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  1. Scott Danforth

    Needing higher rpm

    An 18' pontoon with a 40hp will do about 22mph. Many times adding more HP just makes more noise and burns more fuel Is the toon transom rated for 115hp? Is the motor high enough? Where is the AV plate with respect to the water while you are underway? Most pontoon installations have the...
  2. Scott Danforth

    454 information

    Not always Make sure to verify the crank part number The magnum was assembled in house from parts out of the GMPP parts bin using an assembled short block and rectangular port heads. The other came in a crate from GMs Tonowanda engine plant as a long block with oval ports
  3. Scott Danforth

    Understanding the numbers on my boat?

    if you cant tell the difference between a 2-stroke and 4-stroke. you are destined to pay someone who is honest to work on it for you.
  4. Scott Danforth

    "Flat" pontoons

    if you crush a beer can, you cant un-crush it. same goes for toon logs. without a pic, i say you have scrap.
  5. Scott Danforth

    Should I be worried before buying?

    Looking at the pics, the keel was repaired once prior. Also the first pick appears to be a hole, not just a scrape Agree cost of repair can vary. I would talk to a local fiberglass repair shop to get an estimate
  6. Scott Danforth

    1988 Chaparral

    Any fiberglass boat older than early 2000's should be considered a project and have rot The 4th sticky down has all the information you need to restore your boat. Read links 14, 15, 18, 2, 3, 4a, and 4b in that order. Look at every picture, watch every video
  7. Scott Danforth

    Rocker torque on aq205a

    You have adjustable value train. So 1/2-3/4 turn past zero last
  8. Scott Danforth

    3.0 MPI distributor? Specs needed

    There is also the 4-cylinder DIS systems that have MAP sensors and can be programed for spark mapping http://www.sdsefi.com/cpiauto.htm
  9. Scott Danforth

    3.0 MPI distributor? Specs needed

    I agree with in principle with a caveat If you are under boost all the time, then the 23 degree curve may be ok. However it will drink fuel more than a V8 The points can be used as a trigger for the MSD, therefore never wearing There are better alternatives to pertronix At low boost / light...
  10. Scott Danforth

    454 information

    If the old engine and new heads are both oval or both rectangular. The whole induction can be reused. The exhaust can also be reused. With a small spacer, the whole accessory drive can be used
  11. Scott Danforth

    454 information

    I can give you a naturally aspirated boat motor at 7.4hp running a carb close to 500hp or 250 hp. I can take that same 7.4 liter displacement in a non-marine application and get well over 800hp with a carb or EFI has nothing to do with how big the cake is, it depends on the ingredients and...
  12. Scott Danforth

    3.0 MPI distributor? Specs needed

    Did you reach out to Tom? he usually answers back within a day.
  13. Scott Danforth

    454 information

    the standard 7.4's are oval port motors the magnum is a rectangular port motor with a different cam
  14. Scott Danforth

    Voting for 2023 Splash of the Year!

    Can @mickyryan vote twice?
  15. Scott Danforth

    Flotation foam

    transom should be 2.00-2.25" thick outer fiberglass (about 1/4-3/8" thick) 1-1/2" of wood inner fiberglass
  16. Scott Danforth

    Wood working questions

    Make a wood jig to hold the piece and use the table saw.
  17. Scott Danforth

    Wood working questions

    Or a finger splice .......
  18. Scott Danforth

    3.0 MPI distributor? Specs needed

    I believe it does. however I would want to visit NAPA or your local FLAPS and verify prior.
  19. Scott Danforth

    Wood working questions

    not sure on the expansion. I would use tite-bond III (mainly because I have lots of it)
  20. Scott Danforth

    454 information

    The block is just a GM block Prep for marine use: Brass core plugs Marine cam Marine head gaskets Marine water circulation pump Your motor is a 1970-1990 Mark IV big block I personally would look for a 1996 or later Gen VI
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