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  1. Scott Danforth

    Carb question

    Is the flange still there? If Yes, grab with a vice grip and twist back and forth If not, a left handed drill. Try 5/16 first, then work up Make an installation tool to drive in the new ones. I use a section of metal tube with a slot cut in it with a die grinder so it pushes the flange in...
  2. Scott Danforth

    OMC 460 running rich at idle after higher rpm

    Who rebuilt the carb? A Holley carb is as simple as a toilet. the key is to chase every passage with a piece of wire 650 is a bit small. What are the airhorn numbers? If you had a backfire, you could have ruptured the power valves Which Holley carb? 4150 or 4160? What kind of check valve...
  3. Scott Danforth

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

    He is machining newer heads. Shouldn't have needed new seats.
  4. Scott Danforth

    Volvo Penta 855932 Prestolite 7801A advance springs

    Why are you hijacking a thread? Your distributor is already electronic pickup. You do not need anything that pertronix has for your distributor Back to the OP. @bollerwagon there are 2 different springs in the AQ271c dizzy. That is how they got a knee in the advance curve. Do you still...
  5. Scott Danforth

    Fuel leak

    If there is fuel in the bilge, there are fuel vapors in the bilge. Fix it now or BOOM most likely a steel tank. You will most likely find fuel saturated foam
  6. Scott Danforth

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

    Not much of a problem, however why the valve seat replacement?
  7. Scott Danforth

    Prop for hole shot water skiing

    Drop down in pitch for better holeshot Use trim tabs to stay on plane at lower speeds
  8. Scott Danforth

    Color me noob- Finding common leaks

    Pull the drive and inspect the bellows
  9. Scott Danforth

    Won’t stay running

    Yellow wire with red stripe is crank signal. You wont have wire there unless cranking Check diode at alternator
  10. Scott Danforth

    4.3 motor swap with truck engine

    Those are EFI motors. You wont find a vehicle with a carbureted vortec 4.3
  11. Scott Danforth

    Rapid trailer jerk at higher speeds

    doesnt matter if the air comressor is there. the shocks lost all dampening function
  12. Scott Danforth

    Is the Mercruiser 7.4 Gen V an interference motor?

    if you are spinning the motor fast enough to break a timing chain, yes, the valve would be toast. it is an interference motor however the likely hood of you breaking a timing chain is about 1 in a million. there is only .08" of clearance between the valve opening and the piston in a few...
  13. Scott Danforth

    How to build a front middle cushion support

    a piece of 1/2" starboard (about $35) should be a recess in the fiberglass. put a piano hinge in the middle cross-was so it will fold to make it more stowable.
  14. Scott Danforth

    4.3 motor swap with truck engine

    here is a set of heads, intake and carb for $500. should be able to get it for $400 cash https://providence.craigslist.org/bpo/d/coventry-gm-vortec-43-v6-marine-heads/7504298393.html iron 2-barrel marine - offer $50...
  15. Scott Danforth

    Does anyone have pic of distributor on Merc 7.4 Gen V?

    Cylinders 5 and 7 could be steamed cleaned from water leaking into the ports Verify your timing Check compression (should be 150psi on all cylinders) Check your fuel
  16. Scott Danforth

    4.3 motor swap with truck engine

    Vortec heads are an honest 20hp because of the chamber shape. Used iron vortec manifolds are $50 or less PMGR starter is 22# lighter than a direct drive starter, uses half the power and has twice the torque You use nothing bolted to the truck block and heads. You have to use the marine stuff...
  17. Scott Danforth

    pressure in upper gear case

    my stringer 400 had a small hole worn in the impeller housing from a stone that wedged itself under a blade and managed to pump force enough water into the gear box and pull enough gear oil out that the bearings seized 1/2 mile from the ramp.
  18. Scott Danforth

    5.7-300Gi-J starter bolt length

    PMGR starters use shorter bolts than direct drive starters.
  19. Scott Danforth

    Rapid trailer jerk at higher speeds

    also, if the aft shocks on your SUV are at all worn, the boat will wag the car.
  20. Scott Danforth

    VP AQ280 operating instructions

    a Volvo AQ290 drive uses a slightly larger hole and has full Tilt-n-Trim
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