No, runner taper, not curve. That means the cross sectional area of the runner decreases as it gets closer to the intake port 9Think funnel, only not so radical). I think the optimum taper is somewhere around 7 degrees. When you use a tapered runner, the shrinking size of the runner speeds up the intake charge, increasing port velocity, which will promote more efficient cylinder filling.
Go read some books on intake design..it will be worth it.
Marty
Go read some books on intake design..it will be worth it.
Marty
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