Q: Blown head ?

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I'm loosing coolant from the resivor having to add from the minimum amount to full line about every 2 weeks, a little white smoke from exhaust here and there not huge clouds but enough to see it's there. I was told I have a minor leak on the valve cover not sure what one specifically and was told I have too much holes in exhaust as well as a bad catalyst converter and o2 sensors. I'm not sure if I have a blown head or not. I check the oil and coolant constantly both look fine. I've had this truck for only a few months and it ran fine no loss of coolant and no smoke but when I changed my coolant and oil at dealers a few days later these symptoms starting happening. Please help.
My car has a manual transmission.

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