Designed for high performance 390-406-410-427-428 c.i.d. Ford FE engines. The single-plane design provides race-winning power for many types of competition. Carb flange height is equal to the Ford high-riser manifold #C4AE-9424-G to fit under 427 Cobra hoods. Runners have plenty of material for port matching to low- or medium-riser style heads. Machined rear breather flange is included with unmachined nitrous bosses and front oil fill tube boss. Will not fit 427 high-riser and tunnel-port heads. Match with our FE heads. Carburetor Recommendations: Use any size or type carburetor class allows. Installation Notes: Recommended intake gasket: Fel-Pro #1247. Manifold height: A-6.49", B-6.49" . Note: Performer Series & Thunder Series AVS carbs will work with Ford automatic overdrive trans (AOD) when used with Lokar bracket SRK-4000. For more info call (865) 966-2269 or go to www.lokar.com.