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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KEVIN SUTHERLIN
Dallas, US
★★★★★ 5
Boys suit
Size: 10, Color: Lilac
Great boys suit! Soft, made with very good material! Color is exactly what you paid for! The stitching is amazing and good quality.
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Reviewed in the United States on December 30, 2025
C
CJ&Heather
Omaha, US
★★★★★ 5
Dapper kids suit
Size: 14, Color: Beige, Size: 14, Color: Beige
It checks all the boxes! This is on my 11 yr old son. Its a little big on him but I ordered a 14Y so that's expected. My son is ~58in & 100lbs Sizing is accurate with the chart. The pants have pockets and also elastic with buttons on the inside so you can adjust the waist. The vest also has 2 pockets. They are sewn shut so you will need to cut them open. The back has adjustable straps to make it tighter. The jacket has a total of 4 pockets, 3 outside and 1 inside. (The inside one is sewn shut). There are small shoulder pads on the jacket, nothing crazy. Overall this a high quality Boys suit and I'd recommend it.
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Reviewed in the United States on October 24, 2025
D
Dizzle
Whiting, US
★★★★★ 5
Nice kids suit
Size: 5, Color: Light Blue
This is a nice way to play up your son's sophistication. It is a linen suit, but isn't a true linen. It is a blend of linen, polyester and spandex, which isn't a bad thing for kids since it has a softer feel. Sizing was accurate. I'm looking forward to when he can wear this to a formal occasion.
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Reviewed in the United States on October 24, 2025
S
SUGAR
Belleville, US
★★★★★ 5
A suit I ABSOLUTELY love ☺️
Size: 14, Color: Lilac
This 3 piece suit is one of our FAVORITES! I firstly love the color which isn’t one I had seen very often and it’s not to bright, rather more neutral and formal. The suit is of luxury grade and standard with the matching durability along with perfect stitching from buttons to seams. The suit came with 3 flawless pieces (blazer, slacks, and vest) all of which are true to size, well fitting, low maintenance, and very comfortable. I couldn’t think of a better special occasion suit or gift, and I HIGHLY recommend ⭐️⭐️⭐️⭐️
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Reviewed in the United States on November 6, 2025
A
Angel
Charlottesville, US
★★★★★ 5
Such a nice suit!
Size: 14, Color: Beige
I was pleased upon getting this suit for my son. I really like the color, which is kind of like an oatmeal color. Nice and light color. The material is light and thinner, but very comfortable. It fit my son really well. It’s not lined or the best quality suit, but because it is a linen suit, it works out and look really good. I would recommend this one, especially for more of the summer/spring time.
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Reviewed in the United States on October 28, 2025

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