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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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.
  6. 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...
  7. 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.
  8. 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...
  9. 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...
  10. 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....
  11. 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...
  12. Lou C

    Neutra Salt System Solenoid and pully question VP 5.7 Gi-f

    Ok see it now. Yes those tensioners are commonly used I have one on my ‘07 Jeep 5.7 Hemi. My ancient 4.3 still has V belts.
  13. Lou C

    Omc 4.3? What did i buy?

    Ok from the 14088553 the 553 is the actual casting #, that lines up with a 1986-1988 with one piece main seal. The 14094768 head casting number lines up with the same year range The .20 might be the size the cyls were bored during the rebuild. The T#s are probably a GM serial number, the T...
  14. Lou C

    Volvo Penta 5.7Gi Closed Cooling Question

    It’s hard to tell from pix but try tapping them with a small hammer, if it makes a sharp ring then they probably are still solid, if they make a dull thud with flakes falling off they need to be replaced.
  15. Lou C

    5.7 Venturi Cluster

    As I said before, even though its not a Quadrajet, post this up on Cliff's Quadrajet site, someone there may know.
  16. Lou C

    Omc 4.3? What did i buy?

    You have to be more specific, which numbers came from where on the engine. You should be looking at the block casting # right behind cyl #6, and the cyl head casting #s that you can see when you take off the valve covers. The marine Fel/Pro head gaskets are blue.
  17. Lou C

    Neutra Salt System Solenoid and pully question VP 5.7 Gi-f

    Your actual boat is different than the diagram you posted. That diagram had a tensioner, on yours you seem to have 2 idlers. The adjustment is made by moving either the alternator or the P/S pump, whichever it is that has adjustable mounts. Its a good idea at the start of each season to loosen...
  18. Lou C

    New Gimbal bearing won’t take grease

    Try reaching in and turning the bearing while greasing it. I use Lucas marine grease (blue grease) and no problem with greasing it.
  19. Lou C

    Omc 4.3? What did i buy?

    It could be a truck motor or even a Merc 4.3 since theirs were painted black instead of grey. The differences were stainless steel head gaskets and brass freeze plugs. If it’s a year older than your engine that could explain the flat tapper cam. I have a 1988 original OMC 4.3 and it has the...
  20. Lou C

    New Gimbal bearing won’t take grease

    Are you sure this is a greasable gimble bearing? Because the newer ones are often not greasable. Another foolish idea from Merc & Volvo.
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