I am going to replace the faulty valve stem seals on my '96 4.6 soon, and was wandering if anyone has ever done this before? The engine is in the car. My major concern is, do I have to remove the camshaft "ladder" caps to use the spring compressor? Looking at the head pics I took when i had my RH valve cover off, it doesn't look like the spring compressor will work with the caps in the way. I have access to the spring compressor and spring spacer. The ford factory manual doesn't say anything about removing the caps. Anyone else ever done this before?