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  1. nola mike

    Is this the aluminum head 470.

    Meh, don't listen to the haters. If the donor is in good shape I'd go with that. Yes, the 4.3 is a better engine probably. But the 3.7 is pretty damn good overall. The quirks are less important in a 30 year old engine. That donor already has the alternator. Can't tell the hx size; an 89 should...
  2. nola mike

    1989 180/3.7LX 4 bbrl Mercruiser Alpha One drive Questions

    Guess I'm not clear what we're talking about. The driveshaft to the gear housing isn't hollow. The lubrication for the lower/gear housing is supplied by the passage between the 2 halves of the outdrive.
  3. nola mike

    Is this the aluminum head 470.

    Are you swapping in a new engine or getting a new boat?
  4. nola mike

    1989 180/3.7LX 4 bbrl Mercruiser Alpha One drive Questions

    No, this actually isn't correct. Both seals have the spring side up. (Yes, I realize that that isn't how you'd think it should be) Also, drive shaft definitely isn't hollow Also also, a bad lower seal will still pressure test ok. You'll need to replace the upper as well.
  5. nola mike

    Running lean after engine swap

    No, I think I'm fine throughout most of the range at this point, maybe even a touch rich. I had a revelation while sleeping last night. After getting the new tach readings it seems like my readings are off by the perfect amount if I'm set for a v8. 2500=3200, 3500=4500. I triple checked it...
  6. nola mike

    1989 180/3.7LX 4 bbrl Mercruiser Alpha One drive Questions

    There are two seals in that cavity. The upper seal is primarily responsible for keeping the oil in the housing. The lower seal is to keep water out of the normally dry cavity there. If that lower seal is shot, there's a good chance that your drive shaft is pitted and needs repair. The lower seal...
  7. nola mike

    Running lean after engine swap

    Heh, hard when you're the only one on board. But yes, worth checking. 23p, quicksilver al. I'll have to check when it's idling ok to see what's going on. I may be on the wrong track, but i can't figure what else would cause this particular idle issue. It also doesn't seem to clear when I rev...
  8. nola mike

    Running lean after engine swap

    That's not my understanding of how the system works. You want to be running in cruise mode unless under moderate part acceleration, when vacuum drops and you get into the power section of the rods. The spring strength (which is in inhg, realized I've been saying mm) determines at what vacuum you...
  9. nola mike

    Another winterize question

    The internals that are already bathed in antifreeze?
  10. nola mike

    Another winterize question

    Seems like a huge waste to do anything on a full system. What are you protecting? Risers? Hx? Even a ½ system I really doubt you'll be extending manifold life significantly with a/f vs. just a fresh water flush.
  11. nola mike

    Another winterize question

    Wow, @tpenfield , those are awesome diagrams. I daresay they're sticky worthy, @GA_Boater
  12. nola mike

    Running lean after engine swap

    I'm running the stock 5 mmhg spring. So it's not getting rich until nearly WOT. Haven't checked the advance. I'm running the exact same prop and drive that I had on my 3.7. With better compression and 50 more hp, I should be doing better. Trim is the same, though it doesn't feel like I'm able...
  13. nola mike

    Ford to Chevy Shiftplate Relocation

    Guessing it's glass over a plywood box.
  14. nola mike

    4.3L intake manifold drain?

    I've seen discussion about an intake manifold drain that needs to be pulled to winterize the 4.3L vortec. I don't see a super obvious drain plug on mine, and can't find anything in the manual about it. Could someone point me in the right direction? Pic is of my intake manifold, the only thing...
  15. nola mike

    Drive removed for the 1st time, gimbal aligment inspection

    Looked like you had a much harder time on video #2 than 3? Try using a lot less grease on the tool. A very thin layer is enough.
  16. nola mike

    Running lean after engine swap

    @Rick Stephens Worrying less now, working on tuning. Might have imagined it anyways. Those plug pulls were actually from last time out, which was a similar run with flooding at the end. I'm still a step lean on the secondaries from stock. I could also try some stiffer springs, which would get...
  17. nola mike

    Running lean after engine swap

    Ok, another update. Got my cheap digital tach working, and came up with these numbers: 3200 rpm / 32 mph / 11 mmhg 3500 rpm / 36 mph / 7 mmhg 4k /42 mph / 5-6 mmhg Wot 4500 rpm / 4-5 mmhg I thought I heard it ping a couple of times at wot. I'm going to fatten up the secondary jets and see...
  18. nola mike

    Nola Mike's 3.7/470 --> 4.3L swap thread

    Got my induction cheapo tach to work (I also got a slick bluetooth dvm that can measure hz, so I'm going to see if I can get some reliable readings from that). my boat tach does indeed seem to get worse with increasing rpms. Now speeds are looking just like they were with the old motor, 1...
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