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Discussion Starter #1
Last night I got a new program from RobertP and he requested that I go out and dog the car to see how it runs. It runs great, but by the time I got back to the house I was leaking coolant from the overflow reservoir because there was too much pressure. Rob says that most likely this means I have a blown head gasket. I was just wondering if anyone can explain how a blown head gasket causes excessive pressure in the cooling system? I thought a blown head gasket would leak coolant or oil from around the head gasket? Also I am about to get in the car Friday morning and drive 8 hours to the Joel Bender Memorials in WV and want to get second opinions on the risk of this. Rob is telling me that it will be no problem and the only time that I may leak again is if I run back to back runs at the track, but the car could very well continue like this for years without a problem. In case you didn't see my sig I am running the SVO blower on an otherwise stock and all original NPI motor with 119k miles. The blower has been on since about 99K miles. Any feedback would be greatly appreciated.

Robert,

If you see this I will give you a call later with an update after what you requested me to do last night.

Thanks,
Kevin M
 

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If the head gasket fails between a coolant passage and one of the cylinders (very common) the engine will be shoving air into the cooling system with each compression stroke.
You should watch it as it sits idle and see if you have bubbles coming up constantly. If so then you probably have a blown head gasket. If not, it may just be overheating.
 

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Discussion Starter #3
That makes sense. I think form the way Rob explained it, it is only something that is happening when I hold WOT for awhile. The seal is just not tight enough to hold down the head, so it lifts the head and allows that air to leak to the cooling system. I will check for bubbles at idle, but I do not think that is happening, so that tells me that I should be safe to drive on the interstate at normal speeds, I just can't dog it too much. I guess the blower adds just enough pressure to cause this to become a problem.

Thanks,
Kevin M
 

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I believe ford had crappy bolts from 96-98 my orginal motor never had this problem and it was a 95 and the motor is still but wires 98 had this trouble and the head was flat and I've replaced the gaskets and bolts no problems know

Robert
 
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