Leaking intake gaskets is a common problem with these engines. What concerns me about your leak is that coolant was found in the lifter valley and you heard a lifter rapping. This tells me that there is probably coolant in your oil and it probably circulated through out the oiling system.I would change the oil and change it after only 50 miles again;to be sure most of the coolant is gone out of the oil.
New gaskets will solve this problem if it is indeed the gasket. It can't hurt to do a leak down test to be sure a head is not cracked or a head gasket is not to blame. And if you have the ability, once the intake is back on, pressure test the radiator to see if the block itself is cracked. But coolant in the lifter valley is usually a bad intake gasket or head gasket. Let me know how you make out.
Use the fel-pro intake gasket kit these seem to be the best
Saturday, December 1st, 2007 AT 11:30 PM