For what you're doing, you'll never know the difference. If you just want the 1.6, get them. They'll work good. Just make sure the assembled spring height can take the extra lift at the valve the higher ratio generates. Also another thing to watch out for is the pushrods hitting the heads in the pushrod holes. The increased ratio rockers move the pushrods closer to the rocker shaft to achieve extra lift. Sometimes you can run into clearance issues at the pushrod holes if they are small.