HELP! i blew something in my motor

Make sure the spark plug is installed all the way. It sounds like it may have popped out.

Head gaskets can "blow" in a variety of areas. Depending on where they stop sealing, the symptoms can be different. If they blow between two cylinders, the symptoms will be a bad miss (2 out of 8 won't be firing) and blowing mixture back into the intake manifold - which throws mixture off for the other cylinders, and makes for a potentially explosive situation. If it blows around a water passage, then coolant can leak into or fill the cylinder; also allows that cylinder to lose pressure - may cause misfire, may not; also may allow the cylinder to pressurize the cooling system. If it blows around an oil return passage - you can get pressurized crankcase, oil in coolant, coolant in oil. There are lots of possibilities - so a bad hg doesn't just have one set of symptoms. But I'd go back to the original procedure - setting the timing PROPERLY shouldn't have caused any issues. Are you certain you timed it properly? We don't know anything about your car other than the compression ratio, it has at least 1 cylinder, and the fact that it will rev to at least 2500 rpm. V-8? 5.0L? aluminum heads or cast iron? efi or carb? Did you have the spout out? With that compression, unless the curve is altered via springs weights or chip, you probably don't want to run more than 12 or 14 initial - what did you set it at? Are you certain your balancer/timing marks/pointer are accurate?