Speed Density to MAF

[5liter87]

Just wondering...in the middle of swapping motors, and im looking at which MAF meter i should be upgrading to, not sure wat MM to use. can someone inform me of the basic difference...does it have anything to do with my Throttle Body...ill be using a 75mm BBK. btw, 30lb injectors

 

[Venom351R]

Your Mass Air Meter should always be bigger then the throttle body you are using. What sizes to go with depends on your application. As far as the stock size of the Mass Air Meter I cant remember but aftermarket ranges from 76MM to 97MM and 65MM t0 90MM for the Throttle Body.