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  1. Scott Danforth

    Cold air intake

    No, and definitely NO CAIs increase intake noise, however do not really add any performance to the motor over simply changing your air filter every other oil change Additionally, the MAFS can be damaged by many oiled filters And do you really want to trust your $5000 engine air filtration to...
  2. Scott Danforth

    5.7 Serpentine Belt Tensioner

    Look in the dayco, gates and conti tech catalogs
  3. Scott Danforth

    My boat sank, part II

    Great news Pull the starter and alternator and pull them apart. Hose down with WD40. You can save them Wring harness may have issues in a few years
  4. Scott Danforth

    1995 Sea Ray Sundancer 250

    Would have gone quicker uf you pulled the anti siphon valve
  5. Scott Danforth

    Carb Recommendations for 5.7L Vortec?

    It stems from the performance group at Merc Racing. Ilmor, Indmar, and VP also had 715/750's on their 5.7's
  6. Scott Danforth

    3.0LX - Mercarb to Rochester ?

    rochesters havent been used on 3.0 since 1990 they re-designed the motor in 1991 while the carbs are similar, they are not the same I would simply keep your fuel system clean
  7. Scott Danforth

    WHAT IS IT? Engine has no serial number plate. Either a Mercruiser 120 or 140

    your intake should fit unless the motor is a 1991 or later 3.0. then all sorts of things wont fit. in 1990 the 3.0 was re-designed for the 1991 model year. (they also dropped the 2.5)
  8. Scott Danforth

    My boat sank, part II

    Get the motor hot wired and start it
  9. Scott Danforth

    3.0LX - Mercarb to Rochester ?

    Not a direct swap
  10. Scott Danforth

    Need Help From You Guys That Have Prop Efficiency Calculators

    Higher temps mean lower NOx
  11. Scott Danforth

    1977 18’2” BeachCraft Mercruiser 888 302Ford

    go thru the thread in my signature. I cover making non-skid
  12. Scott Danforth

    WHAT IS IT? Engine has no serial number plate. Either a Mercruiser 120 or 140

    you can look up the GM industrial engines by the casting number. the bore and stroke of the 3 liter (181 cubic inch) is different than the 2.5 liter (153 cubic inch) deck height is also different additionally the casting marks on the side of the block will tell you if its a 153 cubic inch or...
  13. Scott Danforth

    Speedometer Connected to GPS Device?

    VeeThree and Faria both offer GPS speedometers (VeeThree sells thru Sierra here on iBoats) I have 3 issues with GPS speedometers: they are only marginally more accurate than a pitot tube they cost more than a pitot tube they wont last 30+ years until I get bored with the look like a pitot tube...
  14. Scott Danforth

    Need Help From You Guys That Have Prop Efficiency Calculators

    its the same motor for 240 or 250 or if they sell it at 280hp, you just pay a bit more toward the warranty fund.
  15. Scott Danforth

    Carb Recommendations for 5.7L Vortec?

    guessing your boat is about #4000 dry, about #5000 wet the cam you have will require more CFM from mid-RPM up I would definately go bigger. you have more cam than I had with my vortec headed Small Block and I was feeding it with the 715CFM holley running larger jets pushing my 3600# dry...
  16. Scott Danforth

    Over Temperature Alarm Sensor Level?

    I would just order a water pressure gauge. No sensor. A good old fashioned $30 bourdon tube outboard water pressure gauge The water preasure sensors do not last in salt water, where the bourdon tube gauge will
  17. Scott Danforth

    Cobra Outdrive Sucked Up Some Sand

    Keep in mind you will have sand and debris in your engine water jacket to
  18. Scott Danforth

    Over Temperature Alarm Sensor Level?

    See post 12 https://forums.iboats.com/threads/generic-boat-wiring-information-updated-verified.726970/
  19. Scott Danforth

    Over Temperature Alarm Sensor Level?

    I posted links in the electrical forum stickies for sensor catalogs. However I suggest you install a water pressure gauge on the raw water side. With an HX, you will have burned a all the rubber bits in the exhaust for about 5 minutes before your switch goes off and alarm sounds. However with...
  20. Scott Danforth

    Will Any 4" 470 Heat Exchanger Fit?

    The 470 mercruiser HXs only fit the 470s While the bundle may be generic, the whole assembly is specific
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