Enrique,
This is normal. When the pistons get to the ends of their travel, the crank
moves several degrees with little to no movement from the pistons, and
therefore less drag from the rings against the bores. When the pistons are
in the middle of their travel any movement by the crank results in a movement
in the pistons, and more friction. If you have not yet put the head on watch
the pistons while you turn the crank, you will find that near TDC the piston
movement is less and it is way easier to move the crank.
Hope this helps,
Rick
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