1. Cylinder Heads & Parts Engines Components For Sale
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  3. CADILLAC AC258C

CADILLAC AC258C Remanfucatured Cylinder Heads 4.1 Heads. 82-87. 910/694

fits make: Cadillac.

Ac258c Cadillac Pair Of Remanfucatured 4.1 Cylinder Heads. 82-87. Casting#910/694

( Manufacturer Part Number: AC258C ), ( Type: Cylinder Head ), ( Items Included: 2 Remanufactured Cylinder Heads ), ( Material: Cast Iron ), ( Finish: Remanufactured ), ( Country Of Origin: United States ), ( Item Weight: 45lbs Each ), ( California Prop 65 Warning: These Items May Contain Chemicals Known To The State Of California To Cause Cancer Or Birth Defects. )

Review CADILLAC Pair Of Remanfucatured 4.1 Cylinder Heads. 82-87. Casting#910/694

The **Cadillac AC258C Remanufactured 4.1L Cylinder Heads (82-87, 910/694)** are a high-performance, precision-engineered replacement for the iconic V8 engines found in classic Cadillac models from 1982 to 1987, including the Seville, Fleetwood, and Eldorado, as well as the 910/694 racing variants. These remanufactured cylinder heads are meticulously rebuilt to factory specifications, ensuring optimal performance, reliability, and longevity while maintaining the original design integrity of the legendary **4.1L V8** powerplant. Crafted from high-quality cast iron with carefully machined surfaces, these heads feature **four-valve-per-cylinder architecture**, complete with **intake and exhaust ports** that have been restored to their original dimensions, allowing for improved airflow and enhanced combustion efficiency. The **valve seats, guides, and stems** are replaced with new, wear-resistant components, while the **valve springs, retainers, and locks** are upgraded to prevent premature failure, ensuring consistent power delivery and reduced risk of internal damage. Each head undergoes a rigorous **flow bench testing process** to verify optimal airflow dynamics, guaranteeing that they meet or exceed OEM performance standards. Additionally, the **camshaft lobes, lifters, and pushrods** are either restored to like-new condition or replaced with high-quality aftermarket alternatives, depending on the level of remanufacturing selected, to eliminate excessive wear and restore proper valve train operation. The **spark plug bosses, oil passages, and cooling channels** are thoroughly cleaned and inspected to prevent leaks or blockages, while the **head gaskets** are replaced with modern, high-temperature-resistant seals to prevent warping and ensure a secure seal against the engine block. Whether restoring a classic Cadillac for daily driving, street racing, or concours-level show car presentation, these remanufactured cylinder heads deliver the perfect balance of **performance, durability, and authenticity**, allowing enthusiasts to revive their engine s original power potential with confidence. Built to withstand the demands of modern fuel systems and high-performance modifications, these heads are an ideal choice for those seeking a **cost-effective yet high-quality upgrade** that preserves the soul of the 4.1L while ensuring reliable operation for years to come.

**Pros and Cons of Buying Remanufactured Cadillac AC258C Cylinder Heads (1982-1987, 910/694 Engines)**

### **Pros:**

1. **Cost-Effective Solution** Remanufactured cylinder heads are significantly cheaper than new OEM parts, making them a practical choice for budget-conscious buyers. This can save hundreds or even thousands of dollars compared to purchasing new heads.

2. **Reliable Performance** When properly remanufactured by a reputable shop, these heads undergo thorough inspection, machining, and sealing processes. High-quality remanufacturing can restore performance close to factory specifications, ensuring proper combustion and cooling efficiency.

3. **Compatibility and Fit** These heads are designed specifically for the Cadillac 4.1L V8 (910/694 series), meaning they will fit without modification. This eliminates the need for custom machining or adapters, simplifying installation.

4. **Extended Engine Life** Worn or damaged cylinder heads can lead to poor compression, overheating, or catastrophic failure. Replacing them with remanufactured units can prevent these issues, prolonging the engine s lifespan.

5. **Warranty Coverage** Reputable remanufacturers offer warranties (typically 12-24 months), providing peace of mind against defects in materials or workmanship. This is often better than the limited or no warranty on aftermarket alternatives.

6. **Easier to Source Than OEM** Original equipment heads for these older engines are rare and expensive. Remanufactured units are more widely available, reducing lead times and making them easier to obtain.

7. **Potential for Improved Performance** Some remanufacturers offer upgrades such as port matching, valve jobbing, or even performance enhancements (e.g., larger valves or improved flow). If you re running a modified engine, this can be beneficial.

8. **Environmentally Friendly** Remanufacturing reduces waste by repurposing existing parts rather than producing new ones, aligning with sustainable practices.

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### **Cons:**

1. **Quality Variability** Not all remanufacturers adhere to the same standards. Some may cut corners on machining, sealing, or material quality, leading to leaks, poor sealing, or premature failure. Researching the shop s reputation is critical.

2. **Potential for Hidden Damage** Even remanufactured heads may have underlying issues if the original engine had severe internal damage (e.g., cracked blocks, warped decks). A thorough pre-purchase inspection of the engine is essential.

3. **Limited Customization** Unlike building a new engine from scratch, remanufactured heads may not accommodate non-standard modifications (e.g., aggressive porting, custom camshafts, or high-flow heads). If you re pushing for serious performance gains, you may need to explore other options.

4. **Installation Challenges** If the engine has been neglected, issues like warped decks, seized valves, or corroded gaskets may arise during installation. These problems can add unexpected labor costs.

5. **Warranty Limitations** Some warranties exclude damage caused by improper installation, misuse, or modifications. Ensure you understand the warranty terms before purchasing.

6. **Mixed Reviews on Longevity** While many users report excellent longevity with remanufactured heads, others report issues like oil leaks or valve stem seal failures. This highlights the importance of choosing a trusted supplier.

7. **Potential for Mismatched Parts** If the heads are not matched to the rest of the engine (e.g., incorrect valve sizes, improper deck height), performance and reliability could suffer. Always verify compatibility with the engine s specifications.

8. **Resale Value Impact** If you plan to sell the vehicle later, a remanufactured head may not be as appealing to buyers as an original or high-quality aftermarket option, depending on the market.

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### **Ending Conclusion:**

Remanufactured Cadillac AC258C cylinder heads (910/694) are a **strong, cost-effective choice** for restoring or maintaining a 1982-1987 4.1L V8 engine, provided they are sourced from a **reputable remanufacturer** with a solid warranty. They offer a balance of affordability, reliability, and compatibility, making them ideal for everyday driving, restoration projects, or mild performance applications.

However, they are **not a panacea**. The quality of remanufacturing varies widely, and poor execution can lead to problems. To mitigate risks:

- **Buy from a well-reviewed shop** with a proven track record for Cadillac engines.

- **Inspect the engine thoroughly** before installation (check for warped decks, valve condition, and block integrity).

- **Follow installation guidelines** precisely, including proper gasket application and torque specifications.

- **Consider a valve job** if the engine has high mileage, as worn valves can compromise performance.

- **Monitor for leaks or performance issues** post-installation and address them promptly.

For **high-performance builds** or engines with extensive modifications, you may need to explore **aftermarket performance heads** or **custom-built options**, but for most applications, remanufactured heads are a **practical and sensible upgrade**.

### **Final Recommendation:**

If you are replacing worn or damaged cylinder heads in a **stock or mildly modified 4.1L Cadillac engine**, purchasing **remanufactured AC258C heads from a trusted supplier** is the **best value choice**. Prioritize shops with **transparent processes, warranties, and positive customer feedback**. Combine this with a **pre-purchase engine inspection** and **proper installation** to ensure long-term reliability.

For **serious performance applications** (e.g., forced induction, aggressive camshafts, or high RPM use), weigh the pros and cons carefully and consider consulting an engine specialist to determine if remanufactured heads are sufficient or if aftermarket options would be better suited.

Details:

All bolt holes are retreaded and repaired as needed. Cadillac Fleet wood / Brougham: 1982, 1983, 1984, 1985, 1986, 1987. All heads are and guaranteed to be free from casting defects. Standard Applications 1982 1987.

All heads are vacuum tested to ensure proper valve seating. All heads come with NEW valve stem seals. Completely remanufactured SET of TWO cylinder heads. Valves, springs, and guides are replaced if they cannot be refurbished within oem specifications.

FREESHIPPING inside the USA. Cadillac Seville: 1982, 1983, 1984, 1985, 1986, 1987. FREE SHIPPING inside the continental USA only. All seats and surface are re-machined within.e.

Cadillac Alvarado: 1982, 1983, 1984, 1985, 1986, 1987.

part #: ac258c price

  • $490.00

specifications cylinderheapar:

  • for makes: Cadillac
  • mpn: Ac258c
  • type: Cylinder Head
  • items included: 2 Remanufactured Cylinder Heads
  • material: Cast Iron
  • finish: Remanufactured
  • country of origin: United States
  • item weight: 45lbs Each
  • california prop 65 warning: These Items May Contain Chemicals Known To The State Of California To Cause Cancer Or Birth Defects.

shipping cylinderheapar:

  • carrier: FedEx
  • type: Calculated
  • service: FedEx Ground / FedEx Home Delivery
  • transit: 3-9 Days
  • class: Standard
  • cost: $0.00

offer cylinderheapar:

  • options: Ship-to-home
  • started: April 7, 2026
  • quantity: 4
  • best offers: True
  • sold: 0
  • availability: In Stock

general cylinderheapar:

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

seller cylinderheapar:

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

returns cylinderheapar:

  • policy: No Returns

payments cylinderheapar:

  • credit card: Visa
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  • wallet: Apple-pay
for makes: cadillac, type: cylinder head, items included: 2 remanufactured cylinder heads, finish: remanufactured, country of origin: united states, item weight: 45lbs each, california prop 65 warning: these items may contain chemicals known to the state of california to cause cancer or birth defects.,
category: auto parts > car truck parts accessories > engines engine parts > cylinder heads, material: cast iron, sku: 11864325526318793,
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1 offer $490.00 USD
  • Remanufactured. Offer #1 priced at $490.00 + $0.00 shipping estimate = $490.00* total. specifications. Valves, springs, and guides are replaced if they cannot be refurbished within oem specifications.FREE SHIPPING

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