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Expansion tank question?

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Old Oct 23, 2009 | 12:00 PM
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Default Expansion tank question?

I have a 1970 L46 350/350, no A/C. I have no expansion tank, did this model come with a aluminum Harrison expansion tank? If so, does anyone have pictures of it location and hose route setup.
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Old Oct 23, 2009 | 12:07 PM
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I'm pretty sure all early C3s had an expansion tank.

Your best bet is to buy an AIM (assembly instruction manual) to see how mounted and hose routing.
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Old Oct 23, 2009 | 12:27 PM
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No, it didn't. My '70 350/350 with no A/C had the "dimples" in the glass where the tank would go, but no tank was ever installed.
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Old Oct 23, 2009 | 12:37 PM
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Originally Posted by SS Racing
...I'm pretty sure all early C3s had an expansion tank...
Nope. It varied per radiator application. Usually, cars with the 4 row Harrison copper radiator did not get expansion tanks.

...Your best bet is to buy an AIM (assembly instruction manual) to see how mounted and hose routing...

Carefully reading the AIM will also let you know whether your particular radiator got the tank.

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Old Oct 23, 2009 | 01:12 PM
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Originally Posted by toddalin
No, it didn't. My '70 350/350 with no A/C had the "dimples" in the glass where the tank would go, but no tank was ever installed.
Same as mine. If I want to keep it original, what is the correct overflow hose from radiator. Looked at Doc Rebuild - but all overflow hoses go to the expansion tank.

Thanks for all the replies.
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Old Oct 23, 2009 | 01:31 PM
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This has been debated. I've seen both with & without expansion tanks.
Without:

With:

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Old Oct 23, 2009 | 01:33 PM
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[QUOTE=GD70;1571916305]This has been debated. I've seen both with & without expansion tanks.

With:

QUOTE]

Hey, that's my engine! Thanks for posting!!
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Old Oct 23, 2009 | 01:56 PM
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[QUOTE=RMVette;1571916330]
Originally Posted by GD70
This has been debated. I've seen both with & without expansion tanks.

With:

QUOTE]

Hey, that's my engine! Thanks for posting!!
I couldn't remember who's it was! I while back I requested pics of L-46 engine bays so I could get mine back to the way it should be, and filed all the pics posted for my reference.
Glenn
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Old Oct 23, 2009 | 02:39 PM
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Here's another one:



Robert
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Old Oct 23, 2009 | 02:54 PM
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GD70 is correct. This has been hotly debated. Do a search on the NCRS site for a lot of information.

The 69 Judging guide says they did come with the expansion tank for '69, but upon further review it's been established that quite simply, some 350 hps came with the aluminum radiator, which in turn came with the expansion tank, and some 350 hp cars came with the copper radiator, which came with no tank. I've seen examples of both. Heck, I've OWNED examples of both!
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Old Oct 23, 2009 | 02:58 PM
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A '69:

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Old Oct 23, 2009 | 03:07 PM
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My 69 came without. The glass was dimpled in the normal spot for where the tank goes, but it was never drilled for the tank mount.
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Old Oct 23, 2009 | 03:21 PM
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It's very simple: No Corvette came with more than one radiator cap. No Corvette came with less than one.

Pre -'73 Corvettes:

If your radiator has a cap, you don't need an expansion tank. If it doesn't have a cap, you need an expansion tank.

'73 and up Corvettes did not have expansion tanks, only coolant recovery tanks. Different animal.
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Old Oct 23, 2009 | 04:10 PM
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Originally Posted by Mike Ward
...If your radiator has a cap, you don't need an expansion tank. If it doesn't have a cap, you need an expansion tank...
That works.
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