The Edelbrock Performer Intake Manifold has a patented runner tuning and a 180 degree firing order. This combination boosts torque over a wide RPM range, from idle to 5, 500 RPM. These manifolds also deliver improved throttle response over stock intakes and are available in both EGR and non-EGR (Exhaust Gas Recirculation) styles. Fel-pro perm torque and blue intake gaskets are not used in this manifold because of their very hard, non-pliable construction. They do not compress well when used with an aluminum intake manifold. The factory composition-type embossed gasket also works satisfactorily. The manifold bolts need to be torqued down to 25 ft/pounds in most cases. When using a 12-bolt manifold on 16-bolt heads, a 16-bolt intake gasket is used to ensure proper sealing around the water ports on the heads. This manifold has no provision for oil fill tube, OEM choke operation and uses both electric and manual choke.