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This is a GN1Performance "PORTED CAST IRON HEADS" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. The heads feature a 170 stainless valves and exhaust are 160. They have new keepers, EGR filled for delete, new retainers, and new springs for a roller or regular hydraulic cam.
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