05-03-2021, 01:53 PM | #1 |
Registered User
Join Date: Jan 2018
Location: Lemoore, CA
Posts: 74
|
Radiator hose ID
We’ve been trying to find rad hoses to fit my ‘69 c10. The old ones fit perfectly and the GM parts number is still on the upper. Chances are these aren’t original to this truck (engine was rebuilt in early 2000’s) so they may not be truck specific hoses. I’ve been trying to google the parts #. No luck.
The upper hose is stamped GM AY 3947120 RQ. The lower doesn’t have any stamps still on it, but I’m hoping if we can identify the upper it will give us a clue on the lower. The bends are perfect for keeping it away from the trans cooler lines. We were close with one but the water pump end was about 1/4” to small to fit onto the water pump. And we seriously tried everything to get it on there. Or maybe one of you amazing guys can tell just by looking at it what would work?! Go easy on me, I’m a noob. Here are some pics for reference Posted via Mobile Device |
05-03-2021, 02:32 PM | #2 |
All stock and staying that way
Join Date: Jul 2003
Location: Elkland, PA
Posts: 1,384
|
Re: Radiator hose ID
3947120 Inlet radiator hose 1.5" diameter is correct for 2WD '68-'72 10-30 Series and '70-'72 2WD Blazer 283-350
3918487 Outlet radiator hose 1.75" diameter is correct for '67-'72 283-350 10-30 series
__________________
1970 K/5 Blazer CST 4WD, Bronze, 93k ACT. miles, 350, 4 speed, positraction, 16.5" x 8.25" wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration in progress... 1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 41k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 60k miles, 3.6, 8L45, 3.23 LS, 18" wheels |
05-03-2021, 10:24 PM | #3 |
Registered User
Join Date: Aug 2007
Location: Birmingham, AL
Posts: 42
|
Re: Radiator hose ID
Get a metal clothes hanger and bend it in the same fashion the radiator hose is and take it to your local parts house. I've been able to have them let me look in the back at their selection of hoses, to match it up.
Good luck |
05-06-2021, 03:47 AM | #4 |
Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,585
|
Re: Radiator hose ID
You're over thinking the project.. Go to your local parts house that handles Gates hoses. (not O'Reillys).. Give 'em the year, make, and model and you'll get the correct hoses.. These old trucks are still "on the Books" in the Gates catalog..
|
05-07-2021, 12:41 AM | #5 | |
Senior Member
Join Date: Nov 2018
Location: Waterford California
Posts: 2,420
|
Re: Radiator hose ID
Quote:
But just for reference as to availability I don't endorse an of these just a reference. https://www.amazon.com/Silicone-Radi...s%2C247&sr=8-3 Also I don't know if it's made generic for both 2wd and 4wd but I have always had to trim the lower hose to fit for some reason. |
|
05-07-2021, 12:11 PM | #6 | |
Registered User
Join Date: Jan 2018
Location: Lemoore, CA
Posts: 74
|
Re: Radiator hose ID
Quote:
I was just hoping to get some guidance on what would replace these hoses because they fit perfectly and everything we’ve tried doesn’t cut it. |
|
05-07-2021, 12:36 PM | #7 |
Registered User
Join Date: Oct 2015
Location: IN
Posts: 209
|
Re: Radiator hose ID
This Dayco 70935 Radiator Coolant Hose replaces Gates 20868, CARQUEST 20868, ACDelco 26027X, General Motors 343490, General Motors 3918485, General Motors 3924601, General Motors 3947120, Goodyear 60990, General Motors 6274069, NAPA 7595, AutoZone C0868, Duralast E70935, OEM parts and is perfect for replacement or a performance upgrade.
Autozone and Advance also call it Dayco E70935. |
05-07-2021, 12:49 PM | #8 |
Registered User
Join Date: Jul 2015
Location: Sedalia Mo.
Posts: 1,130
|
Re: Radiator hose ID
A quick web search for "3947120 radiator hose" yielded this hit from Classic Industries
https://www.classicindustries.com/product/3947120.html What engine do you have? FYI, Apparently the 1967 327 uses a different inlet hose. I have not bought from these folks, but the google search yielded many more hits besides the above. The same search with "3918487" that 1970cstblazer supplied shows many hits too, but they don't look to be as "S" shaped as your...hmm?
__________________
He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20 |
05-07-2021, 03:36 PM | #9 | |
Registered User
Join Date: Jan 2018
Location: Lemoore, CA
Posts: 74
|
Re: Radiator hose ID
Quote:
I’m down right now with medical issues so the hubby is gonna try a different parts place on his day off next week. Fingers crossed and if it doesn’t work I’ll definitely be using those searches above! Thanks! |
|
Bookmarks |
|
|