I have a 2002 Oldsmobile Aurora with the 3.5 liter engine. I have head gasket failure. Leaking coolant and it failed the exhaust in the coolant test not to mention bubbling in the reservoir tank. I have both heads off already. All bolts were tight and no aluminum came out on the threads of any of the bolts. My questions is should i time seat the head bolts holes in this case? I'm not really wanting to spending the money for the kit I will use 1 time. What's the general thought on this?