Engine Intake ManifoldEdelbrock part #75163 RPM Air Gap intake manifold is designed for 262 400 c. i. d. Chevy V8's with 1996 and later Vortec (L31) cast iron or Edelbrock E Tec aluminum heads. This intake manifold is based on the powerful Performer RPM Vortec #7116. 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. An external water bypass boss is machined into the front of