Engine - Cylinder Heads - Signature Series Racing Bow Tie Cylinder Head 1965-96

From GM Performance - This aluminum Bow Tie cylinder head offers a significant performance improvement over production castings. Bow Tie heads are recommended for large displacement competition engines 1965-96 Mark IV, Gen V and Gen VI. The Bow Tie head's intake runners are rasied. .100 inch above the standard port location and enlarged to improve airflow.