The Zetec is very much like a solid lifter motor. The cams push on a bucket which directly moves the valve. Its a little noisy because of this. When I installed my crower cams, I had to change the thinknesses of a few of the buckets. Some of them were on the loose side when I checked clearences. It was even more loud because of it. There is no adjustment that can be made except actually switching the "lifters" or in this case buckets.
Hope that helps,
L8r
BJ
[ 09-23-2002, 06:03 PM: Message edited by: CasperSE+ ]