ok so im puttin my engine back together and noticed my vaccum ports are all plugged and corroded on my 13bt engine. I already used gm top engine clean on all the ports on my manifolds and was wondering if when i get it running if i could use a vaccum system clean on a rotary or would the cleaning harm the oiling of the apex seals. Anyone who ever uses the vaccum clean on any 3 step fuel system cleaning like wynns, bg or valvoline should know what i mean