mark rice

hi i am new to this forum from over the pond ,i have inherited an old 1969 wooden hull racing boat, i have spent years re building it .
it was originally powered by two 427 mercruiser 330 engines coupled to mk3 stern drives ,i have gone to great lengths to re engine this with two yanmar 320hp diesel engine as the cost of gas in the UK is now ridiculous. my only hurdle now is props, these units use a huge 19" diameter propeller , the boat is running 25" pitch at the moment but its just not enough,the yanmars peg themselves on the 4000 rpm governor far to easily.As these are such old drive units finding suitable propellers in the uk is now impossible i am hoping that someone on your side of the pond might be able to point me in the right direction as Ive been told that there are still quiet a lot of the mark 3 units still in use in the states.
And i am hoping someone somewhere will still have some old props lying around.
any feedback would be a great help.
also if anyone is interested i have a pair of 19 1/4 by 21 pitch and also a pair of 23 pitch
which are new.

bowtie

I've been working on Mercruisers since the late 60's and I have never heard of a Mark 3 outdrive. The only Marks I've known were outboards.

compedgemarine

I would assume he has #3 speedmasters, if so I am guessing you have the small shaft drives, there are not many props still around for the small shaft 3's but hopefully someone here may have a line on some.

mark rice

hi you may know these as mercruiser 111 drives some did have speed master under water units but these have not they have the big 1 1/2 23 spline shaft some call them the big boot units because they were so large reg mark

mark rice

hi these are mercruiser 111 drive units first came out about 1969/70 reg mark

airjunky

iTrader: (2)

Might want to think about trying to have the props you have reworked to match the powerband of the diesels..could get you closer while you look . And save fuel .you know im going to ask , what became of the 427's?

JJONES

Mercury Mach 111 14 1/2 x 32 choppers 15 spline R & L
http://www.screamandfly.com/showthre...spline-R-amp-L
FOUND THESE ,NOT MINE,JUST THOUGHT IT MIGHT HELP

mark rice

thanks for your info but dont want choppers just old style ally props or stainless if im lucky they need to be 19 1/4 diamiter by 27 pitch reg mark

mark rice

hi already had the 25 pitch re pitched to 26 but alley props wont go much more they are brittle and crack cant find any stainless ones or a pair of 27 pitch ive still got both 427 that came out was going to rebuild them as they are 4 bolt mains and steel cranks i have already put hypo heads on them reg mark

mark rice

hi you may know these as mercruiser 111 stern drive units im sure you must have come across them if you have worked on mercruiser for as long as you say reg mark