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  1. Scott Danforth

    Is the Mercruiser 7.4 Gen V an interference motor?

    Pull the manifold and look in the port. Most likely you will find rust Or you ran lean and tuliped the valve
  2. Scott Danforth

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

    Look for rust buildup on the valve stem
  3. Scott Danforth

    1989 Sea Ray 160

    Only metal filters allowed. If the filter breaks, you explode If there is a fire, the filter goes first and you explode
  4. PXL_20220709_142824010.jpg

    PXL_20220709_142824010.jpg

  5. Scott Danforth

    1989 Sea Ray 160

    That is against regulations and illegal in a bilge
  6. 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...
  7. 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...
  8. 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.
  9. 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...
  10. 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
  11. 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?
  12. 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
  13. Scott Danforth

    Color me noob- Finding common leaks

    Pull the drive and inspect the bellows
  14. 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
  15. Scott Danforth

    4.3 motor swap with truck engine

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

    Rapid trailer jerk at higher speeds

    doesnt matter if the air comressor is there. the shocks lost all dampening function
  17. 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...
  18. 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.
  19. 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...
  20. 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
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