Anyone know the approximate flow bench numbers for a header w/ 1-5/8" runners into a 4" collector? Am thinking around 70 CFM per runner or 280 CFM or more per header w/ a 14 in. of water pressure drop. Does this sound about right? Anyone have a calculation for this? Thank-you.

I have a lot more than 9 posts. When the site came back up, my post count was re-set for some reason.