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To do the Buick teardown, refer to a good service manual and ask a buddy or two to help out. Doing a head swap requires the front accessory drive, fuel, coolant, exhaust, and intake systems to be removed from the vehicle. Make sure to mark everything as you remove it. Also, a good idea is to take digital photos to make the install easier. Drain the coolant out of the block by removing the lower block plugs to avoid coolant drooling into the cylinders when you remove the heads.