Valve Cover Mods
Also, the two breathers on the passenger side; are they necessary? And what is the 1" hole in the rear of the drivers side cover for? Oil return of some sort?
Pat
Is it worth the upgrade?
You need at least one of the vents on a valve cover to let air into the crank case, otherwise the vacuum has nothing to pull into the PCV. Some people use a breather cap on the oil fill. Using the vent on the valve cover into the valve body provides a sealed system though.
Pat



