Not Ranked
Alot of the people that are running single 4bbl carbs are using the K&N E-3505 oval air filter. The filter height is only 2" and the filter flows around 390 cfm. There is a 4" version that will flow around 775 cfm, however it is too tall for most Big Block Cobra's. I was able to have some custom 3" K&N filters made that will flow around 600 cfm. I run the 3" filter unless I think the other car/bike is really fast, then I will take my chance with no filter at all.
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