Air filter diameter
 

Quick question. How do you determine what size air filter to run? I'm looking at either an edelbrock 10" or 14" pro flo

The short answer is at a minimum, a 10" dia. x 3" tall, or 14" dia. x 2" tall (3" would be better).
The long answer...
Square inches of filter needed: C.I. x Max rpm divided by 20839
So, 350 x 6,000/20839 = 100 sq. in.
That's based on the CFM requirement of the engine at 100% volumetric efficiency, which your engine is not. Yours may be closer to .80, giving you 80 sq. in. needed.
Then get the circumference of the filter x the height to figure the total square inches.
14" x 3.1416 = 43.98". x 2" tall = 88 sq. in., or 3" tall = 132 sq. in.
You can do the math for a 10" filter. Be sure to show your work! ;)

Thanks! helped a ton

I don't do math. ;) I usually just buy a 14" by 2"-3" thick. Never had a problem with it being too much filter. Just don't get those huge 6"-8" thick filters that the race cars use.

this should be in the stickies