Learned this many years ago with my old 340 car....It used to print time slips, but one day we messed with drop bases and air filters vs. none....

Same conclusion, drop bases work. Adding a filter is a restriction, but the right filter should net nearly zero as compared to wide open we lost 1/10th without the drop base and filter...

I like your test method, numbers don't lie....


'70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown 440 Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk