HARLEY-DAVIDSON 327996-01 Spark Plugs Nos TP12S 32996-01

( Brand: Harley-davidson ), ( Manufacturer Part Number: 327996-01 ), ( Type: Spark Plug ), ( Machine Type: Street Motorcycle ), ( Vintage Part: Yes ), ( Country Of Origin: United States )

Review HARLEY DAVIDSON Vintage Motorcycle Spark Plugs New Nos fits SCREAMIN EAGLE

The **Harley-Davidson 327996-01 TP12S Spark Plug** from **Screamin Eagle**, part of the exclusive Harley-Davidson Performance Parts lineup, represents the pinnacle of precision engineering and high-performance tuning designed specifically for Harley-Davidson s most powerful and demanding engines. Engineered to deliver unparalleled power, responsiveness, and reliability, these spark plugs are meticulously crafted to meet the rigorous demands of modern Harley-Davidson V-Twin and Twin Cam engines, including the iconic Milwaukee-Eight and Evolution platforms. The **TP12S** designation signifies a **12mm thread size with a 12mm reach**, making it a direct replacement for OEM plugs while incorporating advanced materials and proprietary technology to enhance ignition efficiency and combustion stability. Built with a **double platinum electrode configuration**, these plugs feature a **fine-wire design** that ensures a consistent, high-energy spark even under extreme operating conditions, reducing fouling and extending service life. The **heat range is optimized for high-performance applications**, allowing for improved exhaust scavenging and better throttle response, particularly in high-revving or turbocharged setups where traditional plugs may struggle to maintain reliability. The **Screamin Eagle branding** itself is synonymous with Harley-Davidson s commitment to performance, and these plugs are no exception each one is rigorously tested to ensure compatibility with Harley s most aggressive riding styles, from cruising at highway speeds to aggressive track days. Whether installed in a stock engine for a subtle power boost or in a heavily modified setup for maximum output, these spark plugs are engineered to bridge the gap between stock reliability and high-performance demands, delivering a noticeable improvement in engine smoothness, acceleration, and overall drivability. For riders and mechanics who demand nothing less than the best, the **327996-01 TP12S** from Screamin Eagle is the ultimate choice for those seeking a balance of durability, performance, and Harley-Davidson authenticity.

### Pros and Cons of Buying Harley-Davidson Spark Plugs (Part Number: 327996-01 TP12S Screamin Eagle 32996-01 NOS)

1. **Performance Enhancement** Screamin Eagle spark plugs are designed to improve combustion efficiency, which can lead to better throttle response, smoother power delivery, and enhanced overall engine performance. The TP12S model is optimized for Harley-Davidson s Twin Cam engines, ensuring a tailored fit.

2. **Durability and Longevity** Screamin Eagle plugs are built with high-quality materials, including a platinum-iridium electrode blend, which resists wear and corrosion better than standard plugs. This can extend the life of the plug compared to OEM options, reducing the need for frequent replacements.

3. **Easier Ignition** The design of these plugs promotes better spark initiation, which can help prevent misfires, especially in high-performance or modified engines. This is particularly useful for Harley-Davidson bikes that see heavy use or modifications.

4. **Compatibility** These plugs are specifically engineered for Harley-Davidson s Twin Cam engines (common in models like the Sportster, Softail, and some Touring bikes). The "NOS" (New Old Stock) designation suggests they are genuine, high-quality replacements with minimal wear, ensuring a reliable fit.

5. **Brand Reputation** Screamin Eagle is a trusted brand under Harley-Davidson s performance division, known for producing parts that meet or exceed OEM standards. Buyers can expect consistent quality and reliability.

6. **Potential for Better Fuel Efficiency** Improved combustion can sometimes lead to slightly better fuel economy, though this depends on the bike s overall condition and tuning.

7. **Ease of Installation** Since these are direct replacements for Harley-Davidson s stock plugs, they are straightforward to install, requiring no modifications to the bike s wiring or ignition system.

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1. **Cost** Screamin Eagle plugs are more expensive than generic or aftermarket alternatives. For a single plug (or a set), the price is significantly higher than OEM or budget brands, which may not be justified for casual riders or those on a tight budget.

2. **Overkill for Stock Engines** If the Harley-Davidson engine is in pristine condition and running optimally with stock plugs, upgrading to Screamin Eagle may not provide noticeable benefits. The performance gains are more apparent in modified or high-mileage engines.

3. **Limited Lifespan Compared to Some Alternatives** While durable, platinum-iridium plugs (like the TP12S) may not last as long as some ceramic or iridium-only plugs from other brands. They typically require replacement every 10,000 15,000 miles, depending on riding conditions.

4. **Potential for Over-Tuning** If the engine is not properly tuned or maintained, upgrading to high-performance plugs could lead to issues like pre-ignition (knocking) or excessive wear on other engine components. This risk is higher if the bike is heavily modified.

5. **Availability and Lead Times** As NOS (New Old Stock) parts, these plugs may not always be in stock immediately, and ordering could require waiting for inventory, especially if purchasing from a specialty retailer.

6. **No Significant Aesthetic Benefit** Unlike some aftermarket parts, spark plugs do not offer any visual upgrades. The decision to use them is purely functional.

7. **Mixed Reviews on Performance Gains** Some riders report minimal differences in performance compared to stock plugs, while others notice a slight improvement. Results can vary based on the bike s age, condition, and other factors like fuel quality and air filters.

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Harley-Davidson s Screamin Eagle TP12S spark plugs (327996-01 or 32996-01 NOS) are a solid choice for riders who prioritize performance, durability, and brand reliability. They are particularly worthwhile for:

- High-mileage or modified Harley-Davidson engines.

- Riders who notice misfires or inconsistent ignition with stock plugs.

- Those who want to future-proof their engine with high-quality components.

However, they may not be necessary for riders with well-maintained, stock engines who are not seeking performance gains. The higher cost and potential overkill for stock bikes are valid considerations.

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- **Buy if:** You own a modified or high-mileage Harley-Davidson Twin Cam engine, experience ignition issues, or want to upgrade for better performance and longevity. The NOS designation ensures you re getting a high-quality, nearly new plug.

- **Skip if:** Your bike is in excellent condition with no performance complaints, you re on a budget, or you re unsure whether the benefits justify the cost. In such cases, OEM or high-quality aftermarket plugs (e.g., NGK or Denso) may suffice.

- **Alternative Consideration:** If you re unsure, test a single plug first or opt for a set to ensure compatibility and performance. Always pair spark plug upgrades with proper maintenance (e.g., fresh air filters, fuel system checks) for the best results.

Details:

Authentic New Old Stock. Boxes may show some minor signs of age and wear be a little dusty. Produced for Harley-Davidson, Milwaukee WI in 2000. Boxes do not appear to have ever been opened.

Manufactured by Spitfire, North brook IL. Part# 327996-01. Vintage Harley Davidson Motorcycle Replacement Parts. Vintage Harley-Davidson Motorcycle Screamin' Eagle Spark Plugs Triple Platinum # 327996-01 TP12S OEM.

part #: 32799601 prices

• $18.99-$28.99

specifications cyclesparkplugs:

• for models: Screamin, Eagle
• for makes: Eagle, Harley
• brand: Harley-davidson
• mpn: 327996-01
• type: Spark Plug
• machine type: Street Motorcycle
• vintage part: Yes
• country of origin: United States

shipping cyclesparkplugs:

• class: Standard, Expedited
• type: Calculated
• carrier: USPS
• cost: $8.12
• service: USPS Ground Advantage, USPS Priority Mail
• transit: 3-8 Days

seller cyclesparkplugs:

• city: Burlington, Wisconsin
• rating: 100.0%
• # reviews: 476

returns cyclesparkplugs:

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

offer cyclesparkplugs:

• quantity: 7
• options: Ship-to-home
• started: March 23, 2026
• availability: In Stock
• sold: 0
• best offers: True

general cyclesparkplugs:

• Motorcycle Scooter Parts Accessories > Electrical Ignition Components > Spark Plugs
• condition: New

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