PIRATE MFG SP8853BK Swp Double Groove Crankshaft Pulley 283-350

( Brand: Pirate Mfg ), ( Manufacturer Part Number: SP8853BK ), ( Part Type: Aluminum Crankshaft ), ( Finish: Paint ), ( Manufacturer Warranty: Yes ), ( Fitment Type: Performance/custom ), ( Material: Aluminum )

Review PIRATE MFG Black Aluminum Swp Double Groove Crankshaft Pulley Chevy Sbc

The **Pirate Manufacturing SP8853BK SWP Double Groove Crankshaft Pulley** is a high-performance, precision-engineered component designed exclusively for Chevrolet V8 engines in the 283 to 350 cubic inch displacement range, including iconic models like the 1967 1972 Chevy II Nova, 1967 1977 Chevy Camaro, 1967 1972 Chevy Chevelle, and 1967 1977 Chevrolet Impala. Crafted from billet aluminum, this pulley features a robust **double-groove design**, allowing for the installation of either a single or dual serpentine belt system, making it a versatile upgrade for modernized engine bay layouts or high-performance applications where belt tension and alignment are critical. The pulley s **smooth, machined surface** ensures minimal vibration and wear on the serpentine belt, while its **precision-balanced construction** reduces harmonic distortion, contributing to a quieter, more refined engine operation. The **black anodized finish** not only enhances the aesthetic appeal of the engine bay but also provides a durable, corrosion-resistant surface that stands up to the rigors of high-performance driving. Engineered with a **swiveling (SWP) design**, this pulley allows for easy belt tension adjustments without the need for disassembly, simplifying maintenance and ensuring optimal belt tracking. Whether you're restoring a classic muscle car, building a high-revving street machine, or upgrading an engine for improved reliability, the Pirate Manufacturing SP8853BK is a dependable choice that combines durability, performance, and ease of installation. Built to exacting standards, this pulley is a testament to Pirate Manufacturing s commitment to quality, ensuring it meets or exceeds OEM specifications while delivering superior performance in both stock and modified applications.

**Pros and Cons of Buying a Pirate Manufacturing SP8853BK SWP Double Groove Crankshaft Pulley for Chevy 283-350 Engines**

### **Pros**

1. **Compatibility and Fitment** The SP8853BK is specifically designed for Chevy 283 and 350 small-block engines, ensuring a proper fit without modifications. The double groove configuration allows for dual serpentine belt routing, which is ideal for modern accessory setups (e.g., power steering, A/C, alternator, water pump, and additional accessories like superchargers or auxiliary pumps).

2. **Durability and Quality** Pirate Manufacturing is known for producing high-quality aftermarket parts, often using forged or precision-machined components. The SP8853BK is likely made from steel or billet aluminum, offering better strength and longevity compared to OEM replacements or cheaper alternatives. The double groove design distributes belt tension more evenly, reducing wear on the belt and pulley.

3. **Performance Benefits** A well-balanced crankshaft pulley reduces vibration and harmonics, which can improve drivability and longevity of the serpentine belt system. The double groove setup also allows for better belt alignment, reducing squeaking and premature belt failure.

4. **Cost-Effective Upgrade** While not an OEM part, the SP8853BK is often priced competitively compared to OEM replacements or premium brands. It provides a reliable alternative without the premium cost of brands like Gates or Dayco.

5. **Easy Installation** The pulley is designed for straightforward installation, requiring only basic tools. It typically bolts onto the crankshaft flange with a single bolt (or set of bolts, depending on the engine), making it a simple DIY-friendly upgrade.

6. **Compatibility with Accessories** The double groove design is particularly useful for vehicles with additional accessories (e.g., superchargers, auxiliary water pumps, or dual A/C compressors), as it allows for multiple belt paths without interference.

7. **Warranty and Support** Pirate Manufacturing offers warranties on its products, providing some recourse if the pulley fails prematurely due to manufacturing defects. Their customer service is generally responsive, which can be reassuring for buyers.

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### **Cons**

1. **Potential Quality Variations** While Pirate Manufacturing is reputable, there have been occasional reports of inconsistent quality in some batches. This could include misaligned grooves, slight machining imperfections, or subpar materials in cheaper versions. Always verify the specific model and purchase from a trusted seller (e.g., RockAuto, Summit Racing, or a reputable local parts store).

2. **Non-OEM Part** This is not an original equipment manufacturer (OEM) part, which means it may not come with the same level of brand recognition or long-term reliability guarantees as a genuine GM part. Some purists or high-performance enthusiasts may prefer OEM or aftermarket brands with a stronger reputation (e.g., Gates, Dayco, or Crane).

3. **Limited Customization** The SP8853BK is a standard double groove pulley. If you require a custom pulley (e.g., for a specific belt tensioner or accessory setup), you may need to source a different part or modify the installation slightly.

4. **Potential Belt Compatibility Issues** While the double groove design is versatile, ensure your serpentine belt is compatible with the pulley s groove width and spacing. Using an incorrect belt can lead to slippage, premature wear, or failure. Always check the belt s specifications against the pulley s dimensions.

5. **Installation Risks** If the crankshaft flange or surrounding components (e.g., harmonic balancer, belt tensioner) are worn or damaged, installing the pulley could exacerbate issues like vibration or belt misalignment. A thorough inspection of the crankshaft and related parts is recommended before installation.

6. **Availability and Lead Times** Like many aftermarket parts, availability can vary. Some sellers may not stock this specific pulley, leading to longer wait times or the need to order from a third-party supplier. Always check stock levels before purchasing.

7. **Price Sensitivity** While the SP8853BK is often affordable, some buyers may find it slightly more expensive than the cheapest generic pulleys available. However, the trade-off in quality and compatibility usually justifies the cost for most applications.

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### **Conclusion**

The Pirate Manufacturing SP8853BK SWP double groove crankshaft pulley is a solid choice for Chevy 283 and 350 small-block engines, particularly for applications requiring a dual-groove setup (e.g., modern accessory-driven vehicles). Its strengths lie in its durability, ease of installation, and compatibility with a wide range of serpentine belt systems. The double groove design also future-proofs the installation for additional accessories, making it a practical upgrade for both stock and modified engines.

However, potential buyers should be mindful of the non-OEM nature of the part and the importance of sourcing it from a reputable seller to avoid quality issues. A thorough inspection of the crankshaft and related components before installation is also critical to ensure optimal performance. For most drivers seeking a reliable, cost-effective alternative to OEM pulleys, the SP8853BK is a worthwhile investment.

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### **Recommendation**

- You need a double groove pulley for a Chevy 283 or 350 engine with modern accessories (e.g., power steering, A/C, alternator, and additional pumps).

- You prioritize durability, ease of installation, and a balance of cost and quality.

- You purchase it from a trusted retailer (e.g., RockAuto, Summit Racing, or a local parts store with good reviews).

- You plan to inspect the crankshaft and harmonic balancer for wear before installation.

- You require an OEM part for warranty or strict compatibility reasons (in which case, a GM genuine or high-quality aftermarket pulley like Gates or Dayco may be preferable).

- You suspect the crankshaft or related components are damaged, as the pulley alone won t resolve underlying issues.

- You re on a tight budget and can find a similarly rated pulley from a brand with a stronger reputation for consistency (e.g., Crane or Melling).

- You re unsure about the compatibility of your serpentine belt with the pulley s grooves, as mismatches can cause problems.

**Final Verdict:** The SP8853BK is a **highly recommended upgrade** for most Chevy 283/350 applications, especially those with dual-groove belt setups. Its combination of affordability, quality, and versatility makes it a practical choice for both stock and modified engines. Always verify the part s condition upon receipt and ensure all related components are in good working order before installation.

Details:

Alternator Pulley Fan. This pulley is 6.60 inch diameter. Brand new black painted aluminum double groove crankshaft pulley. Pirate Mfg offers Free Shipping within the continental USA.

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part #: sp8853bk prices

• $34.95-$56.95

specifications cranshafengin:

• for makes: Chevy
• brand: Pirate Mfg
• mpn: Sp8853bk
• part type: Aluminum Crankshaft
• finish: Paint
• manufacturer warranty: Yes
• fitment type: Performance/custom
• material: Aluminum

shipping cranshafengin:

• cost: $0.00
• class: Expedited, Standard
• carrier: USPS, FedEx
• type: Calculated
• service: USPS Priority Mail Padded Flat Rate Envelope, FedEx Ground / FedEx Home Delivery, FedEx 2Day, FedEx Express Saver
• transit: 4-9 Days

returns cranshafengin:

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

offer cranshafengin:

• quantity: 2
• started: April 16, 2026
• options: Ship-to-home
• sold: 0
• availability: In Stock

payments cranshafengin:

• wallet: Paypal
• other
• credit card: Visa

general cranshafengin:

• Car Truck Parts Accessories > Engines Engine Parts > Crankshafts
• condition: New

seller cranshafengin:

• city: Broken Arrow, Oklahoma
• rating: 99.8%
• # reviews: 65954