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Verado 350 sci engine height

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Old 10-18-2010, 04:40 PM
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My Boats: Phantom 25 (1985) w/Verado 400R
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Default Verado 350 sci engine height

Hi,

I hope you all are well

We will start rigging my Phantom 25 next week. Almost all parts are now in house, included a very nice Gorilla jackplate. I have read about the issues about blow out and water pressure using the 2nd generation gearcase of 350 sci. Lets hope the new Poseidon is faster. Since I use a 20 inch midsection on a 25 inch transom, its important to get the jackplate mounted correctly. The reason for using a 20 inch midsection is to get the COG as low as possible. 350 sci is a tall engine, although its only 12 cm taller than a Promax 300

I wonder how high the 350 sci propshaft can be run before loosing waterpressure. I need it to be approx. 2-2,5 inches below the bottom to receive the top speed I need. I did have a Promax 300 some years back, and 2 - 2,5 inches below was spot on. I do not want to add a nosecone, as it will slow me down. Estimated speed will be approx. 82-83 mph. The Promax 300 (not X) pulled the boat to 76-77 mph.

The propshaft height will be approx 3,5 inches below at cruise (plus the fact that the water hits the prop higher due to 4 1/4 setback.

Look forward to hearing back from you.

All the best, Toffen

Last edited by Toffen; 01-25-2011 at 03:07 PM.
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Old 01-25-2011, 03:12 PM
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Default Verado 350 sci engine height

Hi,

Any ideas?

Cheeers and thanks! Toffen
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Old 01-25-2011, 07:43 PM
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Send us pictures. We just rigged our new 41 w/ 3 - 300 hp Verados and went all the way up on the bracket.
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