[Towmaster]

Make sure there is no air gap between your fan shroud and the radiator. If there is a gap there then air will pass through it rather than be sucked through the radiator, therefore decreasing the effect of your thermo fan. You can buy adhesive rubber of varying thicknesses from Clark rubber. This is perfect for sticking in any gaps between your fan and the radiator. These little 5% differences really add up...... Having said that my LS sits around the 200 - 210 mark in racing situations.