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  1. Scott06

    1990 Sea Ray 160, Mercruiser 3.0 with Alpha one gen 1

    Yes early 70 s was 140 hp Rating . My 1991 boat(1990 engine build date)lx was 135 hp not sure if the diff was prop vs flywheel that the 140 was. There was no 2.5 in 1990 ( per Don S last year was 89) the 115 or 120 hp 3.0 ( non lx ) i belive had the 3.0 block with the smaller port older design...
  2. Scott06

    Mercruiser B4S Conversion

    I would love to try it just cant afford the buy in. Neighbors at the lake have a 24 ft mastercraft, beautiful boat but outta my league $ wise ive had fun with my kids and their friends wake boarding, which for a 50 yr old guy is painful. Added a tower, which helps to pull up large mamals, but...
  3. Scott06

    1990 Sea Ray 160, Mercruiser 3.0 with Alpha one gen 1

    Agreed my sea ray was a 170 i think (1991) i ran both a 3 blade 17” black max and the 4 blade 16” voretx, cannot imagine going lower in pitch as either of those loaded would hit 4800 easily . there were a couple different 3.0 s offered i think one at 115 hp and the lx at 135 Hp…
  4. Scott06

    Mercruiser 4.3 removing oil from bores?

    That is too fancy I just twisted them together. Either way throw the leads in your tool box on the boat if you ever have an issue out on the water with key or dash you can hot wire it...
  5. Scott06

    1990 Sea Ray 160, Mercruiser 3.0 with Alpha one gen 1

    I had the exact same boat for 20 years. Year 21" is too much pitch for your engine I used a 18" 4 blade michigan wheel votex for tubing/cruising I used a 16" 4 blade michigan wheel vortex for skiing Both worked very well and were relatively inexpensive being aluminum Also make sure you...
  6. Scott06

    Connecting a electric fuel pump to 5.7LX

    No I'm thinking of the mercruiser wiring diagram a posted and how it powers an electric fuel pump …
  7. Scott06

    Mercruiser 4.3 removing oil from bores?

    5/6/7 are the wires . 6 red purple is 12 v + to dash 5 purple is ignition 7 yellow /red is to engage starter solenoid and thus starter i took two pieces of 14 gauge stranded wire , twisted two ends together and put them in 6. Stick one of the other ends in 5 for maintained power to ignition...
  8. Scott06

    Connecting a electric fuel pump to 5.7LX

    No the purple wire doesnt have power until the key is released from start into run position. Old motor was a mechanical pump right? merc did essentially have a second switch, the key triggering the starter…which powers the pump during cranking.
  9. Scott06

    Mercruiser B4S Conversion

    has the forward facing dual props so you can safely wake surf behind it . Like the VP forward drive it is a way for stern drives to get into the wake boat market that until now has been the realm of really expensive V drive boats ...
  10. Scott06

    Carb choice.

    I knew you would say that. bottom line when properly rebuilt, set up and maintained qjets, AFB/webber/Edelebrocks, and Holleys all work very well. Key is getting decent core carbs and having the knowledge and experience to make it work. When you hear comments otherwise one of these is lacking...
  11. Scott06

    Missing drive oil bottle ???

    I don't think they take the project boats... only the shinny ones.
  12. Scott06

    Connecting a electric fuel pump to 5.7LX

    If you only use the purple ignition wire the fuel pump will not be powered during cranking. So when your fuel bowl dries out as typical when the boat sits for a couple weeks it will never refill and engine wont start. two ways around it - wire in parallel a momentary switch to prime before...
  13. Scott06

    Missing drive oil bottle ???

    On the older Gen ones without one it wasn't much of an issue, especially if it is a trailer or lift kept boat. I would just check the level up top and bottom for any water or metal a couple times during the season.
  14. Scott06

    Connecting a electric fuel pump to 5.7LX

    This is what you want to wire. You may be able to get it off the yellow red which fires the starter, if you cant get it off the starter. you starter has three lugs on it though? Need to get 12v off starter during cranking then go through the switch off the purple ignition wire when in run . Yes...
  15. Scott06

    Carburetor choke question

    Yep ran many years like this just zip tied the choke open couple of pumps and good to go… mostly warm when boating
  16. Scott06

    Missing drive oil bottle ???

    Spoken like a true professional….
  17. Scott06

    Missing drive oil bottle ???

    Photos 1&2 have a q jet, photos 3&4 have and edlebrock ….
  18. Scott06

    got a question about a future V6 to V8 repower...

    The 5.7 is the way to go. Hp diff between a vortec 4.3 and 5.7 is 225 vs 295, torque diff is 268 lb ft vs 370…and the torque curve for a 5.7 is flat http://marinepowerusa.com/wp-content/uploads/2019/08/57lspecs.pdf if you are running a 17 now you d probably need a 21 with a 5.7
  19. Scott06

    got a question about a future V6 to V8 repower...

    I did a 4.3 to 5.0 swap a few years ago in a Sea Ray 200 sport. If your engine compartment and stringers are set up for a V8 then it is pretty easy. I got a partial engine package from Michigan Motorz plus exhaust manifolds. Since the 4.3 and 5.7 are essential the same block minus two cylinders...
  20. Scott06

    Carb choice.

    https://cliffshighperformance.com/simplemachinesforum/index.php?topic=3979.0 talks a bit about casting numbers and cfm
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