You say that it does not turn over, how would you know there's no compression if it don't turn over, unless you mean if won't start up, lets go with it won't start up, if you have no compression, did you bleed down the lifter's, if you did not, with the lifter pump up will hold the valves open and you will not have compression, will be very hard to start engine, remove lifter and bleed them down, also make sure you replace the oil just in case there's water in the oil pan when heads were removed, if there is water could lock engne, now you would need to overhaul lower engine, hope this was very helpful.
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