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Some model-4160 Holley carbs use a transfer tube to get fuel to the secondary bowl. This tube is sealed with O-rings that can be a pain. If you spray some silicone lubricant on the O-rings and quickly assemble the bowls, the O-rings should slip right in without pinching. Carefully inspect the O-rings after you've tightened the bowl screws to make sure they're not pinched out.