One thing you need to consider is the depth of the portion of the stem that clamps onto the steer tube. This depth varies from stem to stem. You bike probably has a stack of aluminum spacers underneath the stem. You might need to remove a spacer or else replace one of the spacers with a thinner one. Bike shops sell steer tube spacers in all sorts of thicknesses. Make sure you mention it's for a 1" stem. When I set up my bike, I like to leave a couple millimeters clearance between the top of the steer tube, and the top of the stem. This way I can tighten down the steering assembly without bottoming-out on the steer tube. Depending on the depth of the stem, I'll sometimes put one spacer above the stem. This way the steer tube fully engages the stem, and I can still compress the steering assembly.

p.s. I recommend you get yourself a cheap plastic vernier caliper for measuring spacer thicknesses. It's also useful for figuring chainline, and about a thousand other things. I've found this tool to be absolutely indispensible.