The Edelbrock RPM Air-Gap 460 #7566 intake manifold is designed for street and high performance 429/460+ c.i.d. Ford V8's with standard or Cobra Jet heads, the RPM Air-Gap 460 incorporates the same race-winning design that’s 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.