A Guide to Engine Water Pumps for the 1958-1964 Chevrolet Impala
Keep your classic Impala's engine cool and reliable with the correct new water pump.
- You must confirm if your Impala needs a 'short' or 'long' style water pump before ordering to ensure proper belt alignment.
- A coolant leak from the front-center of the engine is the most common sign of a failing water pump.
- For most drivers, a standard new replacement pump from a reputable brand like ACDelco or Gates offers the best balance of quality and value.
- It is highly recommended to also replace the thermostat, coolant, and radiator hoses when replacing the water pump.
Signs of a Failing Water Pump
For a classic car like the 1958-1964 Impala, the water pump is a common wear item. Catching the signs of failure early can save you from a much bigger headache. Look out for these symptoms:
- Coolant Leaks: This is the most common sign. You may see green or orange fluid dripping from the front-center of the engine or notice stains on your driveway. 🎬 Watch: 8 common symptoms of a failing water pump A leak comes from the pump's "weep hole," a small opening designed to let coolant escape when the internal seals fail.
- Overheating: If your temperature gauge is climbing higher than normal, the water pump may not be circulating coolant effectively. If you see steam coming from under the hood, pull over immediately as this indicates a severe overheating problem.
- Unusual Noises: A whining, grinding, or squealing sound from the front of the engine that changes with engine speed can point to a failing bearing inside the water pump.
- Wobbly Pulley: If you can see the water pump pulley wobbling while the engine is running (or feel play in it when the engine is off), the bearing is worn out and the pump is on the verge of complete failure.
Crucial Fitment Note: Short vs. Long Water Pumps
One of the most critical details when ordering a water pump for a classic Chevrolet is determining if you need a "short" or "long" style pump. For 1958-1964 Impalas, the original factory pump was a short-style pump. However, due to engine swaps and modifications over the decades, your car may now have a long-style pump. Using the wrong one will cause misalignment of all your belts and pulleys.
- Short Pump: Measures approximately 5-5/8" from the engine block mounting surface to the pulley mounting flange.
- Long Pump: Measures approximately 7" from the engine block mounting surface to the pulley mounting flange.
Pro Tip: Before ordering, measure your existing water pump or check the clearance between the pump and the timing chain cover. A short pump has very little space (less than an inch), while a long pump has a noticeable gap of about two inches.
🎬 See how to identify a short vs. long pumpChoosing Your Aftermarket Water Pump
For a vehicle of this age, true "OEM" parts are no longer manufactured by GM. All available new parts are from the aftermarket. Quality varies by brand, so it's important to choose a reputable manufacturer.
Performance Brands (Edelbrock, Weiand, Frostbite)
These brands specialize in high-performance parts. Their water pumps are often made from lightweight aluminum and feature improved impeller designs for increased coolant flow, which can help with modified engines that produce more heat. Edelbrock pumps, for example, are known for their quality construction and ability to cool more effectively than stock designs. They are the most expensive option but are a good investment for high-performance street cars or if you want the best cooling possible.
Standard Replacement Brands (ACDelco, Gates, Dayco, GMB)
These brands offer quality replacement parts that meet or exceed original factory specifications. For a stock or mildly modified Impala, a pump from one of these brands is an excellent choice.
- ACDelco: Often considered the OEM equivalent for GM vehicles, providing reliable performance.
- Gates: A well-respected name in belts and cooling system components, their water pumps are considered a top-tier OEM comparable replacement.
- GMB: A long-standing manufacturer that produces parts for many car companies. They offer a good balance of quality and price, though some forum users report mixed long-term experiences.
Value Brands (US Motor Works, Proform, PRW, Mr Gasket)
These brands typically offer the most affordable options. While they can be a good choice for a budget-conscious repair, quality can be less consistent than with premium or standard brands. For a classic vehicle where reliability is key, it's often worth spending a little more for a pump with a better track record.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Water Pump | $46.88 - $279.38 |
| Shop Labor | $200 - $450 |
| New OEM | Not Available |
| Remanufactured | $60 - $120 (Not Recommended) |
Frequently Asked Questions (FAQ)
What else should I replace with the water pump?
Since you'll be draining the cooling system and removing the belts, it's a perfect time to replace the thermostat, radiator hoses, heater hoses, and the drive belts. This is inexpensive preventative maintenance that can save you from future breakdowns.
🎬 Watch this small block Chevy water pump installation guideShould I get a high-flow water pump?
For a stock engine, a standard replacement pump is perfectly adequate. A high-flow pump from a brand like Edelbrock can provide better cooling, which is beneficial for modified engines or for driving in hot climates. However, it must be paired with a high-flow thermostat to see the full benefit.
Is a cast iron or aluminum pump better?
Original pumps were cast iron. Modern performance pumps are often aluminum, which saves weight and can dissipate heat better. For most users, a quality cast iron pump from a brand like Gates or ACDelco is durable and effective. Performance-oriented users may prefer a lighter, high-flow aluminum pump from Edelbrock or Weiand.
Why is it important to identify short vs. long pump style?
The pump's length determines the position of the pulley. Installing a long pump on a system designed for a short pump (or vice-versa) will cause the pulleys for the alternator, power steering, and crankshaft to be misaligned. This will cause the belts to wear out quickly, squeal, or fly off entirely.
Helpful Videos
![How To: Replace a Water Pump [Small-Block Chevy]](https://img.youtube.com/vi/6clYmNIWEe0/mqdefault.jpg)
Technical Specifications
The most critical specification is the pump style: 'Short' (approx. 5-5/8" length) or 'Long' (approx. 7" length). 1958-1964 Impalas were originally equipped with a short-style pump.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Signs of a Failing Water Pump
- Crucial Fitment Note: Short vs. Long Water Pumps
- Choosing Your Aftermarket Water Pump
- Performance Brands (Edelbrock, Weiand, Frostbite)
- Standard Replacement Brands (ACDelco, Gates, Dayco, GMB)
- Value Brands (US Motor Works, Proform, PRW, Mr Gasket)
- Frequently Asked Questions (FAQ)
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