GM 3991423-BN Water Pump Groove Pulley

( Brand: Gm ), ( Manufacturer Part Number: 3991423-BN ), ( Type: Water Pump Pulley ), ( Vintage Part: Yes ), ( Universal Fitment: No ), ( Country Of Origin: United States )

Review GM Original Logo Water Pump Groove Pulley fits CORVETTE C3 1971–1980

title: GM 3991423-BN Water Pump Groove Pulley for 1971-1980 C3 Corvette

The GM 3991423-BN Water Pump Groove Pulley is an essential component for the cooling system of your 1971-1980 C3 Corvette. This pulley is designed specifically for the water pump and plays a crucial role in transferring engine power to the water pump through a belt system.

This pulley is manufactured with high-quality materials to ensure durability and reliability. The grooves on the pulley are precisely machined to properly engage with the belt, providing an efficient power transfer and maintaining optimal cooling system performance. The pulley is also engineered to fit securely on the water pump shaft, ensuring a tight connection and minimizing any potential vibrations or noise.

The GM 3991423-BN Water Pump Groove Pulley is a direct replacement part for the original equipment on your 1971-1980 C3 Corvette. Installing this pulley is a straightforward process that can be completed with common hand tools, making it a convenient upgrade for any Corvette enthusiast or restorer. By using a genuine GM part, you can trust that you are getting a product that meets or exceeds the original equipment standards, providing peace of mind and ensuring the continued reliability and longevity of your beloved Corvette.

In summary, the GM 3991423-BN Water Pump Groove Pulley is a high-quality, direct replacement part for the cooling system of your 1971-1980 C3 Corvette. It is precision-engineered with durable materials and precisely machined grooves to ensure efficient power transfer and optimal cooling system performance. Installing this pulley is a straightforward process, making it a must-have upgrade for any Corvette enthusiast or restorer.

Buying a GM 3991423-BN water pump with a groove pulley for a 1971-1980 C3 Corvette involves considering several pros and cons to help make an informed decision.

1. OEM Part: This water pump is an Original Equipment Manufacturer (OEM) part produced by General Motors, ensuring it is a perfect fit and matches the original specifications of the vehicle.

2. Durability: OEM parts are typically of high quality and built to last longer than aftermarket parts. This can save you from future replacement costs.

3. Warranty: When purchased from an authorized dealer, OEM parts often come with a warranty, providing peace of mind and protection against defects.

1. Cost: OEM parts can be more expensive than aftermarket parts due to their originality and the brand reputation.

2. Availability: Depending on the specific model and year of your Corvette, OEM parts may be harder to find and require more time to source.

3. Limited options: OEM parts do not offer as many customization options as aftermarket parts.

If you prioritize the perfect fit, durability, and the peace of mind that comes with a warranty, purchasing an OEM water pump with a groove pulley for your 1971-1980 C3 Corvette is a good investment. However, if you're on a budget and are willing to accept the potential risks of aftermarket parts, you may want to consider that option instead.

If the cost is a concern, I would recommend exploring trusted aftermarket part manufacturers that offer OEM-equivalent quality and warranties. This way, you can balance the benefits of an OEM part with a more affordable price. However, if you prefer the security and confidence that comes with an OEM part, it is worth the investment.

Details:

But, trust me after 25 years I've seen it all. The photos are the items. 1971-1980 C3 Corvette w/ 350 5-13/16 DIA. Do not purchase the item wish you would have asked a question or 2.

ORIGINAL w/ GM LOGO 1971-1980 C3 Corvette Water Pump 2 Groove Pulley 3991423-BN.

part #: 3991423 prices

• $90.00-$200.00

specifications pulleyhop:

• for models: C3, Corvette
• for years: 1971-1980
• brand: Gm
• mpn: 3991423-bn
• type: Water Pump Pulley
• vintage part: Yes
• universal fitment: No
• country of origin: United States

payments pulleyhop:

• other
• credit card: Diners-club
• wallet: Apple-pay

general pulleyhop:

• condition: Used
• Car Truck Parts Accessories > Accessory Belts > Pulleys

offer pulleyhop:

• sold: 0
• quantity: 1
• availability: In Stock
• options: Ship-to-home
• started: November 17, 2025

shipping pulleyhop:

• service: USPS Ground Advantage, USPS Priority Mail, UPS Ground
• cost: $17.00
• class: Standard, Expedited
• type: Calculated
• transit: 4-8 Days
• carrier: USPS, UPS

seller pulleyhop:

• city: Montgomery, Texas
• # reviews: 2314
• rating: 100.0%

returns pulleyhop:

• policy: No Returns

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