Description

The Offenhauser 5692 Buick 401-425 Nailhead High Rise Dual Quad Intake. Works with AFB carbs ONLY. NO HOLLEYS whatsoever. Not even sideways.

The 5191 Low Profile version of this manifold is approx 1/2″ lower than this manifold. Both the 5692 & 5191 are taller than a stock manifold.
5692 Will not fit under the hood of any 1959-’66 Buick. You MUST use the 5191 Low-Profile manifold for proper hood clearance.

Offenhauser 360 Degree Dual-Quad High-Rise Intake Manifolds

Offenhauser 360° Equo-Flow Manifolds are engineered to overcome the problem of starved cylinders by providing the flow characteristics necessary for maximum horsepower output. 360° Equo- Flow design means that every cylinder receives the same amount of fuel/ air mixture.

Looking back, over fifteen years ago Offenhauser broke away from the old 180° design and introduced a 360° design manifold which other manifold manufacturers are now following.

You get full benefit of improved fuel passages on every single engine stroke, there is no downtime with a 360° – your engine operates at full capacity at all times. So-called 180° manifolds operate on a parttime basis due to the fact that one side of the manifold is “down” while fuel is delivered to the other side of the engine.

Exclusive plenum chamber design of Offenhauser 360° Equa-Flow Manifold wipes out flat spots in all RPM ranges. Gives you smooth … unrestricted flow of fuel … continuously. Each cylinder receives equal fuel flow without interruption or oscillation. You get vibration-free smoothness and power rammed distribution through balanced efficiency. Hands you more power off the line . .. a fantastic top end improvement. Dyno, StreetStrip Proven. Test results show a 20 H.P. increase at 6500 RPM over competitive manifold.