It depends on what engine size your car is for starters.
Then there is a correct sequence to un-do headbolts then a correct sequence to tighten them up. Then correct torque wrench settings. Then you will have to replace timing belt and make sure it's timed up correctly.
I can supply all the ifo you need just need engine size. If you want diagrams etc of timing belt email me at
moira@bennett8377.freeserve.co.uk
chris, December 2005