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  1. Lou C

    3.0 LX cooling system

    And be careful when removing bolts in aluminum housings like an outdrive. Take your time & don’t rush and if the Merc manual says to put Perfect Seal on the threads then do so because it prevents corrosion & seizing of bolts. I use OMC gasket sealer and it works great to prevent seizing.
  2. Lou C

    5.7 Venturi Cluster

    If it’s a 2bbl Mercarb I think that it’s a modified Rochester 2BBL carb. You might ask this question on Cliffs High Performance Quadrajets forum someone may know.
  3. Lou C

    SeaRay 19 BowRider - Which Propeller To Use

    the original gear ratio with the V6 would have been about 1.60:1, so what you have is probably from a 4 cyl application. That will limit top speed but the acceleration on plane should be quite fast. The standard prop with the V6 Cobra was 14.5x19 or 15x17 depending on the size and weight of the...
  4. Lou C

    Water on top of pistons and rockers

    Sometimes it seems as if you don't have water in the oil in the pan because it doesn't get into the dipstick tube until it gets really bad. What's happening is that there really is water in the oil and when it gets to the top of the engine, since the oil up there is cooler than in the pan and...
  5. Lou C

    350/5.7 Exhaust valve seal leak + low compression

    here's what the intake port looks like on an older raw water cooled engine. who knows how close to rust thru they were.....
  6. Lou C

    Intermediate bearing?

    sorry duplicate post!
  7. Lou C

    Intermediate bearing?

    Yep an 05 is the SX series with a conventional gimble bearing like an OMC Cobra some parts are actually the same. You probably have water in the bellows so check the u joints and input shaft seal (rust on shaft can cause seal to fail oil leaks). This is why I/O owners should pull the drive once...
  8. Lou C

    350/5.7 Exhaust valve seal leak + low compression

    I did the same thing on my engine when it was about 29 years old used 15+ years in salt water. Due to an overheat both heads were cracked in the valve seat area in the center cyls on the V6 head. The machine shop I took them to felt the cooling passages were getting too eroded for them to seal...
  9. Lou C

    350/5.7 Exhaust valve seal leak + low compression

    Find one that caters to American muscle cars.
  10. Lou C

    Looking for bare engine block with pistons

    Sorry just saw it!
  11. Lou C

    Looking for bare engine block with pistons

    Wow that looks great! I never learned how to do upholstery, only went as far as replacing the backing wood panels. Soon it will be like new.
  12. Lou C

    Water on top of pistons and rockers

    3-1/2" to 4" I.D. External Flapper - Hardin Marine (hardin-marine.com) something like this, if its the right size, you have to measure the opening in the gimble housing. I know the Y pipe is 3.5" at least it is on mine.
  13. Lou C

    1997 5.7 Gi fuel system

    I took a look at the diagrams, it appears for that year range the engines still could come with a mechanical fuel pump, I'd check yours to see if there is a block off plate that can be removed, (it depends on what engine block was used when they replaced the original) if so I'd use the...
  14. Lou C

    Water on top of pistons and rockers

    You’re welcome! Hopefully that solves it. On my boat I have the OMC 4.3 V6 which originally had the one piece batwing manifolds. In the 15 years I ran it with them I never once had a hydrolock from water coming up the exhaust. The only time I had water in a cyl was due to a blown head gasket. I...
  15. Lou C

    1997 5.7 Gi fuel system

    Also, when using the carb instead of EFI I would have gotten rid of the fuel reservoir there is no need for it on a carbed engine and gotten a Carter low pressure fuel pump and make sure it is wired correctly so that you have power to the pump during cranking from the terminal on the starter...
  16. Lou C

    Water on top of pistons and rockers

    It’s what I said earlier. I’d pull the drive then get a snap ring pliers. Remove the snap ring that holds the aft end of the exhaust bellows in the pivot housing then take off the clamp on the front end of the bellows on the gimble housing. Then pull out the exhaust bellows. Now install an...
  17. Lou C

    Water on top of pistons and rockers

    Ok judging by your pic you’re not sitting low in the stern, mine sits lower, the waterline on mind is right at the top of the part of the transom mount that moves side to side. As in right under the trim piece that says OMC on it. You seem to be an inch or so higher. I measured my static water...
  18. Lou C

    Water on top of pistons and rockers

    If it were my boat I'd look into removing the exhaust bellows, and adding a flapper valve over the gimble bearing exhaust opening.
  19. Lou C

    Water on top of pistons and rockers

    Wow that is really odd. Never saw that before. Every OMC parts catalog I have ever seen, has had them. Either they replaced the Y pipe with a Volvo one due to corrosion, or there was a slip up on the OMC production line and they were left off a number of units. Even to the end of OMC Cobra...
  20. Lou C

    Water on top of pistons and rockers

    nope that's for a Volvo Penta AQ set up. You need the OMC ones, the parts are still available so order up the flappers, pins and grommets.
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