Help Finding a lower rad hose - The 1947 - Present Chevrolet & GMC Truck Message Board Network

NeoJuice · 08-08-2018, 11:15 AM

Water pump is 1 3/4" and lower rad neck is 1 1/2" and the elbow is probably just a standard 90 degree. Anyone have any part numbers?

Please and thank you.

crossfire84 · 08-08-2018, 06:49 PM

Quote:

Originally Posted by NeoJuice

Water pump is 1 3/4" and lower rad neck is 1 1/2" and the elbow is probably just a standard 90 degree. Anyone have any part numbers?

Please and thank you.

Go to your local auto parts store and have them look up the sizes in there books.

my56chevytruck · 08-08-2018, 07:07 PM

Quote:

Originally Posted by NeoJuice

Water pump is 1 3/4" and lower rad neck is 1 1/2" and the elbow is probably just a standard 90 degree. Anyone have any part numbers?

Please and thank you.

sorry, no part numbers, BUT, I'd suggest you mock up a hose using hand towel tubes or go buy some flexible tubing and make the shape you need. you should be able to find a hose with 2 different size inlets

**joedoh** · 08-08-2018, 08:04 PM

what motor what rad what truck?

and if its an AD with a SBC and a stock style rad look here.

http://67-72chevytrucks.com/vboard/s...d.php?t=768479

**3757chevy** · 08-08-2018, 08:30 PM

Napa 7344 or 7648 depending on where you need the length of the long side. or you can use an 1-3/4" hose with a reducer to 1-1/2" #901

**Backroads67** · 08-09-2018, 02:45 PM

Gates has a reference guide, (pdf) chart of molded hoses online. Download it and it has inlet and outlet sizes and length. When I did my chevelle, I found a half dozen that might be close then went to the parts store had them look up or cross reference the number, which had a pic attached so I could see what would work.

NeoJuice · 08-09-2018, 04:05 PM

Sorry I forgot to mention the engine type. SBC350 with AD OEM style aluminum rad.

I will look at the napa part numbers. Thank you to everyone for the great information.

OrrieG · 08-09-2018, 08:16 PM

look at this http://67-72chevytrucks.com/vboard/s...d.php?t=509289

NeoJuice · 08-23-2018, 10:58 AM

I want to say thanks to the people who responded to my post. I first tried the Napa 7648 but the 1.75" neck was to long off the water pump. Then I tried the 7344 and it was just right. Just had to trim a couple inches off the 1.5" end and it fits perfect.

dsraven · 08-23-2018, 02:50 PM

that's great.
for others who just can't find a match, I suggest using a piece of muffler pipe or the like, bent to fit the area, then have the exhaust shop swage one end a bit bigger to fit the larger size hose. install with short pieces of hose at each end. the bonus is that the pipe can have a tab welded on if it is a long run and then it can be supported-flexibly of course to allow engine movement under torque up. smooth the cut ends and use good quality hose clamps. it's only gotta hold 16 psi.

mr48chev · 08-23-2018, 03:08 PM

We need to put that hose number down in the things to remember list because someone else will be looking for it before long.

MiraclePieCo · 08-23-2018, 03:59 PM

Quote:

Originally Posted by NeoJuice

Sorry I forgot to mention the engine type. SBC350 with AD OEM style aluminum rad.

That's weird; all the OEM style aftermarket aluminum radiators I've seen have had 1-3/4" bottom hose size. I didn't even know they were available with 1-1/2 lower outlet. Mine:

NeoJuice · 08-23-2018, 06:07 PM

I thought it was a OEM style rad. I'm not sure because I bought the project partially completed.

Here is another picture for reference. I assumed it was OEM style because it fits between the rad support and blots into the factory OEM mounting holes. It also has built in trans cooler line hookups on the bottom.

It also has a flex-a-lite syclone fan on the front and I've added a painless wiring fan relay as well.

08-08-2018, 11:15 AM	#1
NeoJuice Registered User Join Date: Nov 2016 Location: Beaumont, Alberta Posts: 468	Help Finding a lower rad hose Water pump is 1 3/4" and lower rad neck is 1 1/2" and the elbow is probably just a standard 90 degree. Anyone have any part numbers? Please and thank you.

08-08-2018, 08:04 PM	#4
joedoh Senior Member Join Date: May 2007 Location: Doodah Kansas Posts: 7,761	Re: Help Finding a lower rad hose what motor what rad what truck? and if its an AD with a SBC and a stock style rad look here. http://67-72chevytrucks.com/vboard/s...d.php?t=768479 __________________ the mass of men live lives of quiet desperation if there is a problem, I can have it. new project WAYNE http://67-72chevytrucks.com/vboard/s...d.php?t=844393

08-08-2018, 08:30 PM	#5
3757chevy Senior Member Join Date: Mar 2016 Location: Near Canon City ,Colorado Posts: 3,900	Re: Help Finding a lower rad hose Napa 7344 or 7648 depending on where you need the length of the long side. or you can use an 1-3/4" hose with a reducer to 1-1/2" #901 Attached Images __________________ '35 1/2 ton Pickup (bought 2020) '68 C10 Suburban (bought 2021) '72 K5 Blazer (bought 2013) '67 Stepside (bought 1997-sold 2021) '96 Bronco Eddie Bauer (inherited 2010) My 1st day here-'67 C10(sold)and '72 K5 Blazer http://67-72chevytrucks.com/vboard/s...d.php?t=702056 "Another Blue Chevy"(1935) http://67-72chevytrucks.com/vboard/s...d.php?t=799203 '68 Burb...https://67-72chevytrucks.com/vboard/...d.php?t=822994 MIKE

08-09-2018, 02:45 PM	#6
Backroads67 Active Member Join Date: Sep 2016 Location: Washington, Ia. Posts: 110	Re: Help Finding a lower rad hose Gates has a reference guide, (pdf) chart of molded hoses online. Download it and it has inlet and outlet sizes and length. When I did my chevelle, I found a half dozen that might be close then went to the parts store had them look up or cross reference the number, which had a pic attached so I could see what would work. __________________ 72 K10 swb in progress 67 C10 swb 66 chevelle SS Conv 40 Plymouth pickup

08-09-2018, 04:05 PM	#7
NeoJuice Registered User Join Date: Nov 2016 Location: Beaumont, Alberta Posts: 468	Re: Help Finding a lower rad hose Sorry I forgot to mention the engine type. SBC350 with AD OEM style aluminum rad. I will look at the napa part numbers. Thank you to everyone for the great information.

08-09-2018, 08:16 PM	#8
OrrieG Registered User Join Date: Jun 2006 Location: Idaho Posts: 8,800	Re: Help Finding a lower rad hose look at this http://67-72chevytrucks.com/vboard/s...d.php?t=509289 __________________ 1959 Chevy Short Fleetside w/ 74 4WD drive train (current project) OrrieG Build Thread 1964 Chevelle Malibu w/ 355-350TH (daily driver) Helpful AD and TF Manual Site Old Car Manual Project

08-23-2018, 10:58 AM	#9
NeoJuice Registered User Join Date: Nov 2016 Location: Beaumont, Alberta Posts: 468	Re: Help Finding a lower rad hose I want to say thanks to the people who responded to my post. I first tried the Napa 7648 but the 1.75" neck was to long off the water pump. Then I tried the 7344 and it was just right. Just had to trim a couple inches off the 1.5" end and it fits perfect. Attached Images

08-23-2018, 02:50 PM	#10
dsraven Registered User Join Date: Nov 2010 Location: calgary alberta Posts: 7,914	Re: Help Finding a lower rad hose that's great. for others who just can't find a match, I suggest using a piece of muffler pipe or the like, bent to fit the area, then have the exhaust shop swage one end a bit bigger to fit the larger size hose. install with short pieces of hose at each end. the bonus is that the pipe can have a tab welded on if it is a long run and then it can be supported-flexibly of course to allow engine movement under torque up. smooth the cut ends and use good quality hose clamps. it's only gotta hold 16 psi.

08-23-2018, 03:08 PM	#11
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,396	Re: Help Finding a lower rad hose We need to put that hose number down in the things to remember list because someone else will be looking for it before long. __________________ Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.

08-23-2018, 06:07 PM	#13
NeoJuice Registered User Join Date: Nov 2016 Location: Beaumont, Alberta Posts: 468	Re: Help Finding a lower rad hose I thought it was a OEM style rad. I'm not sure because I bought the project partially completed. Here is another picture for reference. I assumed it was OEM style because it fits between the rad support and blots into the factory OEM mounting holes. It also has built in trans cooler line hookups on the bottom. It also has a flex-a-lite syclone fan on the front and I've added a painless wiring fan relay as well. Attached Images



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