For many 4, 6, 8 cylinder engines 2.3L 2.5L 3.0L 4.3L 5.0L 5.7L 5.8L, 7.4L, 8.1L 1994 and newer
Early production 5.7 liter GM based units had a "lump" in the bellows, later production models did not have a "lump". Look at your bellows before ordering.
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