BUICK AC177C3 Cylinder Heads 3.3/3.8 FT89 FT92 619

( Manufacturer Part Number: AC177C3 ), ( Type: Cylinder Head ), ( Oe/oem Part Number: 619 Casting ), ( Items Included: 2 Remanufactured Cylinder Heads ), ( Material: Cast Iron ), ( Country Of Origin: United States )

Review BUICK Pair Of Remanufactured 3.3/3.8 Cylinder Heads To #619

The **Buick AC177C3 cylinder heads** for the **3.3L and 3.8L V6 engines** (specifically designed for the **F-body platforms from 1989 to 1992**, including models like the Regal, Skylark, and Grand National) represent a critical and highly sought-after component for enthusiasts aiming to restore, modify, or rebuild these iconic American muscle cars. These cylinder heads are forged from high-quality **A356-T6 aluminum**, a material known for its excellent strength-to-weight ratio and superior heat dissipation properties, which were essential for maintaining performance and reliability in the high-revving, high-output applications of the era. The **619-series heads** (as indicated by the part number) feature a **pent-roof combustion chamber design**, optimized for efficient combustion and improved power delivery, particularly at higher RPM ranges where these engines excel. Each head is equipped with **four valves per cylinder** two intake and two exhaust with **1.94-inch intake valves** and **1.56-inch exhaust valves**, carefully engineered to maximize airflow and scavenging efficiency. The **pushrod-operated valve train** is complemented by **hydraulic lifters**, ensuring smooth operation and eliminating the need for frequent valve adjustments, a hallmark of Buick s engineering during this period. The **porting and contouring** of these heads are meticulously crafted to enhance airflow dynamics, with **large, smooth intake ports** that facilitate optimal fuel-air mixture entry and **well-defined exhaust ports** that promote efficient exhaust gas expulsion, both of which contribute to a more responsive throttle and better overall engine performance. Additionally, these heads are compatible with **EFI (Electronic Fuel Injection)** systems, reflecting the transition from carbureted to fuel-injected engines in the late '80s and early '90s, which allowed for more precise fuel delivery and improved emissions compliance. Whether you're restoring a classic F-body to its original glory or pushing it into the realm of high-performance modifications, these **AC177C3 cylinder heads** serve as a foundational element, offering a blend of historical authenticity and modern reliability. Their robust construction, precise machining, and timeless design make them a prized addition for anyone looking to preserve or enhance the legacy of Buick s legendary V6 engines.

Buying a set of Buick AC177C3 cylinder heads (3.3L or 3.8L, FT89/FT92, 619 series) for a performance build or restoration can be a cost-effective way to improve engine power, but it comes with both advantages and drawbacks. Below is a detailed breakdown of the pros and cons, followed by a conclusion and recommendation.

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### **Pros of Buying AC177C3 Cylinder Heads**

1. **Proven Performance Potential**

The AC177C3 heads are designed for the Buick 3.3L (V6) and 3.8L (V6) engines, which are part of the GM "3800" and "3300" families. These heads are capable of producing solid power when properly modified. With porting, valve jobbing, and the right camshaft, they can support **300 400 horsepower** in stock-block applications, making them a popular choice for street and light drag builds.

2. **Widely Available and Affordable**

These heads are among the most common aftermarket cylinder heads for GM V6 engines, meaning they are **easily found** on the used market, at swap meets, or through online marketplaces. Prices typically range from **$100 $300 per head**, depending on condition and whether they come with valves or springs. This makes them a budget-friendly option compared to newer or high-performance heads.

3. **Compatibility with Stock and Modified Engines**

- **3.3L (V6) 3300 series (FT89, FT92, etc.)**

- **3.8L (V6) 3800 series (FT92, 619, etc.)**

They work well with stock or mildly modified engines, as well as those with **performance cams, intake manifolds (e.g., Edelbrock, Holley), and fuel injection upgrades**.

4. **Modifiable for Better Flow**

- **Port matching** (matching intake and exhaust ports for better flow)

- **Valve jobbing** (new valves, valve seats, and keepers)

- **Intake valve enlargement** (commonly upgraded to **2.00" intake valves** from stock 1.75")

- **Exhaust valve enlargement** (often upgraded to **1.50" 1.60" exhaust valves**)

With these mods, airflow can be **dramatically improved**, leading to better horsepower and torque.

5. **Good for Fuel Injection Builds**

The AC177C3 heads work well with **L76, L98, or modern fuel-injected setups** (e.g., Holley, Edelbrock, or standalone ECU systems). They are not as restrictive as some older carbureted heads, making them a solid choice for **EFI conversions**.

6. **Durable Construction**

While not as robust as modern heads, the **cast iron construction** of these heads is generally reliable if maintained properly. They can handle **moderate power levels** (300 400 HP) with the right support (strengthened rods, crank, and oil system).

7. **Community Support and Tuning Resources**

- **Tuning guides** are widely available (e.g., for MSD, Edelbrock, or standalone ECUs).

- **Porting and modding tips** can be found in forums (e.g., **Buick-Ride, High-Performance Parts, or YouTube tutorials**).

- **Aftermarket parts** (valves, springs, retainers) are readily available.

---

### **Cons of Buying AC177C3 Cylinder Heads**

1. **Age and Potential Weaknesses**

- **Cast iron can crack** under extreme power or thermal stress, especially if the engine is modified aggressively.

- **Valves and valve guides** may wear out over time, leading to leaks or poor sealing.

- **Head gaskets** (if included) are often worn and may require replacement.

2. **Stock Flow Limitations**

While portable, the **stock port geometry is not optimal** for high-performance applications. Without **port matching and valve upgrades**, they will not flow as well as modern or high-performance heads (e.g., Edelbrock, Holley, or JE).

3. **Potential for Leaks and Wear**

- **Valve stem seals** can fail, causing oil leaks into the combustion chamber.

- **Head bolts** may stretch or seize over time, requiring **replacement with ARP or high-strength bolts**.

- **Exhaust ports** can develop **thermal cracks**, especially if the engine runs too hot.

4. **Requires Additional Modifications for Best Results**

- **Port matching** ($100 $300 per head)

- **Valve upgrades** (larger intake/exhaust valves, new springs)

- **Intake manifold upgrade** (Edelbrock Performer, Holley, or custom)

- **Fuel injection system** (if not already present)

- **Camshaft upgrade** (performance or high-lift)

- **Exhaust system** (to handle increased flow)

This adds **significant cost** beyond just buying the heads.

5. **Not Ideal for Extreme Power Levels**

While capable of **300 400 HP**, these heads **struggle at very high power levels** (500 HP) without **major reinforcement** (e.g., forged internals, stronger rods, and a reinforced block). For **serious drag racing or high-RPM applications**, newer or more robust heads (e.g., **Edelbrock T-Force, Holley, or JE**) may be better.

6. **Potential for Inconsistent Quality**

- **Mismatched heads** (some may have different port sizes or valve sizes).

- **Cracked or warped heads** (always inspect for cracks, warpage, or leaks).

- **Missing or worn components** (valves, springs, retainers, or seals).

7. **Limited Modern Support**

While there is a **large community**, some **modern tuning and diagnostic tools** (e.g., wideband AFRs, advanced ECU flashing) may require additional setup compared to newer heads.

---

### **Conclusion**

The **AC177C3 cylinder heads** are a **great budget-friendly option** for buyers looking to **modulate a 3.3L or 3.8L Buick V6 engine** for **street or light drag use**. They offer **solid performance potential** when properly ported and modified, and their **widespread availability** makes them an attractive choice. However, they are **not without drawbacks** they require **additional work and upgrades** to reach their full potential, and their **age means they may need extra attention** to prevent leaks or failures.

If you are **building a project car, restoring a classic Buick, or looking for a cost-effective way to add power**, these heads are a **solid choice** especially if you plan to **port them, upgrade the valves, and pair them with a good intake and fuel system**. However, if you are **targeting extreme power levels (500 HP) or need a more modern, high-flow solution**, you may want to consider **newer aftermarket heads** (e.g., Edelbrock, Holley, or JE).

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### **Recommendation**

You are working on a **3.3L or 3.8L Buick V6** and want a **budget-friendly way to add power**.

You plan to **port the heads, upgrade the valves, and pair them with a performance cam and intake**.

You are comfortable with **some additional modifications** (e.g., new valves, springs, head gaskets, and possibly ARP bolts).

You want **street or light drag performance** (300 400 HP range).

You need **extreme power levels** (500 HP) without major engine reinforcement.

You want a **plug-and-play solution** with minimal modifications.

You prefer **newer, more durable heads** with better modern support.

You are **not willing to invest time in porting and valve upgrades**.

For the right buyer, the **AC177C3 heads are a fantastic value** they can **transform a stock or mildly modified 3.3L/3.8L Buick V6 into a solid performer** without breaking the bank. Just be prepared for **some extra work** to get them running at their best. If you re serious about the build, **inspect them thoroughly for cracks, warpage, and leaks**, and **budget for porting and valve upgrades** to maximize

Details:

All heads are vacuum tested to ensure proper valve seating.FREE SHIPPING inside the continental USA only. All bolt holes are retreaded and repaired as needed. 1989 1992 Buick Skylark. PAIR of completely remanufactured cylinder heads.

FREESHIPPING inside the USA. Year Make model. All heads are or tested and guaranteed robe free from casting defects. 1989 1992 Buick Century.

Parts are inspected and refurbished to like new if within.e specification. ## Casting #619 GM 3.3L / 3.8L V6, 1988 1992. New parts are installed as needed. All seats and surface are re-machined within.e.specifications.

1989 1992 Buick Le Sabre.

part #: ac177c3 price

• $375.00

specifications cylinderheapar:

• for makes: Buick
• mpn: Ac177c3
• type: Cylinder Head
• oe/oem part number: 619 Casting
• items included: 2 Remanufactured Cylinder Heads
• material: Cast Iron
• country of origin: United States

seller cylinderheapar:

• rating: 100.0%
• city: Oakland, California
• # reviews: 12

payments cylinderheapar:

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

shipping cylinderheapar:

• type: Calculated
• cost: $0.00
• class: Standard
• service: USPS Ground Advantage
• carrier: USPS
• transit: 5-11 Days

returns cylinderheapar:

• policy: No Returns

general cylinderheapar:

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

offer cylinderheapar:

• availability: In Stock
• quantity: 4
• started: April 9, 2026
• options: Ship-to-home
• best offers: True
• sold: 0

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