What is the tipical x dimension of a single engine cat. I measured mine and it is 1/2 inch below the lowest point on the outer sponson.
Thanks John

That is not X dimension. That is propshaft depth.

Mine is 3 inches above the lowest point of the sponsons.

Griff i thought the x dimension was the propshaft center.John good question.Been mucking for quite a while with my Daytona 27.Started off 2" shortie,X level with lowest point of sponsons.103mph,bit over half throttle,34 Bravo 1 on the limiter at 5800.Went 1 1/2 spacer.Could'nt get it to 5200 same prop.Now have 1/2 spacer,not tested yet but i think it will be the go.With the 1 1/2 spacer tried Maximus's and Bravo's,lot's of pitches but the setup never felt as good as with no spacer.Can't run the Maximus without a 1/2" spacer.Hope this helps.
Marty tell me more about the single engine 30 footer.

X dim is actually the crankshaft centerline. Propshaft depth is what really matters anyway and it can be changed with spacers and shorty drives.

I meant the prop depth sorry guys

I think it is also important to know what lower and prop you are going to run. I also think they are assuming you are talking about an outdrive vs outboard.

xr sportmaster drive bravo 1 prop thinking of tring a hydramotive cleaver

Wouldn't try the Hydromotive.Won't work with high X single engine cat.Need Bravo,Maximus or the Bravo style Hydromotive.

John,Post a picture.