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78 overflow tank

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Old May 1, 2006 | 09:28 PM
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Default 78 overflow tank

Anyone have any problems with your overflow burping in heavy cornering ? For instance the other day I took a exit ramp a little on the quick side and it spit up all over the headers more annoying than any thing else I guess not a major problem but I would like to correct it . Is the cap on the over flow suppose to have a check valve or something ? Any mods for this
Thanks in advance John.
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Old May 2, 2006 | 04:57 AM
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Originally Posted by 78 Vette
Anyone have any problems with your overflow burping in heavy cornering ? For instance the other day I took a exit ramp a little on the quick side and it spit up all over the headers more annoying than any thing else I guess not a major problem but I would like to correct it . Is the cap on the over flow suppose to have a check valve or something ? Any mods for this
Thanks in advance John.
Most unusual. It shouldn't be that full that it can easily burp out on a corner. Is it overfilled? Should have some embossed lines that say "cold" and "hot"
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Old May 2, 2006 | 07:03 AM
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Not to mention the cap that's supposed to be on it. A black thingy with holes on the side?
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Old May 2, 2006 | 10:35 AM
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The cap is on. The black thingy with the hole's in it. And the level is perfect.
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Old May 2, 2006 | 02:47 PM
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Mine does too. Real pain when autocrossing, everyone says "hey, your car is leaking antifreeze". I put aluminum foil inside the cap, poked a little hole in it for air, then screwed the lid back on. Doesn't do it any more.
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Old May 5, 2006 | 03:05 PM
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Good idea I think I will do the same. That drives me nuts when people tell me that to.
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Old May 5, 2006 | 03:15 PM
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New plastic cap= about 8 bucks...solved my 78 burping...

Last edited by rihwoods; May 5, 2006 at 03:22 PM.
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Old May 5, 2006 | 05:53 PM
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Is there some sort of check valve in a new one mine just has a hole
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Old May 5, 2006 | 06:29 PM
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Mine does exactly the same thing. My overflow tank is exactly at the correct level and the cap is on, but has a spill off there designed to allow it to blow off. If I take a HARD corner it will spill out a bit and splash on the headers and a nice smelling cloud comes out. I have been thinking of plugging the blow-off hose part of the cap or else stop taking corners at 5 G's.
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Old May 5, 2006 | 10:07 PM
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Thats the best part about owning a corvette taking corners at 5 G's.
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Old May 5, 2006 | 10:14 PM
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Originally Posted by 78 Vette
Is there some sort of check valve in a new one mine just has a hole
No hole...expansion takes place within tank...
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