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The springs used on the 6X heads are Wolverine VS1524 and feature 1.650-inch installed height, 125-lbs pressure seated, and 280 lbs at .500 lift. The retainers and keepers are stock. On the aluminum heads, Crower 68405 springs were set to a 1.700-inch installed height with 115-lbs seat pressure and 310-lbs open pressure. Retainers and keepers are 10-degree pieces from Comp Cams.