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ls vacuum quest unknown hi i am a new ower of a ls vette cpe it has a hp with k miles the previos ower changed the cam put on a holly double pumper he said due to the cam they had to remove the a c unit an add a belt driven vacuum pump in addition to the mechanical vacuum they added a electric one as well is this normal i want to re install the a c unit but i need the vaccuum for obvios reasons how do i know how much vacuum is enough also i am trying to find the fan belt illustratation or could some describe the belt order from the crank i have three pullys on the crank wheres a good pleace to buy the upper radiator hose any and all input is welcome thanks mas