AC DELCO OLX-ACD12558840-CL360A84 Engine Cylinder Head Bolt 198995106798 Acdelco Pack

( Brand: Ac Delco ), ( Manufacturer Part Number: OLX-ACD12558840-CL360A84 ), ( Type: Automotive ), ( Material: Steel ), ( Item Weight: 0.2500 ), ( Fitment Type: Direct Replacement ), ( Generic Keywords 1: Part ), ( Intended Use: Automobiles ), ( Misc Fitment Notes: See Notes ), ( Manufacturer Warranty: 1 Year ), ( UPC: 198995106798 )

Review AC DELCO Genuine Acdelco Pontiac Engine Cylinder Head Bolt Pack Of fits GTO 2004–2006

The **AC Delco OEM Cylinder Head Bolt Pack (Part Number OLX-ACD12558840, CL360A84)** is a meticulously engineered, high-performance replacement component designed exclusively for the **2004 2006 Pontiac GTO**, ensuring precise fitment and optimal engine performance. Engineered to General Motors original equipment specifications, this bolt set is crafted from **high-strength, heat-treated steel**, delivering superior durability and resistance to fatigue, warping, and loosening under the extreme pressures and temperatures encountered in high-performance applications. Each bolt in this pack is **precision-machined** to exacting tolerances, featuring a **fine-thread design** and **torque-to-yield characteristics** that prevent overtightening while maintaining a secure, leak-proof seal between the cylinder head and engine block. The bolts are **coated with a corrosion-resistant finish**, safeguarding them against rust and degradation over time, even in demanding driving conditions or when exposed to moisture. This bolt pack is an **essential upgrade** for any GTO owner seeking to restore factory reliability, enhance engine longevity, or prepare the vehicle for performance modifications, such as forced induction or high-output camshaft installations. Whether replacing worn bolts during routine maintenance or addressing a head gasket failure, this **direct-fit OEM replacement** ensures a seamless rebuild with confidence, eliminating the risk of misalignment or improper clamping force that could lead to costly internal engine damage. Backed by **AC Delco s reputation for quality and compatibility**, this bolt pack is the ideal choice for mechanics and enthusiasts who demand nothing less than genuine performance and longevity from their Pontiac GTO s critical engine components.

### Pros and Cons of buying a AC Delco OLX-ACD12558840-CL360A84 Cylinder Head Bolt Pack for a 2004-2006 Pontiac GTO

1. **OEM Quality and Fitment** AC Delco is a trusted brand that produces parts designed to meet or exceed General Motors original equipment specifications. This ensures compatibility with your 2004-2006 Pontiac GTO s LS engine, reducing the risk of improper fitment or premature failure.

2. **Reliability and Durability** These bolts are manufactured to withstand the high clamping loads and thermal cycling of cylinder heads, reducing the likelihood of loosening or stripping over time. High-quality materials help prevent warping or deformation under stress.

3. **Ease of Installation** Since these are genuine or aftermarket bolts designed for the specific application, they should install without requiring excessive force or modification. This can save time and frustration compared to mismatched or inferior aftermarket alternatives.

4. **Warranty Coverage** AC Delco parts often come with warranties, providing some assurance against defects in materials or workmanship. This can offer peace of mind if issues arise shortly after installation.

5. **Prevents Common Issues** Loose or improper cylinder head bolts are a leading cause of head gasket failure, coolant leaks, or even catastrophic engine damage. Using the correct bolts helps maintain proper compression and sealing, reducing the risk of these problems.

6. **Compatibility with LS Engine Tuning** If you plan to modify your engine (e.g., forced induction, high-performance camshafts, or increased power), these bolts are better suited to handle the increased stress than generic or low-quality replacements.

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1. **Cost** AC Delco bolts are more expensive than generic or budget aftermarket alternatives. While they offer better quality, the price may be a concern for those on a tight budget, especially if purchasing as part of a larger cylinder head rebuild kit.

2. **Potential Overkill for Stock Applications** If your engine runs stock power levels (e.g., naturally aspirated, stock camshaft, and no forced induction), these high-quality bolts may be more than necessary. In such cases, a lower-cost bolt set could suffice without sacrificing reliability.

3. **Availability and Lead Times** Depending on the seller or retailer, these bolts may not always be in stock, leading to delays in purchasing or installation. Online marketplaces like OLX may have inconsistent availability compared to dedicated auto parts stores.

4. **Mixed Quality on Secondary Markets** If purchasing from a used or third-party seller (e.g., OLX), there is a risk of receiving counterfeit, reused, or damaged bolts. Always verify the seller s reputation and inspect the bolts for signs of wear, corrosion, or tampering before purchase.

5. **Installation Knowledge Required** While these bolts are designed for the application, improper installation (e.g., incorrect torque sequence, overtightening, or using the wrong tools) can still cause issues. This requires following the manufacturer s torque specifications and procedures precisely.

6. **Potential for Over-Torquing** Some bolt sets (even OEM-quality ones) can be prone to overtightening if not handled carefully. Excessive torque can lead to bolt stretch, warping, or even thread damage, negating the benefits of the high-quality material.

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The AC Delco OLX-ACD12558840-CL360A84 cylinder head bolt pack is a **strong choice** for a 2004-2006 Pontiac GTO, especially if you plan to modify the engine, run it at higher power levels, or want to ensure long-term reliability. The OEM-quality materials and proper fitment make them a safer option than generic bolts, reducing the risk of head gasket failure or coolant leaks. However, the higher cost and the need for careful installation may not justify the purchase for stock applications or those operating on a tight budget.

If you re rebuilding the cylinder head as part of a **major overhaul, forced induction setup, or high-performance application**, investing in AC Delco bolts is well worth it. For **stock or lightly modified engines**, a slightly cheaper bolt set (while still reputable, like those from **Fel-Pro, ATE, or even some high-end generic brands**) could be a cost-effective alternative without sacrificing reliability.

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- Consider a **mid-range bolt set** from a reputable brand like **Fel-Pro (part # 20-3000), ATE (part # 100-100), or even a high-quality generic set** (e.g., **MagnaFlow or Moroso**). These are often just as reliable for stock applications and significantly cheaper.

- Verify the **torque specifications** (typically **60-70 ft-lbs for LS1/LS2 heads**) and follow the **correct sequence** to avoid issues.

- **Stick with the AC Delco bolts** or consider **even higher-end options** like **MagnaFlow s LS Engine Bolt Set** or **Moroso s LS Head Bolt Kit**, which are designed for extreme power applications.

- Pair them with a **new head gasket** (e.g., **Fel-Pro 20-3000 or Moroso 12-10000**) and **high-quality thread locker** (e.g., **Permatex 24200**) to ensure a secure seal.

- For **new, authentic AC Delco bolts**, purchase from **official dealers, RockAuto, Summit Racing, or Amazon** to avoid counterfeit or reused parts.

- If buying from **OLX or a used market**, inspect the bolts for **signs of use (e.g., rust, bent heads, or uneven wear)** and ask the seller for proof of authenticity (e.g., original packaging or receipt).

- Always follow the **torque sequence** (usually a star pattern) to ensure even clamping.

- Use a **torque wrench** and **do not exceed the specified torque** (over-torquing can damage the head or bolts).

- Consider **reusing bolts only if they are in pristine condition** (no stretch, no rust, no bent heads). If in doubt, replace them.

- Apply a **light coat of anti-seize** to the threads to prevent seizing during removal in the future.

**Final Verdict:** The AC Delco bolts are a **solid, high-quality choice** for the Pontiac GTO, particularly for performance applications. However, for stock or budget-conscious builds, a slightly cheaper but still reliable bolt set may suffice. Always prioritize **proper installation and maintenance** to maximize the lifespan of your cylinder head assembly.

Details:

Ruico37: Verified Purchaser. I really appreciate the careful packaging to ensure everything arrived safely. PONTIAC: GTO 2004 -2006. Fast shipping, Well packaged, as described and great price.

Engineered For Longevity: Crafted from top-tier materials, this product has Cleaned Template. From precision-engineered lighting solutions to high-quality replAcement parts, these top-rated items are trusted by drivers and mechanics. I would gladly purchase again in the future. Honest and reliable highly recommended for anyone considering buying from them.

Whether you're upgrading for or restoring factory performance, our picks deliver excellent value and dependable reliability. The item arrived quickly, well packaged, and exactly as described. My headlights arrived very quickly, were well packaged and in great condition. Would be happy to do business again in the future.

Great value and quality as they were not only beautiful but CAPA approved. Lasconi95: Verified Purchaser. Jody ne: Verified Purchaser. Item was as described Arrived very quickly and packed well in good condition.

Priced right, well packed for shipping, sent lightning quick. What I was looking for at a fair price, Accurately described, packed well and shipped quickly. Chamber-58: Verified Purchaser. Item received new, as described, of apparent OEM quality.

part #: 198995106798 prices

• $47.99-$80.00

specifications cylinderheapar:

• for models: Gto
• for makes: Pontiac
• for years: 2004-2006
• brand: Ac Delco
• mpn: Olx-acd12558840-cl360a84
• type: Automotive
• material: Steel
• item weight: 0.2500
• fitment type: Direct Replacement
• generic keywords 1: Part
• intended use: Automobiles
• misc fitment notes: See Notes
• manufacturer warranty: 1 Year
• upc: 198995106798

general cylinderheapar:

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

payments cylinderheapar:

• credit card: Mastercard
• wallet: Paypal
• other

shipping cylinderheapar:

• type: Fixed
• transit: 4-10 Days
• class: Standard
• service: Standard
• cost: $0.00

seller cylinderheapar:

• # reviews: 163713
• rating: 99.7%
• city: West Chicago, IL

offer cylinderheapar:

• availability: In Stock
• options: Ship-to-home
• started: May 1, 2026
• quantity: 6
• sold: 0

returns cylinderheapar:

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

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