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  1. Lou C

    Carb issues

    hard to say really there can be multiple causes for backfires/misfires. Compression test, will find sticky valves other causes: fouled spark plugs plug wires with too much resistance corroded contacts inside distributor cap, cracked cap or rotor carb issues. It's all auto shop 101. BTW the...
  2. Lou C

    4.3MPI surges badly above 2600 rpm

    Sure is. Why I like the simple mechanical pump pre Vortec engines. At most $100 and a half hr of work to install.
  3. Lou C

    Carb issues

    Could be sticking intake valves, it happens and the cause could have been the water intrusion
  4. Lou C

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

    I agree I might want to replace those elbows to be on the safe side and that also gives you the opportunity to upgrade to taller ones. Even if you need to do minor fiberglass work to achieve that goal it’s worth it. Keep the mind that water in cyls and hydrolock will destroy and engine sooner...
  5. Lou C

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

    If you can post up a pic of the boat in the water specifically the transom so we can see how high up the water is against the transom mount assembly. Here’s mine...the Cobra transom mount & the Volvo SX mount are nearly the same. The cat is fake and keeps birds from using it as a toilet lol!
  6. Lou C

    Omc 4.3? What did i buy?

    eBay, I found a couple of good pre Vortec ones there and the Vortec ones are probably easier to find
  7. Lou C

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

    There would be rust stains in the bottom of the exhaust gas passage of the exhaust manifold. Inside the exhaust gas passage there should just be dark grey/blackish deposits, no rust. The other questions are difficult to answer.
  8. Lou C

    First time pulling a riser with questions about condition w pics

    for the flame arrestor I'd use carb cleaner and dry with compressed air. plugs, it depends on if it's a pre vortec or vortec engine. Does the intake manifold have 8 (Vortec) or 12 bolts (pre Vortec) holding it down?
  9. Lou C

    First time pulling a riser with questions about condition w pics

    Might be as simple as a clogged dirty flame arrestor & spark plugs that need to be replaced. See how the exhaust ports on the pic of my engine are a lighter grey?
  10. Lou C

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

    Aftermarket. Like what you see on inboard boats with thru the transom exhaust. The OMC/VP exhaust bellows is retained with a clamp on the gimble housing end and a snap ring in the pivot housing end. So to remove it you have to pull the drive get a snap ring pliers and remove that end, then tilt...
  11. Lou C

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

    I looked up your engine in the V/P parts diagram on this site and it did not come with flappers. I’d consider removing the exhaust bellows and installing an exhaust flapper on the gimble housing where the exhaust bellows would normally attach. I’d start with that and if it solves the problem...
  12. 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?
  13. 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...
  14. 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...
  15. 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...
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. Lou C

    Water on top of pistons and rockers

    That sounds good! Keep us updated....
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