Can anybody tell me there experiences with adding drive spacers?? What was your cause and effects of the drive spacers?? Thanks

Had high propslip and very little bow lift reaction with trim. Added another inch of spacer and it helped quite a bit.
Picked up 3-4 mph at cruise speed and 1-2 mph top end. Carried the bow better and did not run as flat/wet.
Propslip went down about 5%

I moved the prop shaft up 1/2 inch by taking by replacing a 2 inch spacer with a 1.5 inch spacer. The prop slip (w/ 2 inch spacer) was in the single digits at WOT and engine rpms were below peak power. The result (w/ 1.5 inch spacer) was more slip, rpms and speed.

My x on boat from what I can measure was two inches higher I can get on plane but no mid speed or top end slip rate was 38% ouch way to high found some two inch spacers will try this weekend let you know results. On a side note the boat used to have big power in it at one time now since I purchased came with 500 efi I would only assume that was the reason for high x on boat would have perfered if they just bought shorties left x alone but is what it is