Vintage Buick Nailhead Engines - Buick Nailheads
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Identifying Nailheads is easy: If it has a left-side starter and a rear-mounted distributor, it's a Nailhead. They all look alike, but you can tell a 425 from all others by this 425-only, cast-in bump (arrow) on the center-left of the bellhousing flange. View Related Article
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