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  1. Scott Danforth

    Why do they make 12 point sockets and wrenches?

    'nuff said
  2. Scott Danforth

    Likely cause of compression loss in cylinder 1

    there is no "likely cause" you need to do a leakdown test to determine what is the reason here are possible reasons (not in any particular order) leaking exhaust manifold causing rusty valve or valve seat (if so, other valves may be close behind) broken rings hole in a piston from detonation...
  3. Scott Danforth

    3.7 L 170 188 190 224ci mercruiser

    lets not. its been rehashed to death. however for some reason the search function isn't pulling up the past lists. assuming you have all the updates done over the years...... larger heat exchanger, exhaust elbow change, etc. so much easier and cheaper to pull the motor and drop in a proper...
  4. Scott Danforth

    Cracked spark plug porcelain-timing?

    are you looking used or looking new? if you are looking new. buy the new ones that have been modified for proper seals and screw in studs. thats about $900 thru GMPP. you can also get them thru Summit Racing if you are looking for used. any good machine shop, especially ones near an oval...
  5. Scott Danforth

    Cracked Block???

    the first of a few hundred thousand would be my guess https://forums.iboats.com/threads/frozen-and-busted-blocks-in-texas.742470/#post-5642840
  6. Scott Danforth

    1986 power head source

    would help to know where you live. plenty of rebuilders in every major location.
  7. Scott Danforth

    Fuel burn with 5.7 LX mercruiser, 24' Boat

    the beauty of the carb is it will flow only what the motor needs. on top of that, keep in mind the 4.3's get 600-650 CFM carbs, the 5.0's get 650-700 CFM carbs, the 5.7's get 700-750 CFM carbs and the 7.4's and 8.2's got 800-1050 CFM carbs your fine on the carb
  8. Scott Danforth

    OMC 2.5L milky oil after short time

    Any 3.0 1990 or prior will work
  9. Scott Danforth

    Frozen and busted blocks in Texas

    There are 580,000 boaters in Texas. Not a single one of those boats were winterized....... Since about 250,000 of those boats are I/Os and only about 50,000 are moored..... There are about 200,000 motors that have suffered a thermal declination related phase-shift inspired block busting event...
  10. Scott Danforth

    Cracked Block???

    if you didnt drain all 5 drain locations (intake manifold t-stat cross-over, block drains and manifold drains). expect to have a busted block...... and exhaust manifolds regarding home-owners insurance, that is between you and the insurance company.
  11. Scott Danforth

    OMC 2.5L milky oil after short time

    I would never trust the manifold myself. only way to test the block is to pressure test it, or take to a machine shop and mag-particle it.
  12. Scott Danforth

    Cracked spark plug porcelain-timing?

    wait a minute.....back the truck up. generally stock 305 heads have too small of valves for a 350 and have too small a combustion chamber to run on pump gas without the motor detonating like teenager boys at their first peep show. what head casting do you have? very specific. if you have...
  13. Scott Danforth

    Cracked spark plug porcelain-timing?

    if the new 5.7 is a vortec, your plugs are way too short.
  14. Scott Danforth

    Cracked spark plug porcelain-timing?

    loose spark plugs would prevent proper heat sinking and the plugs get hot, cracking the porcelain
  15. Scott Danforth

    OMC 2.5L milky oil after short time

    now acetone test the manifold. if the manifold was cracked on the outside, it may also be cracked on the inside.
  16. Scott Danforth

    OMC 2.5L milky oil after short time

    gotta go with new on the vertical driveshaft. the internal splines wear, then strip and leave you stranded needing a tow. 100% of the vertical driveshafts will fail - its a design flaw. the used one you bought will most likely fail soon as well. look at the splines.
  17. Scott Danforth

    Running spare hot wires....

    I would pull some poly chord thru to allow you to easily pull what you want in the future. I have pulled spare wires in the past, howeve most of the time what I thought I would need in the future is not what I actually needed
  18. Scott Danforth

    Merc 4.3l timing question, BTDC mark

    first, AD has you straighted out on the timing tape and RH vs LH motors. secondly, post #2 would indicate that you did not shunt the two wires and put the motor in base timing mode.
  19. Scott Danforth

    Why is my boat sitting lower than the waterline ?

    Welcome aboard. as GM stated, additional weight on board is the only thing that will cause it to sit lower. pull the boat and weigh it. compare it to specs. to sit 2-3" lower on a 25' boat would mean you have about 200 gallons of water on board so prepare for a full gut-n-restoration...
  20. Scott Danforth

    Hull extension for mysterious vessel

    I hope you really really like projects this pic alone indicates there is something amiss with the transom those brown streaks are indicators of rot. the bracket looks like its aftermarket, meaning the boat may have been designed and built with an I/O, then converted converting a boat and...
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