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One bummer about the Rat is that we had to change valvesprings to Crane 99839s to accommodate the cam lift; those are single-style springs that do not require machining. Both the big- and small-block can usually handle up to 0.500 lift with good stock springs, and we got away with the stockers on the 350 thanks to the 0.465/0.488 lift. All the cams with less than 0.500 lift were too weenie for the larger displacement of the big-block, so the springs had to be changed. We also had to buy one new retainer.