when installing a pcv in an older unit you are creating a vacum leak so be shur to size the valve to the engine and you have to tap the intake vacum for pcv and you will have to close all external such as road draft and VC use only pcv to control engine preasure,,tap valve into VC and install baffels to control oil loss thru valve..you can install intake line to air cleaner from VC to help you will also have to baffel to control oil loss but I don't think this is a must...doc