I have a 2005 Aveo with 112K hwy miles and had the idler pulley break which jammed in the timing belt and it stripped. Bent all the exhaust valves, so I had the head at a machine shop for a valve job and new valves. I installed new water pump, idler pulley, tensioner and belt. I was told by the machine shop that the hydrolic lifters take some time to settle in and don't be alarmed if no compression in the begining. The car wont start, just cranks over. Ran the battery down twice. I triple checked the timing marks as far as shinning a light on a straight edge to see the shadow on the marks and are perfectly in line with the sprocket bolt centers. The fuel rail has preasure and the engine has done maybe one or two backfires. All the connections are accounted for and, well, I'm out of ideas. Any suggestions?Thanks.....