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  1. Scott06

    1990 5.7. 260 Overcooling at idle.

    Make sure you get the spacer for the thermostat. Ive never been able to get one out without destroying it
  2. Scott06

    1990 5.7. 260 Overcooling at idle.

    I believe on a cold manifold set up you needs 4 open holes not the restrictor @achris will probably know
  3. Scott06

    Engine rpm is not stable below 2000 rpm

    https://static.speedwaymotors.com/pdf/325-1403.pdf this is the tuning guide. Look up the page for 1409 although not sure what jets yours came with fir the 4.3 calibration the graph shows how to make different phases of operation richer or leaner. Process of making a change reading the plugs...
  4. Scott06

    1990 5.7. 260 Overcooling at idle.

    Dont know your housing mine is a 6 port that can cause issues if the restrictors that feed raw water to the elbows hang up, but that causes overheating not over cooling so i think youre on the right path with the thermostat
  5. Scott06

    1990 5.7. 260 Overcooling at idle.

    Have you tried replacing the 140 thermostat in there? Seems like it is not fully closing. in fresh that isn’t too heavy in minerals you can runa 160 but i think yours is not closing or has debris stuck in ti
  6. Scott06

    Engine rpm is not stable below 2000 rpm

    Probably lean on the idle transition circuit. Back out the idle mix screw a half turn see if it improves. I think several folks here did not like the edlebrock 4.3 calibrations @Rick Stephens rick may be able to point you to correct calibration, but generally the main venturis take over about...
  7. Scott06

    OK Merc guys got a question about using a 140* stat...

    Thats consitent with what I see on the hose takes a long time to get hot especially in the spring when water is cold
  8. Scott06

    Carbed Mercruiser 260 5.7L Missing Above 4000 RPMs

    No need for a new carb just clean and rebuild yours. places like mikes carb parts have rebuild kits (gaskets needle seat and accelerator pump). If this carb only worked 3-4 times then had issues you have fuel system contamination , buy a new carb and its passages will be plugged soon too. Need...
  9. Scott06

    Carbed Mercruiser 260 5.7L Missing Above 4000 RPMs

    Heres a tuning guide that shows the theory of operations. Yes siphoned through the jets and out the venturis primary during low speed and as rpm increases as airflow requires the secondaries start to get airflow the sediment you see is probably clogging and causing some of your issues...
  10. Scott06

    1992 Mercruiser 4.3 w/ balance shaft and 1 piece rear main seal swap to newer year Vortec.

    Yeah based on that info if your engine compartment and stringers are set up for a 5.7 go that route. You will not regret doing that.
  11. Scott06

    Overhauling my 1988 Alpha One Drive Train

    No what hardware are you missing ? Its a 1/2” x20 bolt that goes in there so its a clearance hole for that size
  12. Scott06

    2012 Starcraft Limited 2000 I/O Question

    Willing to bet if it is a carburated 190 hp you have a 1.81 drive, if you have an mpi a 1.62 drive but chris is right before you go prop buying whats your current prop design (aluminum or stainless 3 or 4 blade) and pitch plus current wot rpm. Are you looking for a replacement or to solve an...
  13. Scott06

    2000 Searay vapor lock

    What the guys are looking for is an engine serial number or is the engine carb, efi, or mpi the answer you get will depend on what fuel system you have
  14. Scott06

    2016 4.5L mercruiser i/o Very weak performance

    What is current prop a 3 blade aluminum? Agreed staying with a 19” three blade or a 18” 4 blade like this if you want more hoelshot or focus on water sports http://boatpropellers.iboats.com/Michigan_Wheel-Vortex_XHS-Propellers/992203/?cart_id=252814407
  15. Scott06

    Flame Arrestor w/Fuel Vent Connection

    Bout halfway down this page shows the location of the overflow tube on a marine 4160 https://marinecarburetor.com/Y41-4160MercruiserOMCVolvoPenta.htm
  16. Scott06

    Flame Arrestor w/Fuel Vent Connection

    Normally the fuel pump vent line goes on a barb on the carb around the airhorn Not on the flame arrestor If your carb doesnt have a barb it is possible that some one swapped in a non marine carb which is hazzardous. Do you have a pic the your carb without the flame arrestor on it
  17. Scott06

    1992 Mercruiser 4.3 w/ balance shaft and 1 piece rear main seal swap to newer year Vortec.

    As others have said the 5.7 swap is very doable if you have 5” additional space in front of the engine. and the side motor mounts move forward bout 4.5” I did a 4.3 5.0 swap. Took all accessories over wiring harness etc used a partial engine package from michigan motorz and added exhaust...
  18. Scott06

    Power steering fluid leak

    Had the same thing on my neighbors volvo 4.3 last summer couldnt find the PS leak every hose clamp on that engine was loose.
  19. Scott06

    Engine struggles to turn over

    Great
  20. Scott06

    Mercruiser 4.3 cracked intake manifold

    I believe michigan motorz sells that intake
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