Designed for Ford 429-460 street and high-performance applications with standard or Cobra Jet cylinder heads. The Air-Gap design features an open air space that separates the runners from the hot engine oil resulting in a cooler, denser charge for more power. This manifold is designed with a larger cross-sectional area (3.3 square inches) than Performer RPM 460 intake manifold #350-7166 for more gains with high-performance and large displacement engines. The carb mount flange accepts both square-bore and spread-bore carbs for Cobra Jet applications. Will not fit 1988 and later models.