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    4.3l v6 won't go past 2500 rpms

    Hello. Brand new 4.3 v6 long block in my 1990 reniell 18.5 open bow boat Runs fine. Out of the water. When in water only getting to about 2500 rpms at 25 mph. Does not miss. Or fall on its face stays running fine just won't go past 2500 rpm. Set timing to 8°. Total of 28° back fires once in a...
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