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What could cause a rebuilt engine to still burn oil?

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When you put the piston rings in several are oil blockers - these make sure the oil doesn't pass them into the combustion chambers - there are gaps on each ring. - you must be 100% sure these gaps [ every other one ] are 180 degrees opposite each other. If not - this allows oil to bypass these small gaps and into the combustion chambers. The only real fix for this is to remove and replace the rings. Also if you didn't replace the valve guides - there are usually rubber caps that can dry out and shrink if off the car out of oil for even a little while. Last but not least check your oil pressure and make sure it is proper poundage - an over pumped system can allow this. Now for the real deal and final part of my answer - the cylinder walls can be warped from over heating or even just age.

Well hope this helps. Riceski

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What would cause a new engine to burn oil?  You just rebuild the engine and why does it still burn oil?