ACDELCO C305 Delco Distributor Cap Nos Gm 12321579

( Brand: Acdelco ), ( Manufacturer Part Number: C305 ), ( Country Of Origin: United States ), ( Type: Distributor Cap ), ( Oe/oem Part Number: 12336838, 12321579 ), ( Color: Black )

Review ACDELCO Delco Distributor Cap Nos Gm fits 1980–1986

The **ACDelco C305 Delco Distributor Cap (GM Part Number 12321579, Fits 1980 1986 Models)** is a high-performance, OE-quality ignition component designed to ensure reliable spark delivery and optimal engine performance in select General Motors vehicles from the early 1980s. Crafted from durable, heat-resistant materials, this distributor cap is engineered to withstand the demanding conditions of high-voltage ignition systems while maintaining precise electrical conductivity. Its robust construction features a robust, molded rubber insulator that effectively prevents arcing and leakage, ensuring consistent spark transfer to the spark plugs. The cap is equipped with a high-quality, corrosion-resistant metal terminal for the ignition coil wire, providing a secure and stable connection that minimizes signal loss. Inside, the cap houses a precision-molded rotor assembly that directs the high-voltage spark to the correct spark plug in the firing order, reducing misfires and enhancing engine efficiency. ACDelco s reputation for engineering components to match or exceed OEM specifications ensures that this distributor cap delivers the same level of performance and longevity as the original equipment, making it an ideal replacement for older GM vehicles equipped with distributor-based ignition systems. Whether used in classic muscle cars, reliable sedans, or rugged trucks from this era, the C305 cap is a dependable choice for maintaining smooth operation and extending the life of the ignition system.

### **Pros and Cons of buying a ACDelco C305 Delco Distributor Cap (GM Part #12321579, Fits 1980-1986 GM Vehicles)**

1. **OEM Quality and Reliability** ACDelco is a trusted aftermarket brand owned by General Motors, known for producing parts that meet or exceed factory specifications. This cap is designed to function identically to the original GM component, ensuring proper ignition timing and performance.

2. **Direct Fitment** The part is explicitly listed for GM vehicles from 1980 to 1986, meaning it should install without modifications. This eliminates the need for adapters or customization, making it a straightforward replacement.

3. **Compatibility with Common Engines** The C305 cap is designed for standard distributor-based ignition systems found in many GM engines from that era, including but not limited to the 250, 262, 301, 305, and 350 inline-six and V8 applications.

4. **Affordable Replacement Option** Compared to purchasing an original GM distributor cap (which may be harder to find or more expensive), the ACDelco version offers a cost-effective solution without sacrificing quality.

5. **Widely Available** As an aftermarket part, it is stocked by most auto parts retailers (AutoZone, O Reilly, RockAuto, etc.), making it easy to purchase online or in-store without long wait times.

6. **Prevents Ignition Issues** A failing distributor cap can cause misfires, poor starting, or electrical shorts. Replacing it with a known-good part can resolve these problems and improve engine reliability.

7. **Long-Term Durability** ACDelco parts are built to last, reducing the likelihood of needing frequent replacements. The cap is typically made from durable plastic and includes proper internal wiring for consistent performance.

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1. **Aftermarket vs. OEM Confusion** Some buyers may prefer an original GM part for absolute certainty, though the difference in quality between ACDelco and genuine GM parts is often negligible for most applications.

2. **Potential Counterfeit Concerns** While ACDelco is reputable, counterfeit parts can sometimes enter the market. Purchasing from authorized retailers (like RockAuto, Amazon, or reputable local shops) minimizes this risk.

3. **Distributor System Depreciation** If the rest of the distributor (rotor, ignition coil, or points, if applicable) is worn out, replacing just the cap may not fully resolve ignition problems. A full distributor rebuild or replacement might be needed.

4. **Limited Longevity in Harsh Conditions** Extreme heat, moisture, or prolonged exposure to chemicals (e.g., gasoline spills) can degrade even high-quality caps over time. Regular inspection is recommended.

5. **No Warranty on Some Retailers** While ACDelco parts often come with manufacturer warranties, some online sellers may not offer returns or replacements if the part fails prematurely. Always check the retailer s return policy.

6. **Installation Requires Basic Mechanical Skill** Replacing a distributor cap is a relatively simple job, but it does require disconnecting the battery, removing the old cap, and ensuring the new one is properly seated and wired. Those uncomfortable with DIY repairs may need to pay for professional installation.

7. **Not a Permanent Fix for Underlying Issues** If the distributor is old or the ignition system has other faults (e.g., a failing rotor or coil), the cap replacement alone may not be a long-term solution. A full distributor overhaul may be necessary.

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The **ACDelco C305 distributor cap (GM #12321579)** is an excellent choice for replacing a worn or faulty distributor cap in 1980 1986 GM vehicles. It offers **reliable performance, easy fitment, and cost-effectiveness** while maintaining OEM-level quality. The part is well-suited for most DIY enthusiasts and mechanics looking for a **direct replacement** without compromising on durability.

However, buyers should ensure they purchase from a **trusted retailer** to avoid counterfeit parts and consider whether the **entire distributor system** needs attention. If the cap is the only failing component, this part will provide a **quick, affordable fix** for ignition-related issues.

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- You need a **direct replacement** for a failing cap in a 1980 1986 GM vehicle.

- You want **OEM-quality performance** at a reasonable price.

- You re comfortable with a **simple DIY installation** or have access to a mechanic.

- The rest of the distributor (rotor, coil, etc.) appears to be in good condition.

- You suspect **other distributor components** (rotor, coil, or points) are failing replace them simultaneously for long-term reliability.

- You prefer **original GM parts** and can source them (though ACDelco is nearly identical in quality).

- You re unsure about installation have a mechanic verify the fitment before purchase.

**Final Verdict:** **Highly recommended** for most applications, provided the purchase is made from a reputable source. It s a **proven, cost-effective solution** for restoring proper ignition function in older GM vehicles.

Details:

Fitment as noted on similar NOS listings. Part #: C305 12321579 New Old Stock NOS in original packaging, unused. Compatible Vehicles. This cap fits many GM, Dodge, Chrysler, and Plymouth V8 vehicles from the early 1980.

Common fitments include: GM: 1980 1986 Chevrolet C/K trucks 5.0L 5.7L V8. Type: Distributor cap for ignition systems on various V8 engines. Brand: GM / Delco ACDelco.

part #: c305 prices

• $13.95-$38.99

specifications ocoosys:

• for years: 1980-1986
• brand: Acdelco
• mpn: C305
• country of origin: United States
• type: Distributor Cap
• oe/oem part number: 12336838, 12321579
• color: Black

offer ocoosys:

• availability: In Stock
• sold: 0
• started: May 22, 2026
• options: Ship-to-home
• best offers: True
• quantity: 1

returns ocoosys:

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

general ocoosys:

• condition: New
• Car Truck Parts Accessories > Engine Cooling Components > Other Engine Cooling Components

payments ocoosys:

• wallet: Paypal
• credit card: Diners-club
• other

shipping ocoosys:

• service: USPS Ground Advantage, UPS Ground Saver, USPS Priority Mail, FedEx Ground Economy
• class: Standard, Economy, Expedited
• transit: 6-12 Days
• carrier: USPS, UPS, FedEx
• cost: $10.97
• type: Calculated

seller ocoosys:

• # reviews: 13099
• rating: 99.8%
• city: Delray Beach, Florida

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