"If i do it that way the fresh air into the valve cover can be filtered"

wrong, any line from the valve cover to the air cleaner will be drawing air out of the valve cover

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics