97gti5

Hi guys,posted this thread yesterday but disappeared when I went to check it! Got a pair of 136ps cams for my 3door Escort GTi,and was wondering if they simply drop in place of the old ones,or am I going to have to do the cambelt at the same time? Ive got the 2.0 pre 96 ECU,TB,MAF,inlet and fuel rail,but wanted to know if putting the cams in alone for now is going to have any undesired effects,or will it just run as normal?? Help from any1 who has had cams alone in their 1.8 zetec would be greatly appreciated!