I think this site went down while I was posting.

This setting is critical. I don't bend anything until I'm absolutely positive that I am doing the test correctly.

Here is an old posting that I found but I would follow Carbking's advice.

https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=76806

Last edited by buoymaker; 06/09/2021 2:51 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."