First of its kind- 87 442 Official Home-made Repro Upper/Lower Coolant Hoses


Supporting Member
Jan 2, 2006
I present to you my first set (and probably the first set anywhere) of Oldsmobile G-body repro coolant hoses...

I used Dayco 71625 upper hose, since it mimics the original shape of the GM 22527800 hose the best. The lower hose is Continental 6110 hose. It's not exactly the shape as the old one because it doesn't have a pronounced "bell" on the water pump end on the GM hoses, but is a bit thicker than the general run of hose. Once in place, I believe it will do an ok job.

I used the same codes to make the stamps as was on the original hoses. Although I didn't spend the coin to make a separate code for the lower hose because one number/letter was a "C" instead of a "B" so I left that as-is. And if I didn't tell you, you probably wouldn't have even known. There seems to be 40 different hose variants out there between 82-88. Again, this is based on a low-mile original hose set from an April 87- built 442 in the Pontiac plant. Your original hoses may differ.

They're not perfect, but this is one area where you don't have to be. Besides, like other details, likely only a handful of people will ever notice or even care. I used white archival ink for the stamps, and although slow to dry, once it does, it very well seems permanent. I've been keeping my test hose out in the weather rain or shine, 93 degrees F to all sorts of rain, and it's holding up extremely well. I guess we'll see when 195 degree coolant goes through these things. I expect that to not be an issue.

Here's the aftermarket hoses I started with-
New hoses for repro project.JPG

Here's the OEM hoses
OEM 87 442 hoses.JPG

Lower OEM hose, barely readable codes, but they're there.
Lower OEM hose code stamps.JPG

OEM upper hose codes- note how the codes bend and barberpole wrap around the hose as it was formed. That was a PITA to replicate.
Upper OEM 87 442 hose codes.JPG

And now for the comparison-the newly finished reproduction hoses. The lower hose has a blue paint dot from the factory. I left it.
Repro 87 442 hoses.JPG

Repro 87 442 hoses 1.JPG

And Repro vs. OEM comparison
Repro hose v OEM comparison upper 1.JPG

Repro hose v OEM comparison upper 2.JPG

The length on the repro hose may be a tad longer and need trimming. It appears longer than OEM. But as always, it won't get trimmed until needed.
Repro hose v OEM comparison upper 4.JPG

Repro hose v OEM comparison upper 5.JPG

Repro hose v OEM comparison upper 3.JPG
Last edited:


Royal Smart Person
Jun 6, 2014
Houston, TX.
Great job!


Master Mechanic
Feb 15, 2015
SW Michigan
Thanks for the info...putting a SBO stroker in my 84' Hurst next month if I get the engine Was wondering on my hoses like you said there are several configurations


Supporting Member
Thread starter
Jan 2, 2006
Thanks for the info...putting a SBO stroker in my 84' Hurst next month if I get the engine Was wondering on my hoses like you said there are several configurations
Your 84 should have the same p/n lower hose (yellow or white striped), but the upper should be 22505694 to be factory correct, likely with yellow stripes.
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