I'm no expert here but there was a previous discussion and it may be of some value.
https://www.stovebolt.com/ubbthread...56665/re-3600-rear-axle.html#Post1456665

Last edited by buoymaker; 10/06/2022 8:09 PM.

"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."