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    Cracked Exhaust Manifold-1991 OMC Cobra-4.3L

    I have cracks along the lower part of the outer exhaust manifolds from last owner's neglect to winterize. Can those be tig welded? What are the chances of an internal leak also?
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    Overheating/Water flow problem - Help

    I have a 1991 OMC Cobra with a 4.3L in a SunBird Corsair 198 that's been quite the project. After rebuilding the engine and re-installing, it doesn't seem to be pumping water running off the muffs in the driveway. Barely any water, mostly steam comes out of the exaust bellows or prop. This is at...
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    91 Cobra Lower Unit ?

    I have a 91 Cobra that has a water/air leak in the lower unit. Do I have to pull the upper unit before I can drop the lower unit? Thanks!
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    Thanks Bond-o and jtmartin!!

    I got the 180* issue fixed with the timing, and the motor purrs like a kitten, at least until it starts getting hot. (in the driveway, with a muff) I checked around the outdrive pump and it felt hot, so I took it apart and saw no water entering the pump when the hose was on full, unless I...
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    Engine rebuilt - won't start

    I bought a 91 Sunbird with a blown 4.3L OMC Cobra. I pulled the engine,replaced the block, crank and cam with a 95 version from an S-10. I had the machining and assembly done by a pro engine builder who knew marine engines. Everything is back together with an electric fuel pump added to feed the...
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    Mechanical to Electric Fuel Conversion Diagrams

    I have a 91 OMC with a 4.3L - carb. engine that just got rebuilt using a 95 block, which has no mount for a mechanical fuel pump. I ordered an electric fuel pump designed for carb marine use. I need to know how to adapt the electrical wiring to the new pump. Anyone have any diagrams? Also, is...
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    New Engine Alignment Problems

    I have replaced the 1991 4.3L in my OMC sterndive. The replacement block came out of a 1995 S-10 truck. All other parts came off of the original marine engine. I of course, had to add an electric fuel pump for the carb, but other than that, everything is stock. I am having a pretty serious...
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