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    Ventilation Question

    Hi, I have an 89 Sea Swirl Sierra Classic w/5.8L I currently have a 15x15 prop on it right now which is great for pulling people but when you pull a tight corner it tends to ventilate easily... I would like to drop the pitch a bit and go with a 4 blade.. Would it make any difference or is it...
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    OMC Fwd/Rev Gear Replacment

    I am replacing the lower forward, reverse, clutch dog and pinion gear in the OMC cobra I have. I bought a heavy duty gear set from GLM. I need to properly shim the pinion gear so the gears properly mesh. OMC has a special jig to do this. Does anyone know what the exact distance from the thrust...
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    OMC Cobra Gear and Power Question

    Hi, I have a 18' 89 seaswirl with a 5.8L and a OMC Cobra drive, I stupidly screwed the clutch dog and have to replace the lower gears in it I should have replaced the shift cable when I overhauled the gimbal and u-joints... :( I am going to replace the gears with the heavy duty ones and I would...
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    OMC Cobra Drive

    Does anybody have any idea what kind of HP the cobra leg from 89 will handle. My 351W block is cracked and I am going to build a new engine this winter. I was planning on stroking it slightly and would like to aim for 300hp. I think 300 isn't asking too from the leg but figured I would ask and...
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    Engine Swap, EFI or Not??

    This is my first post here so hello everyone... I recently just bought a 89 SeaSwirl boat with the 351W engine in it, OMC cobra leg. The bellows were shot and had ruined the gimbal, u joints and both oil seals. I have replaced all these parts over the last few days and all looks good now. I...
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