BUICK 24500363 Ave Ultra Rear Cylinder Head Supercharged 3.8L

( Manufacturer Part Number: 24500363 ), ( Part Type: Cylinder Head ), ( Id: E4d0e5f9-9d56-452d-972c-3106483bf359 ), ( Interchange: 306-1501 )

Review BUICK Ave Ultra Rear Cylinder Head Assembly Oem 3.8l Supercharged fits PARK 1991–1992

The **Buick 24500363 1991-1992 Park Avenue Ultra 3.8L Supercharged Rear Cylinder Head** is a meticulously crafted, high-performance component designed to elevate the already formidable power and refinement of General Motors legendary **L38 supercharged V6 engine**. This cylinder head, part of the **24500363** assembly line, represents the pinnacle of Buick s engineering for the **Park Avenue Ultra**, a model synonymous with luxury, precision, and exhilarating acceleration. Engineered for the **1991 and 1992 model years**, this head is built to withstand the intense pressures generated by the **EFI (Electronic Fuel Injection) system** and the **positive displacement supercharger**, which boosts the naturally aspirated 3.8L V6 to produce a staggering **225 horsepower** a figure that was groundbreaking for its time. Crafted from **high-grade cast iron**, the head features **five-valve-per-cylinder architecture**, with **intake and exhaust valves** precisely machined for optimal airflow, ensuring peak combustion efficiency and reduced heat buildup. The **supercharger-driven induction system** forces ambient air into the combustion chambers at elevated pressures, demanding a head that can manage the increased heat and stress without compromising durability. The **valve springs, retainers, and keepers** are designed to maintain tight valve closure under boost, while the **combustion chamber design** is optimized for efficient fuel-air mixture ignition, minimizing detonation and maximizing torque delivery. This cylinder head also incorporates **modern sealing technologies**, including **high-temperature silicone gaskets**, to prevent leaks and maintain vacuum integrity, which is critical for the proper functioning of the **EFI system** and **supercharger bypass valve**. Whether restoring a classic Park Avenue Ultra to its former glory or upgrading an existing engine for enhanced performance, this **24500363 cylinder head** is a critical component that ensures reliability, responsiveness, and the signature **buzz of the supercharged L38** a sound that has become iconic among enthusiasts and collectors alike. Perfect for those seeking to preserve or revive the spirit of Buick s most exhilarating V6, this part is a testament to the brand s commitment to blending power with elegance in the late 1980s and early 1990s.

### Pros and Cons of Buying a 1991-1992 Buick Park Avenue Ultra with a 3.8L Supercharged V6 (Rear Cylinder Head, Part Number 24500363)

1. **Supercharged Performance** The 3.8L V6 with a rear cylinder head and supercharger produces strong power, making it more engaging than naturally aspirated engines of the era. This setup is particularly well-regarded for its torque, which translates to better acceleration and towing capability compared to standard Buicks of the time.

2. **Reliability of the 3.8L V6** The 3.8L Buick V6 (especially the rear cylinder head variant) is known for being a durable engine when properly maintained. With regular oil changes and attention to the supercharger s cooling system, it can last well over 200,000 miles.

3. **Classic Buick Comfort and Luxury** The Park Avenue Ultra was Buick s flagship sedan, offering high-end features like leather upholstery, power everything, and a spacious, well-appointed interior. The ride quality and sound insulation were excellent for its time, making it a comfortable long-distance cruiser.

4. **Supercharger as a Mod Potential** The supercharger can be upgraded or rebuilt, allowing for increased power output if the engine is in good condition. This makes the car more customizable than a naturally aspirated Buick.

5. **Niche Appeal** Supercharged Buicks are less common than their naturally aspirated counterparts, which can make them more desirable to collectors and enthusiasts. This could lead to better resale value among enthusiasts.

6. **Good Handling for a Full-Size Sedan** The Park Avenue Ultra had a relatively nimble handling setup for its size, thanks to Buick s engineering focus on ride comfort without sacrificing stability.

7. **Availability of Parts** While not as widely available as modern parts, the 3.8L V6 and its components (especially the rear cylinder head version) still have a decent aftermarket presence. Supercharger rebuild kits and gaskets are relatively easy to find.

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1. **Supercharger Maintenance** The supercharger adds complexity to the engine. It requires regular belt tension checks, cooling system maintenance (intercooler, radiator, and oil cooler), and occasional rebuilds. Neglecting these can lead to overheating, oil starvation, or catastrophic failure.

2. **Fuel Economy** The supercharger significantly reduces fuel efficiency compared to a naturally aspirated 3.8L. Expect around **14-16 MPG city** and **20-22 MPG highway**, which is poor by modern standards and even for the early '90s.

3. **Rust Concerns** Like many vehicles from the early '90s, the Park Avenue Ultra is prone to rust, particularly in the wheel wells, rocker panels, and undercarriage. A thorough inspection is critical to avoid hidden corrosion issues.

4. **Transmission Reliability** The 3.8L supercharged models were often paired with the **THM-250C 4-speed automatic**, which is known for being less durable than later Buick transmissions. Symptoms of failure include rough shifting, delayed engagement, or complete transmission lockup.

5. **Electrical and Computer Issues** Early '90s Buicks had rudimentary electronic systems that can fail over time. The **EEC-IV engine management system** may require recalibration or replacement sensors, and the **anti-lock braking system (ABS)** can be finicky.

6. **Supercharger Noise and Vibration** The supercharger can produce noticeable whine and vibration, especially at higher RPMs. This may not bother some owners but could be annoying to others.

7. **High Maintenance Costs** While the engine itself is durable, the supercharger and associated components (like the oil cooler and intercooler) require specialized attention. Labor costs for rebuilding the supercharger or addressing cooling system issues can add up.

8. **Limited Modern Upgrades** Unlike modern vehicles, the Park Avenue Ultra lacks OBD-II diagnostics, making troubleshooting harder. Many modern performance parts (e.g., high-flow fuel injectors, upgraded wiring) are not directly compatible without modifications.

9. **Depreciation** Classic Buicks, even desirable ones like the Park Avenue Ultra, do not hold value like muscle cars or Japanese imports. The market for them is niche, and resale value is generally low unless it s a well-preserved collector s model.

10. **Driving Experience Limitations** While the supercharger makes the car feel more powerful, it does not offer the same level of precision or modern driving dynamics as contemporary vehicles. The ride is plush but not sporty.

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### **Conclusion and Recommendation**

The **1991-1992 Buick Park Avenue Ultra with a 3.8L supercharged V6 (rear cylinder head)** is a unique and fun-to-drive classic, but it is not a "set-and-forget" purchase. It appeals to buyers who appreciate **luxury, power, and a touch of nostalgia** but are willing to invest time and money in maintenance particularly the supercharger and cooling systems.

#### **Who Should Buy It?**

- **Enthusiasts who enjoy working on engines** and are comfortable with supercharger maintenance.

- **Those who prioritize comfort and vintage luxury** over modern efficiency or performance.

- **Owners who plan to keep the car for the long term** and are okay with occasional repairs.

- **People who want a rare, supercharged Buick** for weekend cruising or classic car shows.

#### **Who Should Avoid It?**

- **Buyers who want a low-maintenance, high-mileage daily driver.**

- **Those who prioritize fuel efficiency or modern technology.**

- **People without mechanical experience** who are not prepared for supercharger rebuilds or transmission issues.

- **Investors looking for strong resale value** this is not a car that appreciates like a well-maintained muscle car or exotic.

If you find a **well-documented example** with **low miles (under 100,000), no major rust, and a supercharger that has been recently rebuilt or inspected**, it can be a fantastic project or hobby car. However, **budget for at least $3,000 $5,000 in repairs** within the first year, including:

- Supercharger rebuild or inspection

- Transmission fluid and filter change

- Cooling system flush (radiator, intercooler, oil cooler)

- Suspension and bushings (if worn)

- Rust repairs (if present)

If you re buying it **primarily for driving pleasure and not as a daily**, it s a great choice. If you re looking for a reliable, low-cost classic, consider a **naturally aspirated 3.8L Buick** or a different model entirely.

**Verdict:** Buy it **only if you re prepared for maintenance and enjoy the challenge** otherwise, look elsewhere.

Details:

Search for more parts BUICK PARK AVE. BUICK PARK AVENUE 80 UP 92 6-231, 3.8L.

part #: 24500363 prices

• $156.59-$427.50

specifications cylinderheapar:

• for models: Park
• for makes: Buick
• for years: 1991-1992
• mpn: 24500363
• part type: Cylinder Head
• id: E4d0e5f9-9d56-452d-972c-3106483bf359
• interchange: 306-1501

payments cylinderheapar:

• wallet: Paypal
• credit card: Discover
• other

seller cylinderheapar:

• rating: 99.3%
• city: Brush, Colorado
• # reviews: 14288

offer cylinderheapar:

• quantity: 1
• availability: In Stock
• started: February 12, 2026
• best offers: True
• sold: 0
• options: Ship-to-home

returns cylinderheapar:

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

general cylinderheapar:

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

shipping cylinderheapar:

• transit: 5-8 Days
• type: Fixed
• class: Standard
• cost: $0.00
• service: Standard

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