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  1. Scott Danforth

    What´s the best replacement for AQ271C (or 570) 5.7 GM engine, ideally stroker?

    first, please understand torque is what makes the boat go. HP is just a function of torque and RPM lets break down the 271C its a generic 5.7 short block with small chamber (64cc) police package / performance crate motor heads and a 715CFM vacuum secondary 4-barrel carb hence the 271-275hp...
  2. Scott Danforth

    Crank-driver raw water pump upgrade

    you need the anti-rotation bracket to go with the pump. here is a page that lists the Johnson pump anti-rotation brackets https://inetmarine.com/crankmountedpumpsandkits.aspx
  3. Scott Danforth

    980 hours on engines - compression test

    yes, 80 grit on the intake, 200 grit in the combustion chamber and as smooth as possible in the exhausts. be careful shipfitters disease does not kick in.... otherwise while the engines are out you may go to stroker cranks, build a pair of 496's
  4. Scott Danforth

    2001 mercruiser 305 alpha drive to couple year older 350 engine

    casting comes back as 1980-1985 crate motor
  5. Scott Danforth

    2001 mercruiser 305 alpha drive to couple year older 350 engine

    BTW, with the motor that old, it probably has 76cc smog heads on it, so its power at most would be about 210hp. which is less than the 5.0 you pulled out of the boat.
  6. Scott Danforth

    2001 mercruiser 305 alpha drive to couple year older 350 engine

    yes, the balance on the flywheel is more critical than you think. are the valve cover bolts perimeter bolts or center bolts? post the block casting number and we can narrow you down to see if the motor is at least only 40 years old
  7. Scott Danforth

    How many gallons of resin?

    the last thing to rot in a boat is the floor, the first thing is the transom and stringers. from the looks of the pic, you are not done with demolition. for a 19' boat, minimum amount of resin for transom stringers and floor would be in the 15-20 gallon range.
  8. Scott Danforth

    2001 mercruiser 305 alpha drive to couple year older 350 engine

    look at the block casting number. not the serial number. no, it can not be a one-piece RMS motor with a larger bolt pattern. there are two crank patterns for an SBC. the 2-piece RMS and the smaller 1-piece RMS
  9. Scott Danforth

    Kill Cord does not operate properly (not electtical)

    take it to the dealer
  10. Scott Danforth

    Mercruiser 5.0 TKS vs 4.3 MPI

    there is no power benefit from EFI, there is no fuel economy benefit from EFI. the benefit comes from its ability to adjust for differing atmospheric conditions and to constantly monitor combustion events to pull back timing and fueling to prevent detonation as @Scott06 and I stated...
  11. Scott Danforth

    Mercruiser 470 head and gasket inspection

    if you pressure tested the block, the block should have been empty. you do the cooling side pressure test empty.
  12. Scott Danforth

    2001 mercruiser 305 alpha drive to couple year older 350 engine

    a 2-piece rear main seal is 1985 or older.
  13. Scott Danforth

    Mercruiser 470 head and gasket inspection

    You didnt do a pressure test?
  14. Scott Danforth

    1995 OMC 5.0L Winterizing

    At best you could open all the drains and sample the antifreeze and test its specific gravity.....or just drain it
  15. Scott Danforth

    165 L6's out of the bertram. What do they need?

    if the motors are healthy, you have it covered.
  16. Scott Danforth

    1980 Dyna Trak 176 drain bait/livewell???

    Owners manuals for boats at best are a 4 page safety brochure indicating the round thing you hold is the steering wheel, the pointy end is the bow, and the end with the prop is the stern. There is also a list of servicing dealers. Only 5 out of hundreds of thousands of boat manufacturers ever...
  17. Scott Danforth

    4.3 Mercruiser with only 3 water drain holes.

    And if its 1996 and newer, there is one on the intake manifold T-stat cross over
  18. Scott Danforth

    Flooring HELP

    I cant get PL to stay adhered to wood.....seriously doubt it will remain adhered to aluminum
  19. Scott Danforth

    1995 OMC 5.0L Winterizing

    fastest way to a cracked block. factory manual says drain everything
  20. Scott Danforth

    Re-secure Snaps?

    stock snaps have #8 screws. the over-sized have #10. you can also get the snaps that do not have the included screw and then thru-bolt it.
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