Based on the powerful Performer RPM Vortec #EDE7116, this single four-barrel intake is designed for 262-400 c. i. d. Chevy V8s with 1996 and later Vortec (L31) cast-iron or the new Edelbrock E-Tec aluminum heads. The RPM Air-Gap manifold delivers outstanding performance using the same air-gap technology found in our race-winning Victor manifolds. This unique design separates the hot engine valley from the air/fuel mixture for a cooler, denser charge and more power throughout the rpm range. An external water bypass boss is machined into the front of the water crossover for use on 1996 and later Vortec production engines. Includes rear water outlets, nitrous bosses, a temp sensor boss that clears all waternecks, two distributor clamp locations and a heater outlet boss that's angled for proper fit over the valve cover. Accepts 1976 and later alternator and air-conditioning brackets for street installations. For square-bore carbs. No provision for exhaust-heated chokes and no exhaust crossover. Will not fit under stock Corvette hood.Installation Notes: Recommended intake gasket: GM #12529094Pit Stop USA offers Edelbrock Performer RPM Air-Gap Intake Manifold - SB Chevy - Polished - Vortec (Non-EGR) 75161 at low everyday prices. Be sure to check out all of our products from Edelbrock including Edelbrock Intake Manifolds - Small Block Chevy.