Originally Posted By: efi-diy
The magic to make it happen is the 4200 head... 340CFM intake @ 28" water

240/250 CFM (depends on which head was flowed and the work done)@28" water



Is the is that 340cfm intake and 240/250cfm exhaust? What lift is that flow happening at?

I'm not arguing with you by asking this. I'm just curious.