (turbo/supercharger) and naturally aspirated high-RPM applications.

3. **Compatibility with Stock LS Engines**

These heads are a direct bolt-on replacement for stock LS1, LS2, and LS3 engines (with minor modifications like port matching or valve spring upgrades). They work seamlessly with stock crankshafts, pistons, and connecting rods, reducing the need for extensive engine rebuilds.

4. **Durability and Strength**

The **steel construction** ensures they can handle high cylinder pressures, making them ideal for forced induction builds. The **625-degree valve angle** (compared to stock s 570 degrees) improves valve clearance and reduces the risk of valve float at high RPMs.

5. **Aftermarket Support and Availability**

These heads are widely available from reputable manufacturers like **JE (JE Performance), Edelbrock, and others**, ensuring easy access to parts, gaskets, springs, and retainers. There is also a wealth of tuning and porting guides available for optimization.

6. **Cost-Effective Upgrade**

Compared to full engine swaps or custom heads, these are a relatively affordable way to significantly increase power. Pricing typically ranges from **$800 $1,500 for a pair**, depending on the source and included components (e.g., valves, springs, or porting).

7. **Versatility for Tuning**

They perform well across a range of applications:

- **Naturally aspirated (NA) high-RPM builds** (e.g., 7,000 RPM)

- **Turbocharged/supercharged setups** (with proper cooling and support)

- **Nitrous oxide (N2O) applications** (with reinforced internals)

8. **Easy Installation**

Since they are a direct replacement, installation is straightforward for those with basic mechanical skills. Most shops can install them in a day, and they require minimal additional modifications (e.g., valve spring upgrades for high RPM).

---

### **Cons of the LS1511ML GM 243 Cylinder Heads**

1. **Not a "Drop-In" Solution for All Engines**

While they bolt onto stock LS engines, some modifications may still be required:

- **Valvetrain upgrades** (e.g., stiffer springs, retainers, and keepers) are often necessary to prevent valve float at high RPMs.

- **Port matching** may be needed if using a non-stock crankshaft or pistons to ensure proper clearance.

- **Fuel and ignition upgrades** are critical to avoid detonation with the increased airflow.

2. **Limited Stock Valve Springs**

The stock valve springs may not be sufficient for high-RPM applications (especially with forced induction). Upgraded springs (e.g., **JE or Edelbrock performance springs**) are recommended, adding to the cost.

3. **Potential for Overheating**

The increased airflow and power output can lead to higher operating temperatures. Adequate **cooling (radiator, oil cooler, intercooler if turbocharged)** is essential to prevent overheating and ensure longevity.

4. **Requires Proper Tuning**

These heads perform best when paired with a **standalone ECU or tuner** (e.g., Haltech, Link, or AEM) to optimize fuel delivery, ignition timing, and boost (if applicable). Stock ECUs may not handle the increased power safely.

5. **Wear and Maintenance Considerations**

- **Valve guides and seats** may wear faster under high loads, requiring periodic inspection and replacement.

- **Head gasket failure** can occur if the heads are not properly torqued or if the engine runs too hot.

- **Oil control rings** may need upgrading if running high boost (common in turbocharged applications).

6. **Not Ideal for Low-RPM Torque**

While these heads excel at high RPM, they are less optimized for **low-end torque**. If your application prioritizes torque at lower RPMs (e.g., drag racing or heavy-duty towing), other heads (e.g., **LS7 or custom ported heads**) may be better suited.

7. **Potential for Valve Float**

Without proper valvetrain upgrades, valve float can occur at very high RPMs, reducing efficiency. This is more of an issue in turbocharged or nitrous applications.

8. **Limited Customization**

While these heads are ported for better airflow, they are not as aggressively ported as **full custom heads** (e.g., from **JE or Edelbrock s extreme porting kits**). For extreme builds, custom porting may be necessary.

---

### **Conclusion**

The **LS1511ML GM 243 cylinder heads** are an excellent choice for LS-based engines looking to significantly increase power while maintaining reliability. They strike a balance between **performance gains, durability, and cost-effectiveness**, making them ideal for:

- **Naturally aspirated high-RPM builds** (e.g., 7,000 RPM)

- **Turbocharged or supercharged applications** (with proper support)

- **Racing and high-performance street applications**

However, they are **not a "set-and-forget" solution**. Proper **valvetrain upgrades, cooling, and tuning** are essential to unlock their full potential and prevent failure. They are best suited for enthusiasts who are willing to invest in supporting modifications rather than those looking for a simple bolt-on power increase.

---

### **Recommendation**

**Buy these heads if:**

- You are running a **stock or mildly modified LS engine** and want a **proven, high-performance upgrade**.

- Your application involves **high RPMs** (e.g., drag racing, high-revving NA builds, or turbocharged setups).

- You are willing to **invest in supporting modifications** (valvetrain, cooling, tuning).

- You prefer a **direct bolt-on solution** with minimal engine modifications.

**Avoid these heads if:**

- Your priority is **low-end torque** (consider LS7 heads or custom porting).

- You are running a **high-boost turbo setup without proper cooling or valvetrain upgrades**.

- You want a **fully custom, extreme porting solution** (e.g., for extreme power levels).

- You are on a **tight budget** and cannot afford additional valvetrain or cooling upgrades.

**Final Verdict:**

For most **LS-based high-performance builds**, the **LS1511ML GM 243 heads** are an **excellent choice** when paired with the right supporting components. They offer a **proven power increase with reliability**, making them one of the best aftermarket options for LS engines. However, **do not skimp on valvetrain upgrades, cooling, or tuning** these are critical to their success. If you are serious about maximizing power, treat them as a **starting point** rather than a complete solution.

Details:

Our heads are never painted on gasket sealing surfaced, Do not fall for shot blasted. This set of 243 have been built with our STREET TURBO performance package. This limited warranty dose not cover shipping expense. Valve locks are inspected for fit and wear replaced as necessary.

VALVE SEAT CUT: 5 angle 45 deg Performance intake seat cut exhaust NOTE DUE TO THROAT SIZING SOME BOTTOM ANGLES MAY NOT BE PRESENT, New OEM Iron valve guides as needed not Chinese, 2 YEAR WARRANTY WITH CORE RETURN. Cylinder heads are then resurfaced to correct finish for composite or MLS gasket per application. This pair are not shot blast/spray paint rebuild. Some of our heads are Painted NOT this set but never blasted.

Use of the product with other third-party product which fail. If you want inexpensive resealed belt resurfaced and painted this is NOT the pair for. Which fails due to a defect in materials or workmanship as long the product is used normally and accordance with purposes it was designed for. If you want low buck washed sprayed, new seals rebuild this is NOT the pair for you, Standard machining in addition to stated above includes, Heads one 243 castings with cosmetic defects thoroughly cleaned and inspected.

Valve retainers inspected for fit and wear, replaced as necessary. Defects do not affect seal, performance or longevity. A eligible vehicle is a that originally equipped with the same part number casting and of purchased. All pictures will supersize when ed on.

This limited warranty does not cover incidental, consequential, indirect, or special damages. Overheating, Lose of overheat tab, Modification or replacement heat tab. After machining and assembly all valves are vacuum tested to verify sealing. Discount includes free domestic USA lower 48 state ground shipping.

Valves are tumble polished measured, replaced as necessary before being face cut and tip. This Limited Warranty is valid ONLY if you are the original purchaser of product and may not be transferred. Valve seats are replaced as necessary. Flood, chemical fallout, salt, hail, or other environment conditions including natural disasters.

Intake and exhaust surfaces are chemically cleaned of paint not blasted, NEVER Chinese parts. Valve seats are inspected, crack checked and measured for wear replaced as necessary with aftermarket. A copy of warranty is posted below. All parts are thoroughly cleaned, inspected and replaced as necessary before assembly.

Improper use, installation, maintenance, or service. Pressure tested. Any disassembly beyond what is needed. On pictures to see supersized detailed of the actual cylinder heads that you purchase.

Cosmetic defects include Pitting scuffs and scratches, Thread repair/ time Sett solid insert, crack repair, welding as needed normally found on a used core that has been rebuilt. Wear, broken bolts, springs, or burnt valves are all OK. So don't be fooled with stock photos or low-resolution hiding defects and poor machining. Valve guides are cleaned and measured.

This pair of cylinder heads has our same warranty as non-defect. Abuse, misuse, disassembly, modification, or neglect of the product. Contact me for discount pricing with sale of any pair cylinder heads. Broken valve, broken guide or fire damage must be approved in advance, Other Issues such as burnt bent valves, warped deck, springs, stuck guides are all OK.

Shot / media basting is not the correct surface finish for Factory LS intake gaskets or MLS exhaust. Don't BE TAKEN BY paint covered damage to intake and exhaust flange. Available in many aftermarket valve sizes also. Failures due to a defect in materials or workmanship as long the product is used normally and accordance with purposes it was designed for.

See details below, These are not cheap sand blasted spray paint rebuild. Core return must be fully assembled with all parts. See pictures. Guide work performed / replaced with new guides as necessary to oem guide valve stem specifications.

part #: ls1511ml price

  • $1000.00

specifications cylinderheapar:

  • for makes: Chevrolet
  • mpn: Ls1511ml
  • valve guides: New Oem Style Iron
  • valve seals: Texas Sspeed Viton
  • custom bundle: Yes
  • items included: See Package
  • core charge: Return Fore For Extended Warranty Only
  • build package: 5 Angle Race Street Turbo
  • manufacturer warranty: 6 Month
  • finish: Aluminum
  • fitment type: Direct Replacement
  • vintage part: No
  • bore size: 3.890
  • type: Cylinder Head
  • spring seats: Texas Speed Viton Vkm Tophat Style
  • oe/oem part number: 12564243
  • exhaust valves: Stainless Steel 1.60
  • retainers: Oem Steel Retainers
  • compression mill: .010
  • valve springs: .625 Lift Psi Brand P/n Ls1511ml
  • country of origin: United States
  • item weight: 50 Lb
  • intake valves: Stainless Steel 2.00

payments cylinderheapar:

  • wallet: Apple-pay
  • credit card: Discover
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shipping cylinderheapar:

  • service: Economy with Adult Signature required
  • type: Fixed
  • class: Economy
  • transit: 4-11 Days
  • cost: $0.00

returns cylinderheapar:

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

general cylinderheapar:

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

seller cylinderheapar:

  • # reviews: 634
  • city: Tehachapi, California
  • rating: 100.0%

offer cylinderheapar:

  • quantity: 1
  • sold: 0
  • best offers: True
  • options: Ship-to-home
  • availability: In Stock
  • started: March 2, 2026
for makes: chevrolet, valve guides: new oem style iron, valve seals: texas sspeed viton, custom bundle: yes, items included: see package, core charge: return fore for extended warranty only, build package: 5 angle race street turbo, manufacturer warranty: 6 month, finish: aluminum, fitment type: direct replacement, vintage part: no, bore size: 3.890, type: cylinder head, spring seats: texas speed viton vkm tophat style, oe/oem part number: 12564243, exhaust valves: stainless steel 1.60, retainers: oem steel retainers, compression mill: .010, valve springs: .625 lift psi brand p/n ls1511ml, country of origin: united states, item weight: 50 lb, intake valves: stainless steel 2.00,
category: auto parts > car truck parts accessories > engines engine parts > cylinder heads, sku: 11645873174620723,
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1 offer $1000.00 USD
  • Remanufactured. Offer #1 priced at $1000.00 + $76.11 shipping estimate = $1076.11* total. Does not include rocker arm assemblies. Chevrolet 5.3L 1999-2007 Remanufactured Cylinder Heads.+$76.11 shipping

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