Over the last two weekends we have been assembling and installing my motor. Tonight we tried to fire it up for the first time. It acted like the timing was advanced. It would be turning over two or three times fine but then it would start to crank hard like the timing was advanced. I set the cam sensor with Caspers tool while on the engine stand.It has a Comp Cam 212 that is set at zero on the timing chain. We thought it may be 180 degrees out. So we pulled the cam sensor out and reset it with the cam tool 180 degrees out. But it still did the same thing. I also tried changing chips, but still had the same problem. As far as I can tell every thing timed at zero. We pulled the valve cover on checked top dead to the balancer, again everything looked fine. Are we just over looking something or is something wrong? Before the rebuild I ran both chips (Lubrant and Reds) and everything was fine. Is it to much to ask to have a good running T/R with out a million headaches?