Use open spacers where more plenum volume or more carb-to-plenum floor distance is required. 4-hole spacers enhance low-rpm torque and throttle response and dampen reversion effects on the carb. The superior heat insulating properties of wood fiber laminate are ideal for reducing heat transfer to the carb. Product Features:Provides Superior Heat InsulationIdeal for Reducing Heat Transfer to CarburetorMore Plenum VolumeMore Carb-To-Plenum Floor Distance
