I tell you, having a reference point in the camshaft or in the Cigueñal, the rest is done with typs (corrector) or with a permanent white marker before taking out the bieja strap. Some points of a tooth of the crayfish to a point of the block and from a point of cylinder head to El Piñol of the camshaft, if you carry pump rotates too. You take a strap and put another and all points must match. You are two turns with a key to the whole set to see that no valve sticks and is already done.
Note: If you do not want to do so, look for a program called Autodata, you go out where the draft points are and tell you if you need any users for it.
Be very careful if the crankshaft does not carry shit can you go from the site and roll it.