I replaced all the rubber peices that connected to the plastic vaccum lines. 5/32 standard vaccum line fits nice and tight. I found that the vaccum line I used was quite a bit thicker than the stock molded vaccum hoses so making 90' bends was no problem. I noticed quite a few of the vaccum fittings were loose on there nipples. I also pulled apart and lubed all my throtle linkage at the same time. I don't think that has ever been done.