Which Carb Gives a Balance of Power & MPG?
Me too. The Offy intake I spoke of wasn't even in the comparison. It wouldda wiped um out. The Offenhauser 360 manifold is NOT comparable to the Performer. Even Edelbrock's own description is "A stock replacement intake". The 360 is nowhere near a stock manifold. Just so we all know which manifold I'm talking about, since i have both the Performer 383 and the Offenhauser 360, here they are side by side.
First off, here is the manifold in question.
Here is a Performer 383 and the 360 side by side.
Here is a closeup of the Performer's plenum.
Just like a stock intake, it is a dual plane design which promotes stock like engine responses and is good to around 5000-5500 RPM.
A closeup of the Offenhauser's plenum.
Notice how deep it is in comparison. The plenum extends almost the ENTIRE width of the intake. It is huge. The intake port dividers only run into the intake a few inches and then it's just an open plenum. It's a well known fact these sumbitches will pull past 7500 RPM while retaining excellent bottom end power and torque. The Performer ain't doin all that.
Again, the side by side shot. It's apparent how much taller the carb pad is. This just adds even more to the plenum volume.
From the top, the difference becomes very apparent.
The 360 is obviously a single plane intake manifold. We all know single planes make more ultimate TQ and HP up top, but the 360 is a different style of single plane. It is able to retain the bottom end TQ and HP and still pull great on top too. I wasn't trying to "push" the intake. If somebody wants this Perfoprmer 383, I'll push that all day long. Yall ain't gettin the Offenhauser.
Oh, and lastly, the Offenhauser has enough meat already to open up for a spread bore. the reason there is because they also make an idntical manifold for the spread bore. It's the same casting with an opened up carb pad. Although I'm going to run a thermoquad, I have actually decided to break one of cardinal rules and run an adapter plate. That will raise my RPM range a little more.
To expound a little further, here is Summit Racing and Offenhauser's description.
"Offenhauser's 360 Degree Equa-Flow Single Quad High-Rise intake manifolds feature a 360 degree design for full-capacity operation. This combination of unrestricted fuel-air flow and a divided plenum means no flat spots throughout the entire rpm range. What does all this mean? The equal fuel flow to each cylinder increases horsepower and torque, while evening-out individual cylinder temperatures. Power bands start as low as 1,800 rpm with a small carb and climb all the way to 8,800 rpm with a big one."
Me too. The Offy intake I spoke of wasn't even in the comparison. It wouldda wiped um out. The Offenhauser 360 manifold is NOT comparable to the Performer. Even Edelbrock's own description is "A stock replacement intake". The 360 is nowhere near a stock manifold. Just so we all know which manifold I'm talking about, since i have both the Performer 383 and the Offenhauser 360, here they are side by side.
First off, here is the manifold in question.
Here is a Performer 383 and the 360 side by side.
Here is a closeup of the Performer's plenum.
Just like a stock intake, it is a dual plane design which promotes stock like engine responses and is good to around 5000-5500 RPM.
A closeup of the Offenhauser's plenum.
Notice how deep it is in comparison. The plenum extends almost the ENTIRE width of the intake. It is huge. The intake port dividers only run into the intake a few inches and then it's just an open plenum. It's a well known fact these sumbitches will pull past 7500 RPM while retaining excellent bottom end power and torque. The Performer ain't doin all that.
Again, the side by side shot. It's apparent how much taller the carb pad is. This just adds even more to the plenum volume.
From the top, the difference becomes very apparent.
The 360 is obviously a single plane intake manifold. We all know single planes make more ultimate TQ and HP up top, but the 360 is a different style of single plane. It is able to retain the bottom end TQ and HP and still pull great on top too. I wasn't trying to "push" the intake. If somebody wants this Perfoprmer 383, I'll push that all day long. Yall ain't gettin the Offenhauser.
Oh, and lastly, the Offenhauser has enough meat already to open up for a spread bore. the reason there is because they also make an idntical manifold for the spread bore. It's the same casting with an opened up carb pad. Although I'm going to run a thermoquad, I have actually decided to break one of cardinal rules and run an adapter plate. That will raise my RPM range a little more.
To expound a little further, here is Summit Racing and Offenhauser's description.
"Offenhauser's 360 Degree Equa-Flow Single Quad High-Rise intake manifolds feature a 360 degree design for full-capacity operation. This combination of unrestricted fuel-air flow and a divided plenum means no flat spots throughout the entire rpm range. What does all this mean? The equal fuel flow to each cylinder increases horsepower and torque, while evening-out individual cylinder temperatures. Power bands start as low as 1,800 rpm with a small carb and climb all the way to 8,800 rpm with a big one."
