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Old 06-12-2019, 06:37 AM   #1
teamo
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thermostat water outlet bolts

1975 corvette. Are any flat or lock washers used on the thermostat housing bolts? The AIM did not show the bolt detail.
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Old 06-12-2019, 08:06 AM   #2
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1975 corvette. Are any flat or lock washers used on the thermostat housing bolts? The AIM did not show the bolt detail.
You can if you want to.
Or use a small hardened steel flat washer.
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Old 06-12-2019, 05:50 PM   #3
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I know that I can use a washer but I am trying to do it as it came from the factory. I was justs wondering if anyone knows if it came with washers from GM.
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Old 06-12-2019, 10:02 PM   #4
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I know that I can use a washer but I am trying to do it as it came from the factory. I was justs wondering if anyone knows if it came with washers from GM.
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I have seen them with washers and without.
Try Google searching images.
Type in what you want end with images.
Pictures come up others posted.
I do that often to find out myself what was correct day 1.
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Old 06-12-2019, 11:01 PM   #5
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Here is a photo of the original engine out of my 1970 Corvette. It had about 68k original miles on it when purchased, it was the base 300hp 350 engine. I have no reason to believe this has ever been removed from the cast iron manifold.

Hope this helps....
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Old 06-14-2019, 06:48 AM   #6
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Looks like the '70 had no washers so they probably stuck with that going forward. I have seen some of them with one stud and one bolt as in 7Troadster's picture. What is the purpose of the stud there doesn't seem to be anything that bolts on top of it?
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Old 06-15-2019, 09:42 AM   #7
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I looked through the accessories section of my AIM and it shows the smog pump mounting in that area. It's likely a bracket mount for the pump, which back then would have been CA cars only.

Alternatively, I have seen other Chevy's with hose/wire loops mounted there.
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Old 06-15-2019, 10:36 AM   #8
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I think you're onto something with the stud. I think the smog hose went over the top near the water outlet and over to the left side exhaust manifold in the early years.
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