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  1. IslandExplorer

    Crank driven vs block mounted raw water pump pros/cons

    Hey all, I was looking to start a thread with some ppl chiming in about possible pros and cons of using a crank driven raw water pump vs engine block mounted pump driven by a belt on an old stern drive like my Mercruiser 302 V8. I'm building a whole different cooling system with heat exchanger...
  2. IslandExplorer

    1986 18' Super Sport

    Here ya go. Took a little to find it. Sorry for the cammo green on green background.. 😅 I can measure it if you think it'll help. Those angled outside edges were riveted right through the hull. The bottom flanges were on top of and riveted to the 1/2 plywood deck, the top had matching 1/2" ply...
  3. IslandExplorer

    Bellows adhesive or not?

    If you're worried about it leaking bc of somewhat conpromised surface and don't mind spending a few minutes years from now cleaning off a little sealant- then seal it up good! You'll probably feel better about it later when you're out there. I like the kind that sets vs slippery/greasy type...
  4. IslandExplorer

    1986 18' Super Sport

    I still have the original aluminum bulkhead structure from my Supersport that created the bow rider seating/platform. Guess I just couldn't let that fine looking structural piece go.. 😅 I actually drilled the rivets and removed it before the stricken hull went to the scrapper. If you want pics...
  5. IslandExplorer

    1986 18' Super Sport

    FWIW my Supersport 16 had flotation only under the floors. None under the bow seats (they were storage) or the cockpit seats (pedestal stbd and a back to back seat to port with batteries). I replaced it all myself when I had the floor out so knew it was back to 100%. I had the boat flooded one...
  6. IslandExplorer

    New Exhaust Manifold surface prep? 4.3 Mercruiser

    Ford used to run iron to iron with no gasket on some engines exhaust manifolds believe it or not. Iron under pressure can be a great sealing surface that won't burn away when smoking hot unlike paint. I'd take that paint off with a flat file. My exhaust manifold directions actually rec to do...
  7. IslandExplorer

    1974 Chieftain 25 "Adventurer" Restoration

    Intake manifold quick test fit, everything seems to match up nicely. It's a Ford Bronco roller 302 that I will be marinizing for this project.
  8. IslandExplorer

    1974 Chieftain 25 "Adventurer" Restoration

    Surprise rebuild parts for the 302 🥳 compliments of my awesome brother! What a great surprise. 😁
  9. IslandExplorer

    1974 Chieftain 25 "Adventurer" Restoration

    The ol small block is getting a little taller before installation thanks to the new "Edelwok" dual plane manifold that came in. She's going to be running coolant through her veins so went with a nice light aluminum manifold that will actually fit my 302 with factory heads and 4bbl Holley.
  10. IslandExplorer

    1974 Chieftain 25 "Adventurer" Restoration

    I've only ever had a Quadra jet on an old yard truck, but it always seemed to run! Well hopefully I can get the Holley going with slightly smaller jets or maybe it will run as is. Still quite a ways off from starting it so time will tell. How many CFM is the quad on your 4.3, happen to know...
  11. IslandExplorer

    1974 Chieftain 25 "Adventurer" Restoration

    Picked up a nice lower cfm marine 4 barrel Holley to replace the non-marine 2 barrel Holley that I had. Came off a 351 Windsor boat. Thinking I'm going to go down a jet size or two. Anyone run a ~600 or lower cfm Holley on a 302 that has some input on this? I know they put both 2 and 4 barrels...
  12. IslandExplorer

    1974 Chieftain 25 "Adventurer" Restoration

    The log manifolds seemed hopelessly corroded inside, I didn't even bother digging all those huge rust flakes out of them. I think the rust was wreaking havoc with flow and insulating whole areas. It was discouraging to see but I decided to take the hit and commit to saving up for new, better...
  13. IslandExplorer

    1974 Chieftain 25 "Adventurer" Restoration

    Still haven't given up on her, thanks!
  14. IslandExplorer

    Ford Mercruiser 188 Rehab and Cooling

    Interesting that they used a Y pipe on those systems you mentioned. Was that for convenience or is there an advantage vs just 1 larger seawater pump?
  15. IslandExplorer

    Ford Mercruiser 188 Rehab and Cooling

    It is a really simple looking exchanger, much like the San Juan units I've seen. Has only 4 ports other than 2 small threaded drain or vent holes, 2 coolant, 2 raw water. It's supposed to be a triple pass I think. Made by Sen-Dure.
  16. IslandExplorer

    Ford Mercruiser 188 Rehab and Cooling

    The system I read about that sounded the most like mine had the engine coolant controlled by the thermostat with a small bypass passage to keep coolant flowing through the exhaust a little even when thermostat is closed fully/still warming up. Going to have to find one like that probably. The...
  17. IslandExplorer

    Ford Mercruiser 188 Rehab and Cooling

    I wasn't able to find an 888 full cooling sytem setup example from Mercruiser. This model seems like it wasn't as common so maybe there wasn't a factory full system setup, I don't know. Since the parts are rare if not non existant anyway- I am fine with doing a non standard setup/ copying...
  18. IslandExplorer

    Ford Mercruiser 188 Rehab and Cooling

    Also, after thinking about it more, I am leaning toward not using the X raw water block. Like you said, without proper tear down and rebuild I just can't clean it that well.
  19. IslandExplorer

    Ford Mercruiser 188 Rehab and Cooling

    Good point, I'll definitely need to keep the pump in there then. I already have a new one anyway. Too bad those pumps don't put out more flow bc it would be nice to use it for the heat exchanger and be done. If I kept the pump but removed the hose by the bellows and sealed the transom pass thru...
  20. IslandExplorer

    Ford Mercruiser 188 Rehab and Cooling

    Thanks for the quick reply Scott, I will be running a full system so that the risers and HX will be the only raw water cooled parts hopefully. Definitely good to know the drive still needs to be cooled. Was really hoping to lose the drive pump though! Maybe I'll replace it with a drive shower...
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