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When setting up your distributor before firing the engine the first time, you have to make sure the cylinder you are timing off of is on its compression stroke. It can be easy to confuse it for the induction stroke, but that mistake throws the timing way off. One way to check is to pull the valvecover and check that there is lash on both the intake and exhaust valves. If you are on the induction stroke the intake will either be open or not have any lash.