1684 1966-1980 Chevy GM 366 427 water pump
SKU: 19983762158

1684 1966-1980 Chevy GM 366 427 water pump

Sale price$2783.25 Regular price$3092.50
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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:
  • 16 blade swept vane CNC Machined Aluminum impeller
  • Impeller protected with a military grade Type II class II surface coating
  • Alternative Part Numbers 3890018, 3927565, 3990992, 6258548
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
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
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]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 19983762158

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4.2 ★★★★★
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William Burgess
Lexington, US
★★★★★ 5
Fun
Style: Chain(Silver)1
This was really nice looking on my gf. It's a cheap pretty thing to wear. Of course you need to be careful as it's a little fragile being an inexpensive piece.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 14, 2025
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Verified Purchase
LuxChic
Lexington, US
★★★★★ 1
We’re not recommend it arrive tangled and once I put it on, it broke
Style: 8 Diamonds(Gold)
I ordered both the silver body chain and the gold body chain because I had an event and I wasn’t sure what color jewelry I would be wearing. They arrived in separate packaging. Both of them packaged horribly. Both of them were tangled and had horrible knots, making it nearly impossible to do. My daughter and I worked on them separately. She did the silver one. I did the gold one. They were very fragile so it took us probably about 20 to 30 minutes to untangle each one. I put it on and it broke less than two minutes later, that is the case for both of them, the one that was salvageable I attempted to wear for an evening out, and it broke even more. It’s sick more time. Did you tangle it than I actually got to wear it. I was not touching it, not moving it not pulling at it. The chain is just too fragile. I am calling Amazon for a refund and they are going back -both of them.
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Reviewed in the United States on March 1, 2026
P
Verified Purchase
Paige
Birmingham, US
★★★★★ 5
So Cute On! Perfect for Miami
Style: Chain(Gold)
I loved this gold body chain! I bought it for a girls trip to Miami and it was the perfect accessory. It added such a fun, stylish touch to my outfit and really elevated the whole look. It was lightweight, comfortable to wear, and stayed in place without feeling annoying or heavy. The gold color looked great and didn’t look cheap at all. If you’re looking for something cute and trendy for a vacation, beach day, or night out, this is a great option!
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Reviewed in the United States on April 30, 2026
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Verified Purchase
z123
Belleville, US
★★★★★ 5
Great necklace
Style: 1 Diamond(Gold)
Simple but cute
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Reviewed in the United States on May 28, 2026
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Verified Purchase
Sean
Waukegan, US
★★★★★ 3
Too Tangled
Style: 5 Diamonds(Gold)
This came extremely tangled. It took me about 20 minutes to untangle it then after I untangled it one of the pieces detached so it took me another 20 minutes to get it back together however, when I finally wore it, it was so cute but this should definitely be like on a cardboard body, so it won’t be so tangled up. I mean, it was ridiculous almost threw it away.
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Reviewed in the United States on April 30, 2026

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