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#1
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350mag v20
im mid swap on my I/O 1991 v20
taking a dead 4.3l out and swapping in a 350mag mpi motor (300hp) with a matching bravo 1 leg im wondering what kind of top speed ill get and what pitch prop would be appropriate? Im going to add trim tabs too, any other thoughts? 
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#2
11-25-2014, 06:54 AM
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sounds like a good swap, I'd suggest starting with a 23P Mirage, that should put you in the low 60's. That engine is rated to turn 4800-5000, you may need to step back to a 21P depending on how its loaded. Trim tabs are a must
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#3
11-25-2014, 10:15 AM
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That engine is sensitive to propping, just a bit to much pitch and it will bog down. Put one in the SEARAY I did years back, and it was a DOG, only topped out at 4200 RPM's and about 30 MPH. Had the prop repitched from a 17 to a 16 and it jumped up to 4800 RPM's, and topped out at almost 40MPH. It should move right along in the water though.
__________________
2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD  AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664 
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#4
11-25-2014, 01:31 PM
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GarageNC has one with a similar powerplant that is peppy so I've heard..
It should go fast enough, I will guess mid-50's. Welcome aboard BTW.. 
__________________
 1996 -19' NV Flats 115 Mercury 4-stroke 1983 -20' Wellcraft Center Console 250 XS
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#5
11-25-2014, 03:01 PM
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Thanks for the welcoming replies
Been a long time lurker didn't realize that was my first post! I've been looking at Bennett hydraulic tabs ( I was told they are one of the best) Any idea on what size? I'll have to get some Picts ups Can't seem to do it on my phone
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