What do you guys have for prop shaft height ? wondering about boat lengths compare to shaft height

2-6 inches below the bottom on most single engine boats. It depends on if its a stepped hull, how much hp and how big of boat.

A 29 non step with 500hp is going need to be a lot deeper than a 29 stepped hull with 800hp.

Deeper gives more leverage to carry the bow and reduce the wetted surface. Stepped hulls don't need to carry the bow as much.

29' Scarab, twin 383,s 400hp/425tq ,,,, less than 5' of boat in water at WOT

she ought to run good with that power? what is you r reason for asking? are you considering 2 inch shorties?

Run's 73mph with a 25p mirage ,,,, reason is I'm thinking tremendous drag,,,, I'm 7 1/4' below hull ,,, I am thinking shorties,,,,,, THOUGHT's ,,,,,

is that 2-6 inches below hull where drives are, or below lowest point at keel? edit; ok, that is single engine spec. well, question still valid for his twin engine scarab. 7-1/4 inches sounds a little deep to me.

the black hawk drives on p29 were shorter drives than a bravo 3 and that boat ran great speeds with minmal power i would recommned shorties

No extension box correct?

i would try the shorties first and see what you get. if you don't like the results or want more then go with an extension boxes i put 3 up imco boxes on my panther and had to change the engrine mount location, so unless you have to pull an engine i would wait on them.
i would be very interested to see how yours runs with shorties. i set my panther up to be 1 1/4 below the bottom with shorties and 3 1/4 with standard length with the 3 up boxes

correction, runs 73mph with 23mirage plus,, run 25 on long poker runs for better cruise, measurment is inline with drives ,, i am wanting to buy shorties, prefer case only ,, would like -3, thinking i can always add ,, ,,,, also has anyone with twins run props inward ? thoughts ?