ORIGINAL: proptop
It could be you're just feeling the "pinch" of the tapered bore sleeve. The piston gets to a tight spot as it gets toward the TDC (Top Dead Center ) position.
If you take the glow plug out and pull the engine over slowly, how does it feel?
when i take the plug out and pull it, its very easy to pull. so what i am experiencing is normal? or just for a new engine?