The reason being the air is entering through the valve cover front pipes and going though the heads and down. Normally air is pulled from those spots. But since you are pressurizing the part of the system that is normally under vacuum (the intake pipes) it will pressurize the oil pan as well.
JackB nimble JackB quick JackB can suck my dick =P - james-lee 11/02/01 Arrogance is the #1 weapon against Supra Owners - MikeH 08/06/02 Dallas with a Z: I like the bulge dude 05/02/03 Bezbefootball: Does dick have anything for me? 10/21/03