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First of all, what engine do you have? Were the heads resurfaced? and hopefully not on a belt surfacer, longitudinal gouges in the surface is a sure way to tell.
If you have a 5.0, they do crack externally along the lower head bolt boss area, but it is rare, however it happened to me, a 12 inch long crack. what did you torque the bolts to and what brand head gaskets?

 

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well the holes in the block do go thru to the coolant passage, try removing the bolt and reinstalling it with non-hardening permatex,silicone will never set up.
But i torque them to 80.Fel-pro i believe,recommends 80 on long bolts, 65 on shorter outers however i have heard people experience trouble with the 65lbs on the outers.
Drain some of the coolant first though/wwwthreads_images/icons/wink.gif
 

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I would just go back and retorque them all to avoid possible future problem,since you all ready have a leak right off the bat,but its up to you. Just go back and check your brothers work/wwwthreads_images/icons/tongue.gif,put the sealer on just that bolt.
Permatex and silicone are two different products, i wouldnt recommend silicone because it may not {cure}, down in the threads.
 
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