Hi, I bought a 99 model 3165 that had a blown 16hp Briggs engine. I bought a new motor but the manifold vacumn port is drilled but not all the way through. The old motor is drilled through on one side of the intake and had a barbed fitting. The vacumn runs the blade engagement idler pulley so I have to have it. Is the vacumn port a CC factory spec and not on a standard production motor? I matched the model number before I bought the motor. Anyone ever run into this before? If I drill it out is there an easy way to remove the chips? (I don't want them to get sucked into the cylinder) I know I can remove the intake manifold and don't think there is any other way to be sure of removing the debris. Any thoughts or suggestions would be appreciated.