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Discussion Starter #1
I have a 98 GT. When I got it the motor was shot so I swapped it with a 98 Expedition 4.6L, after swapping many items from the Mustang motor. I put the PI intake and used the gaskets that I had for the PI intake but I think this is where my issues start. I got it running and now it is leaking water pretty bad on the back side between the motor and trans. I can also see the antifreeze pooling around the front of the right bank by the mating surface of the intake and head. When I put the gaskets on I had to break off the alignment pins on the gaskets so that it would go on there. Is there anyone that has done this as well or am I screwed and have to use the intake from the Exp engine, which causes more issue for hoods and such. An help would be appreciated as I am beyond frustrated at this point.

Jeremy
 

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Are you using NPI or PI intake gaskets? You should be using PI gaskets with a dab of silicone around the water ports because they don't match up perfectly. Using NPI gaskets is a sure way to get a coolant leak.
 

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Discussion Starter #4
That is sound advice. I was using the PI gaskets but no silicon. I will give that a shot. Thanks for the advice. More to come.....
 

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I just reread, and I would say your leak could actually be coming from the coolant nipple under the intake manifold. If you look into the valley, is there a pool of coolant in there? Although my bet is still on the intake gaskets. When you use PI gaskets on NPI heads, you have to put a dab of silicone around the coolant passages.
 

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Discussion Starter #6
It was actually the heater core hose that runs in the valley that had a pin hole in it. I replaced it and now that situation is fixed. Thanks for all of the help guys.

Jeremy
 
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