Edelbrock part #7566 RPM Air-Gap 460 intake manifold is designed for street and high performance 429/460 c.i.d. Ford V8s with standard or Cobra Jet heads. The RPM Air-Gap 460 incorporates the same race-winning design thats been used on our Victor Series competition intakes for decades. 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. It also features a larger cross sectional area (3.3 square inches) than the Performer RPM 460 manifold #7166 intake manifold for even more power in 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. Note: Early Cobra Jets came with Quadrajets.