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  1. Scott Danforth

    454 knocking noise and water in oil after sitting for 4 years

    Fill entire engine with 3-4 gallons of used oil
  2. Scott Danforth

    Antifreeze circulation through engine

    Must go with the name......,.LOL
  3. Scott Danforth

    Anti Seize or Not?

    Permatex #3 or tefgel
  4. Scott Danforth

    Antifreeze circulation through engine

    unless your block was modified by welding the lower drain ports closed, you have the drain ports use them if you try a block-buster 2000 kit or a scam-co kit, count on a broken block in the spring as Lou mentions no way around draining unless you park your boat in a 10,000 gallon swimming...
  5. Scott Danforth

    Piston Damage?

    post a full-size version of the pic looks like old damage. I would run it. Then again I ran a 4.1 Buick V6 with 3 carburetor screws mashed into a piston for about 60,000 miles
  6. Scott Danforth

    70s force 70... No reaction from key

    start with the correct schematic for your motor
  7. Scott Danforth

    Hi Everyone

    welcome aboard here is some suggested light reading; links 14, 15, 18, 2, 3, 4a, and 4b https://forums.iboats.com/threads/how-tos-and-other-great-information.283508/ all the stickies here: https://forums.iboats.com/forum/mercury-mariner-outboards.27/...
  8. Scott Danforth

    engine pinging and backfires and stalls

    no, you drop the pan fully and if the builder did his job, he used a rubber gasket which you can pull the pan many many many times prior to replacing.
  9. Scott Danforth

    Fountain feedback

    welcome aboard. without knowing which year fountain, or which motors/drives, its going to be hard for anyone to comments. Reggie designed some good boats...... however with high performance boats comes high performance maintenance and high performance part price tags do you have the...
  10. Scott Danforth

    Short Shaft to long Shaft swap

    start with the parts break down and start comparing power head parts.
  11. Scott Danforth

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

    engines after 1986 were prop rated do not confuse peak hp numbers vs other factors. the AQ271C was a VP spec'd Hi-Po crate motor with a custom spec'd cam. same motor that was police duty. run the casting numbers of the heads thru mortec yourself. not the same heads or intake that GM sold to...
  12. Scott Danforth

    Condensation in exhaust manifolds...

    yes raw water and carb was 140 ish unless hx cooled, then 160 ish EFI and raw water is 160 ish EFI and hx cooled is 180 ish cant explain why the 4.5 would have a 140 T-stat the emissions must be on the raged edge.
  13. Scott Danforth

    Carb Recommendations for 5.7L Vortec?

    holley side https://www.summitracing.com/parts/sce-355-1 manifold side https://www.summitracing.com/parts/sce-3584-1 modify as needed with gasket punch for the holes
  14. Scott Danforth

    Condensation in exhaust manifolds...

    remember, you have water flowing thru the exhaust manifolds all the time regardless if the thermostat opened or not because you were on the hose, your motor never got up to temp so you would have condensation or the slight reversion at idle that the 4.3 suffers
  15. Scott Danforth

    Carb Recommendations for 5.7L Vortec?

    or use a tubing bender and bend the two legs of the fuel log.
  16. Scott Danforth

    Multiple layers of fiberglass and laminating PE resin

    I normally try to do all my layup and then after gel, spray PVA over the area to get the last layer of gel to fully kick Then again, in the Florida heat, sometimes the resin kicks fully in the bucket and melts the bucket
  17. Scott Danforth

    Carb Recommendations for 5.7L Vortec?

    90 degree fitting
  18. Scott Danforth

    Hi couple of questions from the uk

    you cant use epoxy with 1708. you need the styrene in the poly to dissolve the binders in the CSM stitched to the 1700 cloth. I would have just used poly. regarding the aluminum screw strips. the screws should have gone to the aluminum. however most boats suffer from very shoddy workmanship...
  19. Scott Danforth

    Carb Recommendations for 5.7L Vortec?

    my dual plane manifold has a reduced height divider I did basically turn a 4-hole to a 2-slot. currently have a 1.25" thick spacer
  20. Scott Danforth

    7.4 L29 cylinder drop test netted no change

    what are your compression numbers? are you prop'd right?
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