I have SCX 1400 lowers with 1 7/16 shafts. What would it take to run cleavers, if anything (adaptors?)? It appears the #6 prop shafts have less spline length but may be larger diameter (1 7/8" maybe?) I haven't compared in person. Currently running 32p maximus but I think I may have too much wheel there. If i went to a larger diameter prop i could remove the 1/2" spacer from the drives and maybe gain a little cruise speed in the process. Currently cruises around 71-72 @4000 rpm. Just cruising through options.
This is on 38 powerplay with 825efi

Also considering 6 blade herings but cannot find anything to fit 1 7/16 shaft

IMCO makes a 1 7/6" shaft to #6 prop shaft adapter.