...#3 - 7 blade 19”, 2.25” pitch, numbers are 914692L75 and 3991431
#4 - 6 blade 18”, 2.5” pitch, steel center with aluminum fins.
I shift at 6k when racing. Currently running 2 10” electric fans and they aren’t always adequate when the temps climb above 80*.
Which fan would you choose and why?