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Description
1620 1962-1966 Buick 401 425 Nailhead water pump for AC carsFlowkooler high flow pump 1620 for the Buick Nailhead has a CNC machined billet impeller designed with an increased vane count and a tighter impeller clearance. 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
Flowkooler high flow pump 1620 for the Buick Nailhead has a CNC machined billet impeller designed with an increased vane count and a tighter impeller clearance. 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 Pontiac 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 | Aluminum | |
| Number of vanes on Impeller | 12 swept | |
| Direction of Rotation | CW | |
| Fan Hub Height | 3 9/16" | |
| Shaft Diameter | 5/8" | |
| Hose Connections | 1st | 2nd |
| Gender | m | NA |
| Diameter | 3/4" | NA |
| Threaded | No | NA |
| Other Special Features: | ||
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| Parts Contained in Box: | ||
| Mounting Gasket, Installation Sheet, FlowKooler Decal | ||
| Make | Model | Year | Block | CID | Liters |
|---|---|---|---|---|---|
| buick | electra | 63-62 | All | All | All |
| buick | electra | 66-64 | V8 | 401 | 6.6L |
| buick | electra | 66-65 | V8 | 425 | 7.0L |
| buick | lesabre | 63-62 | All | All | All |
| buick | riviera | 65-63 | V8 | 401 | 6.6L |
| buick | riviera | 66-63 | V8 | 425 | 7.0L |
| buick | wildcat | 66-64 | V8 | 403 | 6.6L |
| buick | wildcat | 66-64 | V8 | 425 | 7.0L |
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Exchange/Return Notes
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4.6 ★★★★★
Based on 1920 reviews
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Product Reviews
★★★★★ 4
My dog loves this toy but…
Color: Grey Bear - Large
This toy has many pros and cons, but it’s my dogs all time favorite toy so I have to give it 4 stars.
Pro:My German Shepard loves this toy, it has no squeaker and she hates squeakers, so she hasn’t tried to destroy it. It’s the perfect size for a large ball. She likes to throw her toys and this one has a pretty decent bounce to it so she can entertain herself.
Cons: the inside is hard rubber, she likes to throw her toys and it hurts when she hits you with it or drops it on your feet. Also a huge hazard to windows and anything breakable.
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Reviewed in the United States on July 12, 2025
★★★★★ 5
Pretty awesome chew toy
Color: Grey Bear - Large
This toy is great!! I have a doodle that shreds everything in sight, including durable toys, but this one stood up to the Teddy test! He easily ripped off the ear/feet bits, but the fabric casing hasn’t come off after a week of play, and I expect the rubber toy inside will be even harder to break.
This is a fairly heavy toy, so it makes a thunk when it drops and is probably not suitable for small dogs. It has a light squeak that is quiet and infrequent enough to not annoy me, and it’s pretty cute too!! it does get soaked in drool pretty fast (and takes forever to dry), but at this point i’m grateful it lasts long enough to get drooled on at all.
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Reviewed in the United States on September 30, 2025
★★★★★ 3
less than 24 hours :/
Color: Grey Bear - Large, Color: Grey Bear - Large
smaller than i expected but had a strong interior that i was pleasantly surprised with. my lil lady very much enjoyed it, however it lasted less than 24 hours before the poor toy was skinned alive :( she loves plushies and she’s obsessed w his skin after tearing him apart. it does have a solid rubber interior that is still good as a toy, however i was hoping its skin would stay on longer than a day :( overall decent toy, 3 stars for being destroyed so quickly. wouldn’t recommend for strong chewers
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Reviewed in the United States on August 7, 2025
★★★★★ 5
Lasts long
Color: Panda Bear - Large
Perfect for super chewer dogs.
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Reviewed in the United States on May 14, 2026
★★★★★ 4
Dachshund said “did I hear indestructible‽ Hold my ball”
Color: Grey Bear - Large
My 15lb Dachshund took this toy as a personal challenge.
He heard me tell his human brother that it’s indestructible on the inside and said “hold my ball” promptly proceeding to schmurder the textile aspect of this adorable toy.
I’d say it took him a total of 23 1/2 minutes to get to the center of this tootsie pop. I’m not even mad tho bc he had no interest in actually ingesting the outer part, and is totally into the inner toy, which is, for him, literally indestructible. It’s solid rubber, has a wild and fun bounce to it on multiple surfaces.
Zodiac rates the squeak 10/10. It’s great especially for when I’m on a call or talking to someone in real life and can’t immediately throw said toy or pay complete attention to him.
In conclusion:
Your dog will probably love it, ((suggest to just keep an eye on them during the schmurder process and make sure you grab all the pieces that come off so none are swallowed))
Depending on your tolerance for squeaker pitch and frequency of squeak, it's a 4/10 in annoyance mostly bc it’s not a long drawn out squeak ((I can not tolerate those toys, they get “lost on top on my fridge” until I get up the courage to throw them out without him seeing)), it’s quick and requires a bit of effort to produce the sound however it’s a very high pitch squeak so it’s all up to your preference. I personally try to buy toys I can tolerate my dog loving on bc when he gets a new toy, it’s his favorite thing for a long time, like, it sleeps on the bed with us for the first month.
Hope your fur child loves this as much as mine did.
Not sure I’ll do the whole two in one toy thing again only he got through it so fast.
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Reviewed in the United States on December 25, 2025