BUICK 306-01556 Cylinder Head 6-231 38L

( Model: REGAL ), ( Part Type: Cylinder Head ), ( Conditions Options: Inj, 3.8 ), ( Genuine Oem: Yes ), ( Ipn: 306-01556 ), ( Partout Id: A-111842518 )

Review BUICK Cylinder Head 38l fits REGAL BONNEVILLE 1993–1995

The **Buick 306-01556 Cylinder Head** is a precision-engineered component designed specifically for the **1993-1995 Buick Bonneville** equipped with the **3800 (3.8L) V6 engine**, corresponding to the **6-231** engine family. This high-performance cylinder head is crafted from durable cast iron, ensuring robust durability and resistance to thermal stress under high-performance driving conditions. The head features a **four-valve-per-cylinder design**, allowing for improved airflow and enhanced combustion efficiency, which translates to better throttle response, increased horsepower, and smoother operation. The **intake and exhaust ports** are meticulously machined to optimize fuel mixture and exhaust expulsion, contributing to a more responsive and efficient engine. The head is equipped with **pushrod-actuated valves**, operated by a **rocker arm system**, ensuring reliable valve movement and minimizing wear over extended use. Additionally, this component includes **integrated spark plug bosses** and **valve cover mounting points**, providing a secure and leak-free installation. Designed to meet or exceed OEM specifications, this cylinder head is compatible with the **2073** engine control system, ensuring proper calibration and performance integration. Whether used for restoration, performance tuning, or replacement due to wear, this Buick cylinder head delivers the reliability and power expected from a classic American muscle car, making it an essential part for maintaining or upgrading the iconic Bonneville s engine bay.

### **Pros and Cons of Buying a Buick 306-01556 Cylinder Head (6-231 38L 93-95 Bonneville 2073)**

1. **Performance Improvement** A rebuilt or restored cylinder head can significantly improve engine performance, including better horsepower, torque, and fuel efficiency. The 6-231 38L V6 was a solid engine in its day, and a properly overhauled head ensures optimal airflow and combustion.

2. **Reliability Boost** Over time, cylinder heads develop wear, cracks, or warping, leading to leaks, misfires, or catastrophic failure. Replacing or restoring the head prevents these issues, extending the engine s lifespan.

3. **Prevents Costly Repairs** Ignoring head wear can lead to more expensive problems, such as valve seat failure, cracked combustion chambers, or even a blown head gasket. Addressing the head now avoids larger bills later.

4. **Compatibility with Modifications** If you plan to upgrade your engine (e.g., forced induction, camshaft swaps, or performance tuning), a fresh cylinder head is essential for handling increased stress.

5. **Resale Value Preservation** A well-maintained engine with a restored head keeps the vehicle in better condition, making it more attractive to potential buyers if you decide to sell later.

6. **Easier to Source Parts** Since the Bonneville was a popular Buick, finding replacement parts (valves, springs, seals, etc.) is relatively straightforward compared to rarer models.

7. **Potential for DIY or Professional Installation** While cylinder head work can be labor-intensive, many mechanics charge reasonable rates for this job, and some buyers may attempt it themselves with the right tools and experience.

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1. **Cost** A new or rebuilt cylinder head for this engine can be expensive, especially if sourced from a reputable supplier. Prices vary, but expect to pay anywhere from **$300 to $800 **, depending on whether it s a direct replacement, a rebuilt unit, or a high-performance aftermarket head.

2. **Labor Intensity** Removing and reinstalling a cylinder head requires disassembling the engine, which is a major undertaking. This may involve removing the intake manifold, exhaust headers, valve cover, and other components. If you re not experienced, this could take **10 20 hours** of labor.

3. **Potential for Hidden Issues** Even if the head itself is in good condition, other engine components (e.g., pistons, rods, crankshaft) may be worn and require replacement. A full engine rebuild might be necessary, increasing costs.

4. **Finding a Quality Head** Not all cylinder heads are created equal. A poorly rebuilt or low-quality aftermarket head could lead to future problems like leaks, poor sealing, or premature failure. Researching suppliers and checking reviews is crucial.

5. **Time and Downtime** The process of removing, inspecting, machining (if needed), and reinstalling the head means your vehicle will be out of commission for **a few days to a week**, depending on your skill level and available help.

- Valve springs, retainers, and seals

- Head gasket (if replacing)

- New bolts (stud or regular)

- Machining (if the head is warped or needs porting)

- Engine gasket set (if rebuilding the engine)

- Professional labor (if not DIY)

7. **Risk of Overkill** If the rest of the engine is in poor condition, replacing just the head may not be enough. You might end up needing a full rebuild, making the investment less cost-effective.

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### **Conclusion**

Replacing or restoring the **Buick 306-01556 cylinder head** on your **1993 1995 Bonneville 6-231 38L V6** is a **highly recommended** step if you re experiencing performance issues, misfires, or signs of wear (e.g., oil leaks, rough idle, or exhaust smoke). The long-term benefits in terms of **reliability, power, and engine longevity** outweigh the short-term costs and effort.

However, this is **not a minor repair** it requires careful planning, budgeting, and either mechanical skill or access to a trusted professional. If your engine is otherwise in good shape, this upgrade will pay dividends. If the rest of the engine is worn, consider a **full rebuild** to avoid repeated expenses.

1. **Diagnose First** Before purchasing a head, confirm that the issue is indeed the cylinder head (e.g., compression test, leak-down test, or visual inspection for cracks/warping).

2. **Choose Wisely**

- If the head is **minorly worn**, a **rebuilt OEM head** (from a reputable supplier like **Buick Specialty Parts, Summit Racing, or eBay Motors**) is a solid choice.

- If you want **performance gains**, consider a **high-flow aftermarket head** (e.g., **JE, Edelbrock, or Holley**), but ensure compatibility with your engine s other components.

- If the head is **cracked or severely worn**, a **new or machined OEM head** is the safest option.

3. **Budget Accordingly** Account for **parts, labor (if outsourcing), and potential additional repairs** (e.g., new valves, seals, or gaskets).

4. **DIY or Professional?**

- If you have **mechanical experience**, this can be a rewarding project.

- If not, **hire a reputable machine shop or Buick specialist** to ensure proper machining, sealing, and installation.

5. **Consider a Full Engine Refresh** If the engine has **high mileage or signs of wear**, pairing the head replacement with a **valve job, new gaskets, and a tune-up** will maximize results.

**Final Verdict:** **Worth it if done correctly.** A fresh cylinder head will **restore power, prevent future failures, and extend your engine s life** making it a smart investment for any Bonneville owner looking to keep their vehicle running strong. Just ensure you **plan carefully, source quality parts, and don t rush the process.**

Details:

That is not the way this system was designed. Visual flaws still may be present as the item is used. Oversize charges are implemented for items over using the same formula and if its 130 an $100.00 charge is applied. We prefer it, its faster and it provides a written record for your protection ours.

Buyers must be willing to answer their calls and discuss the delivery of item with carrier. Are NOT included with this listing. Not allowing an item to be delivered is the same as refusing it. If an RMA# is not provided there may be a delay in processing the return.

This system was designed as a benchmark with certain understandings. Specific item information and warranty is posted on the listing. We ask that you verify the actual condition versus what are expecting to prevent any issues later. A telephone number is required.

A Home-based business, or a farm, do not qualify as business/commercial address for logistical purposes. As well charges are based on dimensional weight, not actual weight. The pre-installation maintenance items are as follows: Drain and replace engine oils to manufacturers suggested levels. Residential Limited Access fees range from $50-$100.

Orders placed after 10:00 am CST cannot be guaranteed shipping that day if option applies to your listing. A business/commercial delivery address is required for the stated shipping price. Lift gate Fees range from $50-$100. Please verify identification numbers, wheelbase measurements, and ID codes.

A condition does not mean new or perfect it means the item is in great used. Common used part visual blemishes most likely present. The difficulty as you can see is placing exact charges on each listing when so many variables are present. Essentially this means that the item may be in better or worse condition than stated.

Replace Oil Filter, Valve Cover Gaskets, Pan Gasket Rear Main Seal, Inspect and replace, if needed, timing gears, chains or belts gaskets, thermostat gasket, Flush cooling system refill with antifreeze to appropriate level, Install New Spark Plugs, Belts Hoses. Most carriers do not allow hand unloading. This may vary during heavy traffic time periods and buyers would be notified of any anticipated delay. They are not reflective of the actual part or condition being sold.

part #: regal prices

• $126.67-$277.69

specifications cylinderheapar:

• for models: Regal, Bonneville
• for makes: Buick
• for years: 1993-1995
• model: Regal
• part type: Cylinder Head
• conditions options: Inj, 3.8
• genuine oem: Yes
• ipn: 306-01556
• partout id: A-111842518

payments cylinderheapar:

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

returns cylinderheapar:

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

offer cylinderheapar:

• best offers: True
• availability: In Stock
• started: February 11, 2026
• sold: 0
• quantity: 1
• options: Ship-to-home

shipping cylinderheapar:

• service: FedEx Ground / FedEx Home Delivery
• carrier: FedEx
• type: Calculated
• transit: 3-8 Days
• class: Standard
• cost: $107.49

general cylinderheapar:

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

seller cylinderheapar:

• city: Arena, Wisconsin
• # reviews: 9611
• rating: 99.9%

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