LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Coolant Shooting Out Radiator

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Old Jun 23, 2009 | 09:50 PM
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Question Coolant Shooting Out Radiator

I just put a 383 in my T/A. everything is brand new in the motor... my heads had small cracks in them when the machine shop checked em and they welded them up... i been having problems with it running hot... well i figured i would drive it down the road today... when i came back it was blowing out antifreeze... so i took off the cap and cranked up the car... its blowing antifreeze out the radiator till its empty. i fill it up and it blows right back out... what do any of you guys think is the problem??
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Old Jun 23, 2009 | 09:54 PM
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poss airbound ,are ya tryin to fill it still hot? let it cool fill it as much as poss then crack bleeders till coolant comes out steady then refill rad run wit cap off for a while "norm when ya get good heat ya can cap it" then run it see what it does
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Old Jun 23, 2009 | 10:06 PM
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ive done that. and it just blows right back out... the water just sloshes out..
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Old Jun 23, 2009 | 10:51 PM
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Originally Posted by Black96transam
. i fill it up and it blows right back out... what do any of you guys think is the problem??
How much coolant are you using to fill up? The coolant system holds approx 16 quarts.
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Old Jun 23, 2009 | 11:06 PM
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i'm not sure i use a half a gallon of antifreeze and i open the bleeders and fill it up till water is running out the bleeders i keep the flow of water going and i close the bleeders... crank it up and then here comes all the water right back out... it looks like when you hold a water hose straight up and turn the water on and it just pushes out... thas what it looks like.. and its got alot of pressure on it... i'm thinking head gasket or the machine shop didnt weld the crack up good..
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Old Jun 23, 2009 | 11:37 PM
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sound like exaust gases pushing threw aka bhg get a tester and test the coolant for exaust gases
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Old Jun 24, 2009 | 01:33 AM
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Originally Posted by Black96transam
i'm not sure i use a half a gallon of antifreeze and i open the bleeders and fill it up till water is running out the bleeders i keep the flow of water going and i close the bleeders... crank it up and then here comes all the water right back out... it looks like when you hold a water hose straight up and turn the water on and it just pushes out... thas what it looks like.. and its got alot of pressure on it... i'm thinking head gasket or the machine shop didnt weld the crack up good..
I hate to say it, but if the agitation is that bad especially during a cold start up then most likely cylinder pressure is getting into the cooling system.
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Old Jun 24, 2009 | 08:35 AM
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Originally Posted by SS RRR
I hate to say it, but if the agitation is that bad especially during a cold start up then most likely cylinder pressure is getting into the cooling system.

yep....
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Old Jun 24, 2009 | 06:18 PM
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thanx guys... machine shop said its a posibility they missed a crack.. they want me to bring in the heads and let them check em... if they messed up then we gonna have a talk about them paying for new gaskets and labor...
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Old Jun 24, 2009 | 06:47 PM
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You're a better man than I am for reusing "fixed" aluminum heads. F that.
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Old Jun 24, 2009 | 06:55 PM
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haha. i wanted to get by for a lil till i could get some A.I or Dart heads...
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