Designed for street and high performance 351-400+ c.i.d. 351-W Ford V8s, the RPM Air-Gap incorporates the same race-winning design that’s been used on our Victor Series competition intakes for years. 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. Larger cross sectional area and a taller carb flange than #7181 for compatibility with large displacement, stroker 351-W based engines. Includes nitrous bosses. No provision for exhaust heated chokes and no exhaust crossover. Aftermarket 4-bbl carbs are not compatible with Ford Auto Overdrive Transmission (AOD) unless used with Lokar bracket SRK-4000.