90 mph small block I/O boat on ebay ? Naaaaaa

[roadkill636]

Ya all think this boat can get up to 90 with a 350 and this outdrive?

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F273104159124

[freeebird]

The Blackhawk is a surface drive pushing a light, air entrapment aluminum hull, but a 350MPI? That's pretty ambitious unless that is one badass small block. Sounds stock in the description, so I'd say no.

[wogi]

90mph Is possible, on the trailer pulled buy a Z vette down hill with a good tail wind

[91eagle]

I don't have much experience with I/o....... that hull looks pretty cool but cool don't get 90 mph lol...I don't think stock small block turns the kind of RPMs that the outboard guys do... it has to be a pretty good pitch on that prop..... I like to know what the numbers was on the prop..... just a guess I'd say that boat does 70 mph or so

[marks86]

Remember the 21 eliminator with a stock 502mpi with a Blackhawk ran 90mph from the factory.

[flabum1017]

I don't have much experience with I/o....... that hull looks pretty cool but cool don't get 90 mph lol...I don't think stock small block turns the kind of RPMs that the outboard guys do... it has to be a pretty good pitch on that prop..... I like to know what the numbers was on the prop..... just a guess I'd say that boat does 70 mph or so
The 350 MPI Mag turns 5200.... prob has 1.5:1 gear looks about 26" or so pitch, 10% slip (being generous) =77MPH........ he would need to be able to turn a 30+ pitch wheel to get 90

[marks86]

lets give this the benefit of the doubt, I think they made blackhawks with 1.36 and I think they only made 27 29 30 pitch props something like that.

[wogi]

I don't know but have heard it said that the Blackhawk drive has a lot of slip

[flabum1017]

depends on the setup, but duoprops have very little slip

[flabum1017]

lets give this the benefit of the doubt, I think they made blackhawks with 1.36 and I think they only made 27 29 30 pitch props something like that.


There were different ratio's ..... I know the small blocks used either the 1.36 or 1.5, I remember there was a 1.65 too, but that would only be a big block ratio

[nova26]

Scarab P-29 has SBs with BHs 165gears and 31p props