Offenhauser 5165 Oldsmobile F85 & Buick Special Single Quad Intake Manifold


Oldsmobile F85 & Buick Special thru 1963 (with heat) 215 C.I. Alum. V-8 Carburetion: 465 CFM for street

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Offenhauser 360 Degree Single Quad 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 the 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.

Offenhauser 360 degree Equa-Flow single-quad low-rise intake manifolds. Their single plane, 360-degree design, with its special split plenum and carefully shaped runners, supplies a dense fuel-air mix to all cylinders all the time. This wipes out flat spots and significantly boosts overall output.


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