I will try to make this short but detailed. My tiburon overheated and blew the head gasket. I got the head milled to .007 and replaced the head, intake and exhaust gaskets, thermostat, etc. I made marks for the timing belt, but I didn't get it back together correctly and the timing was way off. It was backfiring out of the intake at first, so I changed it a couple more times. It is starting now and running, but it is making a bit of a knocking noise now when it is running. I checked comprerssion also and the 1, 2 and 4 cylinder were all relatively the same. the 3rd cylinder, however has compression, but not quite as much and it makes a fairly loud hiss out of the top of the spark plug hole when I am checking compression on the other cylinders. The 3rd is the only one that is doing this. Did I damage the valves when I had the timing screwed up and does this mean I get to pull the head off again and replace the valves? That ended up being a little long winded, sorry. Oh yah, this is a 2001 Tiburon. Thanks