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Description
1684 1966-1980 Chevy GM 366 427 water pumpBig blocks in big trucks need big cooling. We designed the 1684 pump for the 366 and 427 ci blocks. It has an impeller with an increased vane count and a reduced impeller vane clearance to take care of the problem. It achieves greater flow rates, higher head pressure and a more efficient flow. The impeller color is due to Type II Class II military grade surface coating which protects against corrosive fluids. FlowKooler introduced the first hi flow
Big blocks in big trucks need big cooling. We designed the 1684 pump for the 366 and 427 ci blocks. It has an impeller with an increased vane count and a reduced impeller vane clearance to take care of the problem. It achieves greater flow rates, higher head pressure and a more efficient flow. The impeller color is due to Type II Class II military grade surface coating which protects against corrosive fluids.
FlowKooler introduced the first hi flow pumps and continues to improve impeller design. Why is increased flow so important to cooling a hot Corvette engine? Because it has been proven time and time again that reducing the cycle time between the heat source and the heat sink creates more opportunities to shed heat and drop engine temperatures.
From 0-3,300 RPM…Nothing Beats a FlowKooler!
| General Specifications: | ||
|---|---|---|
| Type of Material of Pump Body | Cast Iron | |
| Number of Blades on Impeller | 16 CNC Aluminum | |
| Direction of Rotation | CW or CCW | |
| Fan Hub working height | 6 15/16" "long" | |
| Shaft diamets | 3/4" | |
| Hose Connections: | 1st | 2nd |
| Gender | F | F |
| Diameter | 1" | 3/4" |
| Threaded | Yes | Yes (in bypass) |
| Other Special Features: | ||
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| Parts Contained in Box: | ||
| Mounting Gaskets, By-pass Housing and Gasket,1" to 3/4" Reducer Bushing, 3/8" x 1 1/4" Bolts (2), Installation Sheet, FlowKooler Decal | ||
| Make | Model | Year | Block | CID | Liters |
| chevrolet | c30 pickup | 1966 | V8 | 366 | 6.0L |
| chevrolet | med/hd series 40 | 72-68 | V8 | 366 | 6.0L |
| chevrolet | med/hd series 50 | 72-66 | V8 | 366 | 6.0L |
| chevrolet | med/hd series 50 | 80-69 | V8 | 427 | 7.0L |
| chevrolet | med/hd series 60 | 72-66 | V8 | 366 | 6.0L |
| chevrolet | med/hd series 60 | 80-69 | V8 | 427 | 7.0L |
| chevrolet | med/hd series 65,70,80 | 80-69 | V8 | 427 | 7.0L |
| chevrolet | p20 van | 1967 | L3 | 159 | 2.6L |
| chevrolet | p30 van | 1967 | V8 | 366 | 6.0L |
| chevrolet | p30 van | 67-65 | L3 | 159 | 2.6L |
| gmc | all | 75-79 | V8 | 366 | 6.0L |
| gmc | all | 75-79 | V8 | 427 | 6.0L |
| gmc | series 50, 60, 65 | 66-72 | V8 | 366 | 6.0L |
| gmc | series 50, 60, 65 | 73-74 | V8 | 366 | 6.0L |
Shipping Notes
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
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4.6 ★★★★★
Based on 25 reviews
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Product Reviews
★★★★★ 5
Epic. Works great.
Color: Black
Works great every day. Super powerful and smooth compared to my old battery powered one. The shaft is much thicker and is more securely positioned so I can't imagine it becoming tweaked off balance like my old one. And it comes with an extra mixer attachment! I imagine I've put that away for a long time, but we'll see. Easy to turn on and off with one hand, but I can imagine it being less easy than a simple push button for someone with decreased thumb dexterity or mobility. I do wish the lowest speed was slightly lower, but it hasn't caused any splashing or other detriment. The speed adjustment is very smooth and power is abundant. Love the stand, Usb c charge port is solid, battery life is excellent.
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Reviewed in the United States on April 13, 2026
★★★★★ 5
You want this one, for power and quality and saving on AA battery costs
Color: Black
Yes. You want this one, for power and quality and saving on AA battery costs — buy it now. Don’t waste any more time comparing products.
After hours, days, weeks, of researching and comparing, I ordered this one. I do not regret it. It is powerful. It was less than $25 when I bought it. It has a USB charger port and it feels solid in your hand. It has a turn-knob at the top to control the variable speed immersion blender aka milk frother aka wand frother. Charge battery fully for 2hrs before first use and then you’re all set. It works very well. It functioned as expected and then even better. Yes. It exceeded expectations. I hope it lasts a long time. It feels like it is very well made and high quality. Classiest and best wand frother I have ever owned. And I’ve owned over 3-4 in the past 10yrs.
I got this one at $25 instead of the highest-rated one for $9.99 because those require AA batteries and this frother however is USB-C rechargeable!
So in 1-2 years it will have paid for itself in battery costs alone.
But there’s no price I can put on how enjoyable it is to use this super powerful, super smooth, high quality, wand frother.
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Reviewed in the United States on September 20, 2025
★★★★★ 5
Quality Design
Color: Gray
Excellent frother/mixer
Pros:
- Quality feels premium.
- Plenty of power to mix even with a drink packed with ice and peanut butter. Basically a mini handheld mixer.
- Ease of use is great. I appreciated that this had a longer brother so I can mix drinks in taller cups. Also the grip is fantastic and it is easy very easy to change the speed with just one hand so you can hold the drink with the other.
Longevity - So far it's been holding up and hasn't needed a battery replacement.
Cons:
None so far.
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Reviewed in the United States on December 10, 2025
★★★★★ 5
Highly recommend!
Color: Gray
Love this frother!!! Purchased to replace an Aerolatte that stopped working after a reasonable period of use. Right out of the box, it was charged and ready to go. I’ve been using it daily for about 5 weeks on the same charge it had on arrival and it’s still going strong. Love the variable speed and easy to work with one hand. And this baby can froth! It froths far better than our old Aerolatte. Also love the rechargeable feature so no more AA batteries wasted. This handy kitchen tool makes my morning coffee a true highlight. Highly recommend the Maestri milk frother!
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Reviewed in the United States on February 18, 2026
★★★★★ 5
Best Frother Ever!
Color: Black
Great little frother and very powerful after just one charge. I haven’t charged it since the first day and it is still going strong after 3 weeks. I use it daily for coffee froth, but have used it for mixing other things as well. It works great on mixing drink powders into water and for making salad dressing from scratch. It’s one of the best things I’ve purchased on Amazon for kitchen tools. My old frother ate through batteries and was 1/10th as powerful. This one really is amazing. Great quality heavy duty but still small machine. Extra attachment heads are also a bonus.
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Reviewed in the United States on May 23, 2026