I did a top end rebuild on my 02 FLHTC with 87k miles. After reassembly I heard a noise that sounded like tappets. I removed the front rocker box cover and started the engine. It wasn't the tappets, but pulsating air from the breather valve. It was very loud. These are the newer style breathers that came in the gasket kit I bought from the dealer. They are metal, the old ones were plastic. So my question is, is this normal, or did I perhaps install them incorrectly?