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  1. Scott06

    Gimbal bearing

    No all the same size assuming you were sent the correct one. Is it missing the tolerance ring that goes around it? It should be a tight fit unless the lip where it seats into the gimbal housing cracked when the old one was removed?
  2. Scott06

    4bbl 350 intake question

    I don’t think there is much difference except the first photo has a universal mounting it can take spread or square bore carbs. There are two sets of threaded holes for mounting the different pattern carbs. One on the right looks like a std GM set up for quadrajet carb only. A square bore like...
  3. Scott06

    2002 Mercruiser 5.0 EGR pipe

    Vortec heads do not have a cross over. I wasn't sure why you were asking- no reason to remove it. I blocked the cross over on a 65 GTO I have ended up taking it out as had trouble getting it to idle until it was really warm. Unless you are changing out to a 4 bbl leave it alone
  4. Scott06

    2002 Mercruiser 5.0 EGR pipe

    When I repowered my 5.0 and upped to a aftermarket intake and edlebrock 1409 there is no provision for this and it works fine. I don’t think this is egr but rather heating like on a exhaust cross over on pre vortec engines If you look at places like Michigan motorz who sells partial engines...
  5. Scott06

    Engine oil choice 1984 3.8l

    Those are not the batwing manifolds that had casting issues and can leak water into engine. If they are not corroded or cracked leave them alone. Most freshwater ones last the lifetime of the boat if they don't get freeze damaged
  6. Scott06

    projects other than boats

    I use the Diablo 80 tooth ones for both seems to do pretty good cost vs performance. I paid $35 for my table saw at a yard sale, its funny to pay more for the blade
  7. Scott06

    projects other than boats

    I'm halfway through doing about 1200 sq ft of hickory flooring, can vouch for the blades getting dull. On my second miter saw blade so far... At least it will hold up well.
  8. Scott06

    Mercruiser 3.0 Engine knocking noise

    It’s not uncommon for engines to start making noise after getting hot. Water in the oil never helps. As the group has mentioned there are a few items to look at otherwise pull the engine and tear into it.
  9. Scott06

    Very Low Compessions on Mercruiser 5.0 MPI Engine. with Exhaust Manifold, Thermostat Housing Removed.

    Yeah that much corrosion would also think it was a U boat , maybe why it got parked. If that is the case will need more than a head gasket
  10. Scott06

    Mercruiser 3.0 Engine knocking noise

    agreed, but also would think the flywheel would come off over that time ?
  11. Scott06

    prop recommendations for Trophy walk around 25 foot

    you don’t . Yeah something doesn’t add up, unless gear case is different ratio. As you said we’re more interested in this thread than the OP. thanks for sharing those real world numbers. I wonder what max hp rating is for that boat
  12. Scott06

    Very Low Compessions on Mercruiser 5.0 MPI Engine. with Exhaust Manifold, Thermostat Housing Removed.

    Would also look for signs of water intrusion in the exhaust as that could hang up valves . Might be worth doing a leak down test before pulling head off to pinpoint where u are loosing compression doing a cold compression test would typically expect slightly lower numbers as when engine is up...
  13. Scott06

    Mercruiser 3.0 Engine knocking noise

    No there is a sleeve under the bolt like that this looks correct .
  14. Scott06

    prop recommendations for Trophy walk around 25 foot

    Could be wrong but I would think that based off the comment below. if he knew his current rpm would think it is fairly easy to estimate about 400 rpm drop going up 2”, and 800 rpm drop going up 4” in pitch assuming staying with similar prop type. Maybe I misinterpreted but cant imagine if the...
  15. Scott06

    prop recommendations for Trophy walk around 25 foot

    I think if you read his post he is hitting the pm limit before throttle is fully open, hence “we won’t know “ of course he hasn’t been back so we are just talking to ourselves
  16. Scott06

    Towing Boston Whaler 130 with Honda CRV

    you realize you are quoting your own posts here? why are we hijacking this guys thread talking about lawyers WTF?
  17. Scott06

    Mercruiser 3.0 Engine knocking noise

    the front of the motor items are water pump, gear drive for cam shaft, fuel pump, cam and lifters are accessible on starboard side behind covers. Any of those items could be damaged by lack of lubrication due to water in oil.
  18. Scott06

    Mercruiser 3.0 Engine knocking noise

    One I didn't think of - can you check with a pry bar ?
  19. Scott06

    Mercruiser 3.0 Engine knocking noise

    Can you narrow down where the noise is coming from? have you run it with out the drive and taken the belts off to see if it is an accessory or water pump, gimbal bearing ujoint etc? Flywheel loose? Would spend some time trying to figure out where it it coming from - loose rocker ?
  20. Scott06

    Easiest engine drop in replacement for 1986 MCM 470

    I was under the impression the 3.7 used a Chevy bellhousing bolt pattern but could be FOS Maybe @Scott Danforth or @nola mike may know Scott and Mike - OP wants to swap his 3.7 for a 4.3 (preferred or maybe 3.0) does the 3.7 flywheel cover (alpha one gen 1 drive so later mount spacing) fit a...
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