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possible headgasket??

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Old Oct 6, 2008 | 05:03 PM
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Mach1killerls1's Avatar
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Default possible headgasket??

right now im 98% sure i need to do head gaskets but i figured i'd post up here to see what most thought of my situation. car ran beautiful up until i swapped my ls6 intake for my ls1 and then went to a 90mm fast all within 2 weeks or so. after the fast was put on the car didn't run right kept stalling out and as it stalled it would stumble a bit. as it stumbled you'd hear a knocking sound from the passenger side but once started you'd hear it on and off nothing steady and not as loud. once warm it would completely go away.
went to do an oil change one day (didn't have antifreeze in oil) and went to start the car to let it circulate (about a min) and the proceeded to check other fluids. opened the radiator cap and boom the antifreeze came shooting out like if it were overheating. so automaticly i assume head gasket, now i pulled the plugs to make sure no a/f was covering the plugs and sure enough dry as a bone. so now i'm thinking maybe its just a thermostat and bad plugs (2 plugs fowled out) so i changed the plugs and fired it up and still the same thing. now oil pressure is about 45 psi at idle and 60+ at wot and the knock isn't constant so i'd rule out a rod knock. any ideas other then the obvious head gasket???
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Old Oct 6, 2008 | 07:42 PM
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Running lean could be the cause of getting the engine hot, but that hot i don't know about that. Sounds a little extreme for that. My vote would be thermostat. Is it still the stock one?
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Old Oct 6, 2008 | 08:05 PM
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I don't think you need new headgaskets.

When I switched from a LS1 to a LS6 intake on my 5,3 I had to completely redo the idle characteristics. (Given I run OL)
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Old Oct 7, 2008 | 09:34 AM
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it's not overheating it explodes like it is but temp never goes above 160-170 degrees. I was thinking it mightbe a lean knock but I guess I gotta getsomeone to throw it on the compto find out. Any other ideas
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