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  1. Scott Danforth

    1997 4.3GS with Holley 4 barrel with flat spot on acceleration at 3500 rpm

    I would think a #65 power valve would be a bit rich until the RPM's came up
  2. Scott Danforth

    1997 4.3GS with Holley 4 barrel with flat spot on acceleration at 3500 rpm

    the R75007 is the list number Here is the Holley list. https://documents.holley.com/techlibrary_carb_numerical_listing.pdf
  3. Scott Danforth

    1997 4.3GS with Holley 4 barrel with flat spot on acceleration at 3500 rpm

    what is the holley list number on the air horn
  4. Scott Danforth

    Mercruiser 5.0 TKS vs 4.3 MPI

    c'mon, the Chrysler products often had AFB's...... some of us ran dual quads (small 600 CFM carters on a dual quad manifold on a 383) and then some of us did stupid things with a pair of 500 CFM holley 2300's and two turbochargers on a 4.3, then when it blew, we moved the setup to a stock Big...
  5. Scott Danforth

    Multifunctional Gauges

    assuming you have the NMEA gateways, etc.
  6. Scott Danforth

    Mercruiser 5.0 TKS vs 4.3 MPI

    the carb motor curve will have a higher peak to the torque curve vs the EFI having a flatter curve. this is partially because the cam LSA changes for the induction (reference the Mercruiser HP500 in both carb and EFI.... same HP rating at WOT, slightly different torque curves) the EFI motor has...
  7. Scott Danforth

    Alternator & Cable Upgrades

    there is no debate, not sure why you are coming across as confrontational wireing depends on the alternator you have. Delco, Mando, etc. however there should be at a minimum, the ground cable, the battery charge cable and an excite cable from the ignition (usually purple). you will need to...
  8. Scott Danforth

    Multifunctional Gauges

    first, the seloc manual has more mis-information and wrong information than correct information. what does the factory manual say? second, so you have smartcraft...... however the only gauge shown on your dash that would be smartcraft is still only the tach. and since you dont have a digital...
  9. Scott Danforth

    1997 4.3GS with Holley 4 barrel with flat spot on acceleration at 3500 rpm

    or simply spend $8 on a new power valve. ($11 on amazon if you want it tomorrow)
  10. Scott Danforth

    Dull bassboat

    there are no quick fixes for fadef clear. Your boat was intended to last 15 years and be replaced. Most likely you are into a re-paint or re-gel
  11. Scott Danforth

    Riser Removal w/ Remote Oil Filter Attached

    Use a zip tie and tie off the filter to the alternator
  12. Scott Danforth

    multiple configurations for leaf springs???

    There are about 30 spring configurations and about 20 variations of ratings . So replace what you have with the exact sames style, rating and configuration
  13. Scott Danforth

    Will it Freez

    Not if you leave the motor lowered. Only if you tip it up can water pool in the lower and then freeze
  14. Scott Danforth

    Mercruiser 5.0 TKS vs 4.3 MPI

    points ignition and carb used to be part of IC engines 101. they quit teaching that about 4 years ago. todays "ASE certified mechanics" learn less in year one than a 1985 high school kid in Autos class.
  15. Scott Danforth

    New to boating, new to Mercruiser 3.0 some questions

    the raw water pump came on the engine from GM. its a GM marine pump that fits the 153 (2.5 liter), 181 (3.0 liter) or the 250 cubic inch (4.1 liter) make sure to service your points come spring.
  16. Scott Danforth

    1997 4.3GS with Holley 4 barrel with flat spot on acceleration at 3500 rpm

    2 barrel or 4 barrel? or 2300 or 4150/4160? you payed way too much for a $35 holley rebuild kit replace with same power valve that was in there. soak the main body and the metering block(s) in carb cleaner, then chase each passage with a fine wire or fishing line, then blow out with spray can...
  17. Scott Danforth

    Anything I could do to prevent rusting of internal surfaces?

    first, you are over thinking it. no value in putting a plastic bag over the carb, the whole intake will be off to get to the heads..... drain the gas from the carb and forgetaboutit until you bolt it back on. if you wait more than 6 months, you may need to address the carb with a gasket set...
  18. Scott Danforth

    Mercruiser 470, 2 to 4 barrel carb conversion.

    the 4 barrel will give you about 15 more HP. adding a carb spacer between the 4-barrel and the manifold will help with mid-range. dropping to a 17P and letting the motor sing on the high end will help with a boat load of people
  19. Scott Danforth

    help with running surge brake lines

    its to allow you to easily bleed the system and to allow for expansion to 2 axles. if you want to skip the first Tee and plug, you can do so.
  20. Scott Danforth

    Bravo 3 Sea Water Pump - What's this?

    if there was a trophy for hypercomplexifying a cooling system, Keith and the crew at Mercruiser would win it.
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