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  1. Lou C

    OMC 4.3 V6 dry joint "batwing" conversion exhaust kit

    OK the only manufacturer who lists dimensions is GLM. I know there were quality issues with them in the past but this is just informational, so here's dimensions I got for the Merc Dry Joint V6, and the OMC and Volvo wet joint... The OMC and Volvo are identical...what I get from this is that...
  2. Lou C

    Why do V8 boat engine have so many cooling system parts ? Compared to a basic V 8 car engine ?

    Well there are a few... 1) improvements, Merc came up with the warm manifolds system which reduces condensation in the exhaust system but adds hoses 2) convenience, single point drain adds a lot of extra hoses and fittings, but to me is not an improvement, because they can clog due to rust...
  3. Lou C

    OMC 4.3 V6 dry joint "batwing" conversion exhaust kit

    ok did some more thinking on this, there may be 2 dimensions that are important, the one I just mentioned and also, from the 90* down pipes to where the hose for them ends up on the end of the elbow.... I took a pic of a turn key Volvo engine from Michigan Motorz website to illustrate...
  4. Lou C

    OMC 4.3 V6 dry joint "batwing" conversion exhaust kit

    I think the important thing is actually this: the total height of the manifold/elbow assembly above the level of the mounting bolt holes in the cyl head, because even if the elbow for the dry joint is the same height as the wet joint, if the manifold height is different where it mounts to the...
  5. Lou C

    My block is drained, right?

    I took a screen shot from a VP manual for wintering, all I could find....
  6. Lou C

    My block is drained, right?

    I'll have to look around. It was an OMC TSB IIRC and Volvo also picked it up, they actually used OMC shop manuals during the joint venture era that were a lot better than Volvo manuals lol. I think it may be like this, if the engine isn't level, or not tilted down in the front, it may be...
  7. Lou C

    1989 OMC Cobra exhaust seal

    See if you can work it free IIRC mine is like that too, one side moves easily the other not as much but I’ve never had water come up the exhaust & I’ve owned this boat for 23 years!
  8. Lou C

    OMC 4.3 V6 dry joint "batwing" conversion exhaust kit

    Sure thing I will measure them today. If it works out for you then I’ll do the same thing next time I have to change mine which will be at the end of next season for sure….
  9. Lou C

    Happy Thanksgiving . . .

    When Norman Rockwell burned the Turkey and got helped out by his friend the angler…
  10. Lou C

    Happy Thanksgiving . . .

    Happy Thanksgiving to all!!!
  11. Lou C

    My block is drained, right?

    Not sure what they changed when they went to the Vortec heads and manifolds, but yes this has to be drained and there was actually a TSB put out indicating that. On my old pre-Vortec, the manifold just drains with the cyl heads....if I had to guess, it might be that since they had eliminated the...
  12. Lou C

    Pink Super Tech (Walmart) -50 RV and Marine ok for engine?? I always thought NO...??

    I like the Sierra PG. I think it helped be get this much time from my old salt water used inboard…
  13. Lou C

    Fuel starvation conundrum

    I recall seeing the Project Farm guy and one of the other small engine guys on you tube (Teradactyl with the fake teeth lol) doing that when testing stabilizers. I think it would burn because the engine always started right up like always. Starts, idles, and revs in neutral. But wouldn't plane...
  14. Lou C

    OMC 4.3 V6 dry joint "batwing" conversion exhaust kit

    Here's an old pic when I changed to the last set of Batwings I used, in 6/2011, the ones I took off were on there since 2004, you can see there's no rust in the exhaust ports, the rust on the head is from the gasket holding moisture against it. I guess I got lucky lol. Inboard exhaust to me is...
  15. Lou C

    OMC 4.3 V6 dry joint "batwing" conversion exhaust kit

    Here's a few tips, because the clearances on the starboard side are tight, put a little silicone grease inside the rubber hoses (silicone grease doesn't degrade rubber like regular grease) it will make it easier to get it all lined up right. What I usually do is slide the lower hoses on the Y...
  16. Lou C

    Fuel starvation conundrum

    I actually did the other day when I scoped the manifolds. Boat ran prefect with the outboard tank so I felt it had to be fuel related….
  17. Lou C

    My block is drained, right?

    Agreed, I would do that just to improve the odds so to speak. One nice thing about having the Sierra PG stuff and the refractometer, is I can mix up custom batches of AF for just such a situation that are stronger in AF concentration. My usual mix is 50/50 with water and that gives approx -30*F...
  18. Lou C

    OMC 4.3 V6 dry joint "batwing" conversion exhaust kit

    I used one set of the Batwings from 2004-2011, at that point one of the 4 outlets was clogging with rust so I replaced them and ran the next set to 2016, at that point, I had the leaky head gasket adventure that resulted in a top engine overhaul (cyl heads, etc). At that point there were no more...
  19. Lou C

    OMC 4.3 V6 dry joint "batwing" conversion exhaust kit

    That's exactly what I was thinking of, there's a 7*, 10*(?) and 14*, after thinking the whole thing though I felt it was less trouble to use what I know would work. Also there's the relative heights of the outlet of the elbow, above the mounting points, there is really no way to know if it would...
  20. Lou C

    OMC 4.3 V6 dry joint "batwing" conversion exhaust kit

    I thought of that when I converted mine back in 2017, but I thought there could be slight dimensional differences that might cause leaks. So I went with the Barr OMC/Volvo wet joint with the VP 90* down pipes and rubber hoses. Fit fine no leaks…I think I’d have to be able to borrow a...
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