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  1. Scott Danforth

    MerCruiser 4.3lx shortblock compatibility?

    correct, to go over .43", the valve seals need to change and the valve stem guides need to be skimmed.
  2. Scott Danforth

    I freeze my block so you don't have to!

    you may want to check that. at -20 there is a potential for a higher delta t, and there is less BTU's to remove to get the block to freeze.
  3. Scott Danforth

    2002 191 Starcraft Islander Stiff Throttle

    Post pics of the side panel and studs. Someone installed it, removal is just reversing the steps
  4. Scott Danforth

    OMC tank color

    0.01 second search with google https://www.aomci.org/forums/topic/finding-color-codes-for-oem-replacement-touch-up-paint/
  5. Scott Danforth

    OMC tank color

    I would avoid a rattle can and simply get a $15 spray gun from harbor freight and used hardened enamel
  6. Scott Danforth

    MerCruiser 4.3lx shortblock compatibility?

    You can use your current marine cam, which is remarkably similar to the truck cam. If it was me. 1996 or later 5.7 liter V8 from a truck, new exhaust manifolds, weekend to change it over ....... Then go boating
  7. Scott Danforth

    1986 Mercruiser 470/170hp/3.7L Carb backfire, low vacuum, other weird issues

    I would drain the coolant prior to the leakdown test. I would also re-test the water jacket
  8. Scott Danforth

    MerCruiser 4.3lx shortblock compatibility?

    The PO states in post #1, his block is toast.
  9. Scott Danforth

    1986 Mercruiser 470/170hp/3.7L Carb backfire, low vacuum, other weird issues

    Here is a picture of the open deck. see how any combustion gasses seeping past the cylinders except that little bit of landing in the middle would have to go into the cooling water jacket. here is a picture of the open deck being closed for a high-performance hot-rod build.
  10. Scott Danforth

    1986 Mercruiser 470/170hp/3.7L Carb backfire, low vacuum, other weird issues

    the pressure test says that your head gasket where the cooling passages are is in tact. being an open deck block, it would be unlikely for combustion to transfer from one cylinder to another without entering the combustion side. you did have the cooling water drained when you did your test...
  11. Scott Danforth

    I freeze my block so you don't have to!

    wait until ambient air in the garage falls to 20 and you will see your block temp drop quicker. right now your still at 25ish with an 37 degree block. you have a thermal mass of iron in the 400# range. knowing that ductile iron has a k factor of about 70, you should be able to calculate the...
  12. Scott Danforth

    Increase power 1993 150 proV

    Time to understand how a carb works, Bernoulli's principle, and what a carb signal is.
  13. Scott Danforth

    1986 Mercruiser 470/170hp/3.7L Carb backfire, low vacuum, other weird issues

    When setting points, going to quote my father and high school autos teacher..... feeler gauge is close, setting with a dwell meter is accurate
  14. Scott Danforth

    Increase power 1993 150 proV

    swapping to bigger carbs means the signal other than WOT is lost and drivability from idle to mid-range suffers.
  15. Scott Danforth

    Swapping engines 2004 90hp mercury to a 1989 125 Force wiring

    why step 15 years backwards to an obsolete motor?
  16. Scott Danforth

    MerCruiser 4.3lx shortblock compatibility?

    FWIW, I start a big block without a choke and dont have start issues or idle issues. throttle to 1/3 for the first 30 seconds or so for it to clear its throat. then as I deal with lines, etc, the motor warms up to about 120, and I am off I used to runt a 360 mopar without a choke in wisconsin...
  17. Scott Danforth

    MerCruiser 4.3lx shortblock compatibility?

    then you didnt tune the carb right
  18. Scott Danforth

    Boat wont start

    Pull plugs and try to turn it over. if water comes out, you have trouble shooting steps ahead.
  19. Scott Danforth

    1986 Mercruiser 470/170hp/3.7L Carb backfire, low vacuum, other weird issues

    I would look at timing. if you havent set dwell with a meter, start there
  20. Scott Danforth

    MerCruiser 4.3lx shortblock compatibility?

    You can get low mileage running 4.3 motors for under $200
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