PRESSING THE OIL PUMP PICKUP INTO THE OIL PUMP (Page 2/2) La fiera MAR 09, 10:36 PM Another area where you should pay attention is on the inside of the pump. These pictures are before and after blueprinting my oil pumps. 1st thing is, get the 3.4 pump because it has a bigger diameter pick up tube. Once you've made that choice disassamble the pump and open the passeges to match the tube. On the exhaust side of the pump also do the same. Because of the restriction on the pumps due to poor casting design, if you look at the pictures the unported pump inlet (picture 3) makes the pump prone to cavitation. By doing this mod on the pump you'll increase the pump's volume drastically. The other area where you can save a couple of ponys is on the gears. A stock pump feels draggy if you turn it by hand. If you take it appart and massage the gears with emery cloth to make them shine and then put them together, you'll feel the difference when turning it by hand compared to the stock pump. Since I make all my power NA, every little bit helps! Cheers!