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Originally Posted by bubbagump
A flat ram is an underhood version of a Tunnel Ram. The dream is volumetric efficiency will go over 100 percent with the tuned length runner.
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that's the idea with weber carbs, tuned runner length. But with webers, you'll probably get better/even fuel distribution. Some of these aftermarket cross rams don't get good fuel distribution, and may not make the power you think they should make. On a dyno, you can test each cylinder to see what A:F ratio each cylinder is getting. If they are off, then you can make alterations to the inside of the intake to get even distribution. Alot of work. I've heard that the Edelbrock and M/T FE cross rams are not that great for making power because of this, although they look impressive.