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  1. Scott06

    Omc 4.3? What did i buy?

    What you have is a 175 hp 2 bbl engine with rebuilt long block, likely was overheated causing the head gasket blowing. I wouldn’t mess around with it, juice isn’t worth the squeeze. have the heads and block deck checked, take the pan off check the bearings out, plastiguage the clearances. If ok...
  2. Scott06

    Need help selecting new prop - 89 Wellcraft 210 Classic

    You mention trying a 4 blade, that really depends on how you use your boat. I have run several 4 blades on my last two boats Because my primary use is loaded (people) water sports-skiing, boarding, tubing. In terms of holeshot, stern lift, and lower planing speed I saw nice improvements. if...
  3. Scott06

    Fuel burn with 5.7 LX mercruiser, 24' Boat

    Yes obviously the gaskets and needle and seat are important, I was just trying to reinforce that proper cleaning of the carb is the hardest thing for a home rebuilder to get right. You see lots of posts where people rebuilt the carb and still have carb issues, done it myself...also worth...
  4. Scott06

    Fuel burn with 5.7 LX mercruiser, 24' Boat

    I’ve had good luck with mikes carb shop in WA. the kit isn’t going to fix it, properly cleaning the carb body all the passages is where most go wrong, make sure to soak it in cleaner blow all passages out and stick a thin wire through them. I would suspect your idle transition slots are gummed...
  5. Scott06

    Omc 4.3? What did i buy?

    I think the flat tappet means the block is an 85-86. Will it work I would think yes but will make less power than a vortex 1996 and up engine. the flywheel size maybe smaller on the older engine may cause a coupler fitment issue. I think in 91 went to a 14” flywheel From 12&5/8” starter is...
  6. Scott06

    Lower Shift Shaft Bushing and Seals Kit??

    If you cant find a serial post a picture of the transom assy- likely some here can tell you what approximate vinatge it is
  7. Scott06

    Lower Shift Shaft Bushing and Seals Kit??

    Yes the drive is an alpha one, but there is a separate serial number for the transom assembly The R, MR, and Alpha ones are direct bolt in swaps for the earlier MC1 drives, so it is possible a later drive can be bolted to an earlier transom assembly. The seal kit mentioned says it fits all mc1...
  8. Scott06

    Fuel burn with 5.7 LX mercruiser, 24' Boat

    Rebuild the carb Weber and currently made edlebrock marine carbs are easy to tune. when was the last time carb was gone through float level set etc. usually what you are describing is a problem with the idle transfer slots maybe plugged up. should transition smoothly no issue if working properly.
  9. Scott06

    Lower Shift Shaft Bushing and Seals Kit??

    Based off the OD number merc and Sierra equivalent. I believe these are good for earlier mc1 bell housings if you are still running the original mc1 transom housing. bushing and seal kit merc part 23-805041A2 sierra 18-2622 oil seal (upper) merc 26-816464-1 sierra 18-2054 if it is worn the...
  10. Scott06

    Removing remnants of elbow to manifold gasket on still attached manifold

    Stuff a large rag or wad of paper towels in the exhaust opening while you are scraping. Rick is steering you straight on what to use and how to make sure it is flat when you regasket it, just takes a little birt of elbow grease to get it done.
  11. Scott06

    Stroker engine build

    Factory mercruiser exhaust is a wet system. Water is introduced to the exhaust gases after the elbows on top of the manifolds. If you have a bigger (aka longer duration and overlap) cam you'll suck water into the combustion chambers. High performance/boderline racing engines will use a dry...
  12. Scott06

    HP sizing on Chap 23 SSI

    Unfortunately with a bravo iii repro is an expensive hobby. i think a set of 4x4 props like hill marine would help. Reality is it should be had a 6.2 ....
  13. Scott06

    Stroker engine build

    You’ll be fine with9.2 compression. Stock was 9.4 and works on 87 octane.
  14. Scott06

    HP sizing on Chap 23 SSI

    23 ft. boat I’d hold out for the bigger engine. My good friend has a 24 ft deck boat , one he bought new after it sat at the dealer, got a great deal etc... Has a 350 mag with 300 hp. It is adequate at best, needs a fair amount of throttle to stay on plane.
  15. Scott06

    Cold water coming out the prop and not much out ports

    If you have could water co,I gout the prop and nothing coming out the engine most likely is water pipe connecting discharge of pump to upper part of the outdrive or seals in there. It’s easy to misalign that pipe when putting the drive halves together. If the water leaks out here it is in the...
  16. Scott06

    Tahoe q7i prop

    Three of my friends boats, all 19-21 ft lake bow riders (two bayliners one four wins) all with 5.0s(two carb 220 hp, one 260 hip mpi) all came factory with 1.62 drives. My sea ray 200 factory used a 1.62 for both carb and mpi 5.0s and mpi 4.3. The 4.3 carb came with a 1.84. I think you have a...
  17. Scott06

    5.7V8 with a 1.84 alpha one gear ratio

    I would start with 4” more pitch than what was on there, 23” if you dont know. Would second to start with an aluminum until you rough it in, unless a prop shop will let you try a bunch. I think you have an advantage here In That a 23 ft is a fairly large boat for a 5.7 to push so the steeper...
  18. Scott06

    Tahoe q7i prop

    The ignition module has a rev limiter in it so you can’t overdo it
  19. Scott06

    Tahoe q7i prop

    I think typically a 5.0 carb engine will have a 1.62 ratio in this size boat.
  20. Scott06

    1998 Volvo Penta 4.3L GL

    I did the same swap in my searay 200. The side motor mounts and front of the engine are 4” farther forward. My boat was set up with motor mount stringers that accepted either the 4.3 or 5.0. So as long as you have room in front it would be worth it.I wouldn’t bother if you have to move the rear...
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