"The Edelbrock part #7501 from rpm air-gap intake manifold is designed for 1955–1986 262-400 c.i.d. small block chevy v8 applications. in order to separate the runners from the hot engine oil and create a cooler, denser charge for more power, the design incorporates an open air gap. You can Also buy from this link - https://www.totalperformance.net.au/Edelbrock-ED7501-SBC-Performer-RPM-AIR-GAP-Dual-Plane-Intake-Inlet-Manifold-Chevrolet-262-400-Small-Block-Chevy-V8 Teflon tape or paste must be applied to the threads of NPT/Pipe fittings to guarantee a suitable seal. NPT/Pipe fittings should not be overtightened since doing so might cause the metal surrounding the fitting boss to break. not suitable for the factory Corvette hood; The installer is accountable for doing the installation properly. Your warranty will be nullified by improper installation, which might also lead to engine or vehicle damage or poor performance. Call Approach: 1800351351 Website: https://www.totalperformance.net.au/TCI-TH400-Super-StreetFighter-Transmission-for-Chevrolet-Engines-w/-4-in-Shaft Facebook Page: https://www.facebook.com/totalperformanceTFC Branch Address: Melbourne at 1/10 BRAND DRIVE, THOMASTOWN, 3074, VIC