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  1. 9

    gear ratios

    What is a common gear ratio for a 19ft deep v with a 260hp 350? I have an 86 Cobra with high altitude gears, 1.49:1 I think. What would be the effect of running that low of a ratio compared to a higher one? Can the ratio be easily changed? Or should I just bite the bullet and get the SEI...
  2. 9

    Am I plowing?

    Does this look like the bow is plowing? I am at WOT at this point and it just seems like the boat should be going a bit faster. I'm not sure of the weight, it is a pretty heavy boat though. I have a brand new 5.7 with an OMC Cobra I am only getting 4400 rpm @ 35 mph with a 17 pitch prop. I added...
  3. 9

    GM Performance 350

    Got my GM Performance 350 crate engine dropped in on Saturday and took it out on Sunday to break it in. It ran great no problems at all. Just need to do some jetting on my Edelbrock carb and she should be good to go. I was replacing a 305 in an 86 Mach1 with an OMC cobra outdrive.
  4. 9

    4.3 to 5.0

    What all would be required to go from a 4.3 to a 5.0 of the same year. I have a buddy that has a tired 4.3 and I have a good 5.0 that I am upgrading to a 5.7 this weekend so he would be getting a complete long block.
  5. 9

    Exhaust manifolds

    Just wondering if anybody has replaced their old end riser exhaust manifolds with center rise on a 5.0 or 5.7? If so what all was involved? I am replacing my engine and see a lot more options for center rise manifolds vs end rise.
  6. 9

    5.0 to 5.7 engine swap

    I am about to replace my tired 86 5.0 with an 87 - 96 5.7 long block. Is there anything that should be aware of before making the swap? The new engine is coming with all the tins already so it should just be a matter of swapping the intake, exhaust, and flywheel. I was also considering...
  7. 9

    Fly wheels

    Is there a reason why I would not want to use a much lighter automotive flywheel on a boat? I am doing an engine swap going from a 5.0 to a 5.7 and was wondering that question. I know one of the reasons marine applications use a heavier flywheel is to prevent over revving if the prop comes out...
  8. 9

    5.0L Carb Issues

    First I just wanted to say hi to everybody here I haven't posted before but I have gotten some good info. I have an 18' 86 Mach 1 5.0L 305 OMC Cobra Here is my problem. I was having 3 main issues with my original Q-Jet carb. First one was it had the old stove pipe choke that bolted to the...
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