i have stage 2 comp cams (made for focus blacktop in america) in my 2.0 silvertop and they've been in for about 6 years with no problems.

i went for the comp cams because they are made to go straight in, whereas crane and crower cams from usa need some grinding even to make them fit a blacktop. i dont remember the technicalities behind this before anyone asks, nor do i care