Cut the top third off each head of garlic so the cloves are exposed and wrap in foil. Roast the garlic until the cloves are very soft and golden, about 45 minutes. Cool slightly and then pop the cloves from the skins and finely chop.
Meanwhile, heat the oil in medium skillet over medium heat. Add the pancetta and cook, stirring occasionally, until crisp, about 8 minutes. Using a slotted spoon, transfer the pancetta to paper towels to drain.
Mix together the sour cream and cream cheese in a large bowl until smooth. Add the pancetta, chopped garlic, dill, 1 teaspoon salt and 1/2 teaspoon pepper and stir to combine. Serve with crackers.
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