It should tell you in your Repair Manual. Don't have one go [http://www.themotorbookstore.com/land-rover-range-rover-manuals.html Here]
THis ain't no question
manual de torque
You must use new bolts. Torque to 15 lb/ft then tighten each bolt another 90° then another90° starting in the center working your way out on each step
The cylinder head torque settings for a Land Rover 300 DTI starts at 40Nm for all bolts. Then for M10 x 117 mm long 60 degrees, M12 x 100 mm long 60 degrees.
stage1. 20Nm stage2. +180 degrees stage3. +180 degrees.
90 degree is nm
1hz head bolt torque settings
The 2007 Land-Rover Range-Rover has 39.3 in. of front head room.
The 2006 Land-Rover Range-Rover has 40.2 in. of front head room.
The 2003 Land-Rover Range-Rover has 38.0 in. of rear head room.
The 2011 Land-Rover Range-Rover has 38.3 in. of rear head room.