I have a 27ft Excalibur speedster and i want to invest in a imco short lower unit. My x dimensions right now is 19 and wondering if any one have any suggestions on the either to get the 2" lower or one 1" cause i have a feeling the 2 might be too short.

I would buy -2 if you cant get it to work after a few prop changes buy a 1" spacer. but 19 is pretty high as is. that's 3.5 under the bottom.

Thats why i was saying to get the 1" or the 1 is shorter than the two? Im new to the imco lowers and never owned one before.

What does the boat run like at speed and what prop is on it.

28 pitch bravo one labbed 87 miles

Nice speed no chime walking.
Have you checked the bottom with a straight edge and sharpened up the chimes.
That could give you something.
Maybe look for a 1/2 spacer.
Gopro camera on the transom could be of some help to see what is going on.
What color is the boat. Excalibur speedsters are great boats.

how is an x of 19 equal 3.5 under the bottom??? please school me

It's not, it's 3" iirc bravo is 22" input shaft to prop shaft, x of 19 = propshaft 3" below running surface

I did a few of them. One I set at 19 and one I did 19.5 . I think thats the max you want to go without a box on it.

was that with a trs or with a bravo?