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  1. Scott06

    Merc/GM 4.3 tops out at 4000 rpm

    Plugs look a tad rich found this compression test compensator https://sovietsteeds.com/forums/viewtopic.php?t=48747 says at 6 k your readings will be 16% lower , but that only brings the low cylinders up 110 psi at sea level… which is low. With a fresh engine i would expect them tighter and...
  2. Scott06

    2004 4.3L Merc Alpha Starts But Stalls Out

    Start with emptying the fuel filter look at contents for anything but fresh clean gas. take off the flam arrestor pump the throttle and see if two good strong streams of gas shoot out of accelerator pump nozzles. tach jumping could be a failed tach that is shorting the ignitron system would...
  3. Scott06

    Volvo penta 5.0l wont run with water

    Did you check the fuel filter ? That will be a good indication if there is water or debris in the fuel. Also in additon to tests recommended above would check the plugs see what they look like and check cap and rotor. I suspect you need some basic maintenance items Dealt with.
  4. Scott06

    Bayliner 305/350 swap

    only the gear ratio in the drive as mentioned. Generally the 350 would use 1.47 ratio drive and the 5.0 a 1.62 ratio. The 350 will make more power, if it was propped correctly so it was towards the top end of WOT rpm range you will need more pitch or swap the drive. When I repowered a 4.3...
  5. Scott06

    Filling coolant reservoir 3.0 TKS?

    Never had an issue using the "for all makes and model" kind in any of the used cars I've bought, some that had browish AF where someone obviously screwed up what they were putting in. Not saying this is the best solution but to get him to the point where he can haul it and change it it will work
  6. Scott06

    Filling coolant reservoir 3.0 TKS?

    My advice top it with the premixed ‘use with any kind of antifreeze’ antifreeze.. At end of season drain flush and refill new
  7. Scott06

    Pic of Milkshake spew all over my engine. Help please

    I had heard the same from Michigan Motorz when I did my repower. I saw this plug being discussed on here and asked them if I needed to do the same to the 5.0 I just bought from them, they said no only on the 4.3 didn't give a reason ... To the OP you can rig up a pressure test for the cooling...
  8. Scott06

    Thunderbolt IV issue?

    Tach is driven off negative side of coil so that would make one think yes it is ignition related. Wouldn't hurt to measure fuel pressure as a sanity check as a plugged fuel tank vent can take run time before it occurs. If you disconnected the tach at the coil and it made no difference. Try...
  9. Scott06

    How long should a new engine be run before the first oil change?

    may be overkill but i changed mine after one hour then ten, annually thereafter. Used rotella for break In.
  10. Scott06

    Stalls on acceleration under load

    Need a t fitting and a fuel pressure gauge generally can rig something out of 3/8 flare fittings with a little creativity What do the spark plugs look like
  11. Scott06

    Stalls on acceleration under load

    If fuel pressure is ok then likely needs carb cleaning and rebuild
  12. Scott06

    1980/90 mercruiser 3.0 140 hp /water in oil/ explosion sound💥

    Valves are staying open in cylinders 2&3 explosion is backfire or exhaust valve is open when the cylinder fires. Likely the water in the engine means the parts of the engine are rusted like valves Tear the engine down or at least take the head off and see what you have but if you had water in...
  13. Scott06

    1400hrs 5.7l 2001

    Should be willing to do a compression and or leak down test on it. If compression is ok and it has 10 psi /. 1000 rpm of oil pressure hot you ar good to go. would look at condtion of exhaust manifolds especially if in salt water, as Bondo stated lack of maintenance is biggest killer…
  14. Scott06

    Bayliner 305/350 swap

    Take the 350 out of the suburban put marine head gaskets in and brass core plugs. Might need to swap the cam might not. Typically truck cams and marine cams are interchangeable in terms of use. Marine needs idle to 5k power range… basically strip it to thr long block and swap your marine...
  15. Scott06

    Pic of Milkshake spew all over my engine. Help please

    Entirely possible the water cross over inintake cracked. I believe there is a drain plug in it that can get missed
  16. Scott06

    3.0 Mercruiser Choking

    In addition since it takes run time for problem to crop up maybe fuel tank vent is clogged putting tank under vacuum try opening the gas cap when it happens see if it makes a difference
  17. Scott06

    Happiest Day of Ownership !!!

    Looks great especially the interior
  18. Scott06

    Front engine mount wont go low enough to align gimbal bearing

    Did u center the gimbal bearing by inserting alignment tool and smacking it up, down left and right? Would be concern that you may have a bad transom
  19. Scott06

    port side exhaust elbow over heating.

    If I continue to have issues have heard short life of SEI impellers might be worth swapping impeller for oem merc impeller which will hold up very well
  20. Scott06

    HT383 crate engine?

    Stock marine 5.0 and 5.7 are 9.4:1 so dont see an issue with 87 and 9.4 CR
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