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  1. Lou C

    First time pulling a riser with questions about condition w pics

    I’m not really seeing a problem there except the engine may be running a bit rich or maybe burning a bit of oil. Looks like you caught it before any damage was done. Aren’t you glad you checked?
  2. Lou C

    Hydrolock, swim platform, riser height and static water line question

    If your boat is a 99 then it may not have flappers, I think V/P discontinued them around that time. V/P also had trouble with their manifold to elbow gaskets and they had been revised a few times. Have you seen any rust stains at the joint between the manifold & elbow? If so then the gaskets...
  3. Lou C

    460 King Cobra oil pump

    Also if you can find it, Lucas Marine oil is a lot higher in Zinc than any of the other widely available marine oils. Might want to see if you can find it. With the roller cams on the newer GM based engines its not needed but with a flat tappet I'd probably use that...
  4. Lou C

    First time pulling a riser with questions about condition w pics

    Whichever ones you buy take a look at the mating surfaces before installing. Some of the imported manifolds and elbows are not machined accurately enough to make a water proof seal. I used a straight edge and feeler gauges to check mine. Look at the Volvo Penta specs I posted in this thread. I...
  5. Lou C

    Winterizing 350 mag?

    Remember to totally drain the bottom end of the big hose that connects the thermostat housing and the front circulation pump should be disconnected in addition to the drain plugs being removed; unless Merc changed the design. There is no need to suck AF up the drive you can simply: Reconnect the...
  6. Lou C

    Omc 4.3? What did i buy?

    When GM converted these to roller cams the block was changed they added 2 threaded bosses to retain the sheet metal guide that retains the lifters in the correct position. But of course millions of small block Chevys did just fine on their flat tapper cams. Just use an oil higher in zinc that...
  7. Lou C

    First time pulling a riser with questions about condition w pics

    Yep we couldn't see that in the original pix due to shadows but for sure they were leaking and for sure replace the whole works. Your engine will appreciate it! This job if let go, will result in at least having to do a valve job in a season or 2. Rusty valve stems, rusty valve seats, low...
  8. Lou C

    Carb issues

    You may have sticking floats or a blown power valve, there are like a gazillion vids on how to rebuild Holley carbs out there, it's basically a 3 piece unit with the center throttle body, and the 2 float bowls some have a metering block on the front bowl only (4160 style) and a metering plate on...
  9. Lou C

    Water on top of pistons and rockers

    That sounds good! Keep us updated....
  10. Lou C

    First time pulling a riser with questions about condition w pics

    When you blow those pix up you see a lot of pitting, on the sealing surfaces. Remember that sealing surface is what keeps water out of the cyls. Usually you can't see the pitting until you get all the gasket material off and take a good close look. These surfaces should look like smooth shiny...
  11. Lou C

    First time pulling a riser with questions about condition w pics

    You can use OMC gasket sealer or Permatex Aviation when you put those back in, just to make it easier to remove them when you do replace the manifolds eventually. Those elbows that the hoses connect to, save em because VP probably charges $15 each for them! They are actually OMC spec parts. The...
  12. Lou C

    Omc 4.3? What did i buy?

    Even with the flat tappet pre-vortec block, you could probably add the vortec heads and a 4bbl vortec intake and perk it up a bit (20-25 hp). I actually prefer the older pre-vortecs with the roller cam for the simple reasons that they have an adjustable valve train, they can use a simple and...
  13. Lou C

    First time pulling a riser with questions about condition w pics

    What I said, don’t like that crack in the outlet of the elbow that suggests significant rust. See how they can look good on the outside but problems are lurking within...
  14. Lou C

    First time pulling a riser with questions about condition w pics

    What I do is prop it up level, pour it in via the feed hose till it reaches nearly the top of the manifold and watch the level, see if it drops & watch the exhaust ports.
  15. Lou C

    First time pulling a riser with questions about condition w pics

    Not really as long as the sealing surfaces clean up well. I might check for leaks by filling with acetone (careful flammable), acetone will find leaks that water won’t. Here in the salt pond it’s fairly common that people will put new elbows on the old manifolds and then change both during the...
  16. Lou C

    First time pulling a riser with questions about condition w pics

    Hello ok I don’t like that crack on the outlet of the elbow. I’d at least replace the elbows since they usually rot out faster. I’d think about getting the sealing surfaces of the manifolds re surfaced at a machine shop if they look good otherwise.
  17. Lou C

    350 Mag MPI Horizon died at sea, cannot find the problem.

    yep we all love electronic injection in our modern cars that run the same day after day, we never had that with carbs back in the '70s due to poor implementation of emissions regs. However when you grow up with Quadrajets, Holleys and Carters (now Edelbrock) it gets in your blood and you always...
  18. Lou C

    350 Mag MPI Horizon died at sea, cannot find the problem.

    We get similar weather to what you have in Scotland but a periods of colder weather, combined with frequent dampness and hotter in the summer. So plenty of opportunity for condensation which is what causes corrosion. All distributors should have vents, there will be a screen in a marine unit...
  19. Lou C

    Omc 4.3? What did i buy?

    (5) complete history of the 4.3 liter with casting numbers | Boating Forum - iboats Boating Forums take a looky here....
  20. Lou C

    Omc 4.3? What did i buy?

    Ah I don’t recall you saying you originally had a 96. Well it can be made to work depending on what accessory pulley set up the 96 has. You need to find out is your 96 a Vortec? Count the bolts holding down the intake manifold if it’s 8 bolts it’s a Vortec if 12 it’s a pre Vortec. The Vortec...
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