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The GNX was introduced in 1987 as a limited-edition, higher-performance edition of the Buick Grand National. Buick produced 547 GNX models in 1987, a small number compared to the 20,193 Grand Nationals produced that same year.
1987 Grand National Gnx >> 1987 BUICK GRAND NATIONAL GNX - 189534

1987 Grand National Gnx >> 1987 BUICK GRAND NATIONAL GNX - 189534

This is a "Camshaft Button" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. This is highly recommended to change out on every camshaft, this is a needle bearing button where as the factory button is a plastic piece.
1987 Grand National Gnx >> 1987 BUICK GRAND NATIONAL GNX - 194306

1987 Grand National Gnx >> 1987 BUICK GRAND NATIONAL GNX - 194306