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  1. Scott Danforth

    1973 Starcraft SS 18 I/O

    check the head and the exhaust manifold. water got into cylinder #4 from either a bad head or a bad manifold
  2. Scott Danforth

    Any idea which drive this is?

    Clymer manuals make bad toilet paper and worse manuals. You will need the Volvo manual. https://www.volvopenta.com/en-us/service-and-support/your-engine/manuals-and-handbooks/ Being that old, you will have to call them (only manuals for after 2000 are on their website)
  3. Scott Danforth

    454 Piston problem

    The mark 4 pistons didn't change for GM much between 1968 and 1989. There are basically the lower CR dished used in the 70s and the flat tops. Measure the bore in 3 locations with a bore gauge
  4. Scott Danforth

    TRAILER WANTED

    where you located? down here in Florida, there have to be 20 boat trailer manufacturers within a 75 mile radius of Tampa, most will even custom make what you want.
  5. Scott Danforth

    TRAILER WANTED

    call trailer manufacturers. with the slowdown in the RV and recreational boat market, they will have inventory or shorter lead times.
  6. Scott Danforth

    Everything done but low rpm at WOT. Distributor spring?

    post #12 had the carb number Carb is 4bbl Holly 1850-5. Numbers on the horn are 1850-5 1692 its a 600 CFM Holley Street carb with brackets for the kick-down linkage
  7. Scott Danforth

    Part Identification

    I think AD figured out the picture.
  8. Scott Danforth

    No Power to Boat

    check with a volt meter. look to see where the voltage stops
  9. Scott Danforth

    7.4 flame arrestor to KN

    I am running a K&N on my boat for 3 reasons. reason #1, I bought a marine K&N assembly used for $30 off facetube market place from a wrecked boat with a carbed 502 reason #2, I sold the original Holley spark arrestor with a bunch of AQ271 parts reason #3, a new 4-barrel spark arrestor for my...
  10. Scott Danforth

    Everything done but low rpm at WOT. Distributor spring?

    fuel pressure will point out the Anti-Siphon or pickup tube filter as issues if there is no fuel pressure at anything over idle.
  11. Scott Danforth

    7.4 flame arrestor to KN

    your money, however you wont see any HP gains.
  12. Scott Danforth

    2 Forward bilge pumps?

    does the head directly above have a shower? if so, they are the shower drain bilge pumps because the water has to go somewhere.
  13. Scott Danforth

    Part Identification

    I am going with gag photo
  14. Scott Danforth

    7.4 flame arrestor to KN

    what are you trying to do besides lighten your wallet and add a shiny bit to your engine compartment? your current flame arrestor already flows more air than the motor needs assuming its clean and yes, the vapor tubes get clipped to the air cleaner.
  15. Scott Danforth

    Everything done but low rpm at WOT. Distributor spring?

    what color are the plugs. new isnt a color. white, coffee, or black. if your plugs are white, you are way way too lean. measure the rocker arm movement with a dial indicator. your valves should be moving almost 0.550"
  16. Scott Danforth

    PDF Service manual for 4.5L

    This thread is older than 90 days.
  17. Scott Danforth

    Shifting system

    Of the 3 cables. The lower shift cable is the one that needs adjustment checked often and is the one that usually needs replacement
  18. Scott Danforth

    1973 Starcraft SS 18 I/O

    I would be looking for a 1992 or newer 3.0 myself. Rebuilding a 3.0 costs as much as rebuilding a 5.7
  19. Scott Danforth

    454 Piston problem

    Agree with AD, only way to put new rings in an engine with more than 100 hours is a bore and hone
  20. Scott Danforth

    454 Piston problem

    The pistons are GM truck motor pistons. A year will help identify if it's a Mark IV, Gen V, or Gen VI
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