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Set of 12 PAC 1218 springs. This USA made beehive spring is a drop in replacement for 3100, 3400, and 3500 engines, with a 1.700" Install height Drop in with matching retainers for the Gen 2 2.8/3.1 Aluminium head engines, using the same stock 1.700" install height. 3.5/3.9 VVT engines also use these springs, with their stock 1.800" install height.
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