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  1. Scott06

    Air Fuel Ratio Carb Tuning

    Not surprised that you have to go fatter on a smaller displacement engine. I would suspect you get less strong of a vacuum signal in the booster and pull less fuel. Mich motorz 1409 on the 4.3 , 5.0, and 5.7 partial engines. the air flap ( maybe not officially eddy Terminology) allows the carb...
  2. Scott06

    Air Fuel Ratio Carb Tuning

    On my gto i used a clamp on bung that goes over the exhaust pipe, but they were rusty pos pipes nit what u have but it would save you pulling it to weld in a bung. Needs to be upstream of water dump in…
  3. Scott06

    5.7L rebuild and upgrade to vortec heads

    Do an oil analysis as suggested . Blackstone labs was like $40. Do a compression and or leakdown test. If cared fir you should be fine, if not cared fir u know what you’re dealing with
  4. Scott06

    Air Fuel Ratio Carb Tuning

    This is the sensor plate goes between manifold and elbow, you need 4 x longer bolts (6.75" long), plus a sensor of your choice sensor plate- https://www.michiganmotorz.com/o2-spacer-stock-mercury-riser-wet-joint Sensor Kit -...
  5. Scott06

    Prop hitting anode

    I also think the TP 4 blade props used two different blade designs on the same prop. SO maybe OP has a 4 blade. OP hasnt been back so looks like we are more interested than he/she is
  6. Scott06

    Air Fuel Ratio Carb Tuning

    Out of the box aka stock 1409 has the following: .098 primary jets, .068 x .047 step up rods with orange (5" vacuum) springs, .101 secondary jets. I landed on : Stock jets (.098/.101) .065 x.042 metering rods (1 step richer both cruise and power) Pink step up springs (7" vac) .033" accelerator...
  7. Scott06

    Does 1988 bayliner have a kill switch?

    It would be on your shifter- My 1990 sea ray did not have one. Do you have 12 v to positive side of coil when key is in run? If you have point it will be more like 9 v as it will use a resistor to make points live longer. If you do have points when was last time they were serviced?
  8. Scott06

    Air Fuel Ratio Carb Tuning

    So I was able to get this installed a few weeks ago and try things out. Only install issues I had was needing 1" longer bolts for the elbow as this 1" plate was sandwiched in...(stock is 5.75" long needed a 7" and trimmed off 1/4"), and the o2 sensor sits so close to the top of the manifold I...
  9. Scott06

    New to me Livingston not performing at its best

    You are low on rpm so need to go down in pitch like a 9" pitch should get you another 400 or so rpm which is still kind of low. If they make a 7" pitch do that as it should raise you 800 rpm vs the 11" Yes it is common that manufactures use the same power head with smaller carb or restrictor...
  10. Scott06

    5.7 Vortec Runs Great On Land but Bogs Under Load in Water

    Yeah not 100 % sure edlebrock calls it a step up piston. Power piston may be a hold over from my rochester 2 jet/ mercarb days … either way we are talking about the same thing.
  11. Scott06

    5.7 Vortec Runs Great On Land but Bogs Under Load in Water

    I noticed on my vortec that the electrode discoloration is not consistent around the entire electrode, which is kind of what i see here . I get more of a brownish, and im running a tad on rich side (13.25-13.5 afr at cruise , 12.0-12.5 at wot)
  12. Scott06

    Help me identify this part & our issue

    Here is a parts breakdown, https://www.marineengine.com/parts/mercruiser-sterndrive-parts/30l-mpi-ec/1a072812-up/cylinder-head-and-rocker-cover Looks like it is a vent to the manifold - sucks blow by into intake. Entirely possible if this is popping out it is creating a vacuum leak that lets...
  13. Scott06

    Bellows ?

    I think its more personal preference, I have no personal experience using the tube but I could see on plane and trimmed up it making more noise, probably depends on what engine how you trim it etc. I can say this my boat with torn exhaust bellows was no louder than non torn so I can't see it...
  14. Scott06

    1996 Bravo 3 Aluminum ring for u-joint bellows

    It is what holds/seals the bellows to the bellhousing so yes it is quite necessary. Merc makes a tool to install it , and most folks use merc power tune sprayed on it to make it slick as 'ell. I used a storm water grate piece (fits in a female pipe fitting) pushing it with a 5 lb mallet (BFH)...
  15. Scott06

    Bellows ?

    Some folks swear by the tube due to ease of installing. I did not find the exhaust bellows too difficult to install if you have the expander tool
  16. Scott06

    Mc-1 upgrade....

    R, MR, or alpha gen one will do that
  17. Scott06

    Found piece of metal in exhaust outlet

    It was his brother 30 pack jack
  18. Scott06

    Engine Bogging Down When Cold

    Boat might be a little big for a pool but at least we can have cocktails
  19. Scott06

    5.7gi reman shutting off on test stand

    Use a timing light
  20. Scott06

    Engine Bogging Down When Cold

    Rotor comes with the cap, the separate rotor is not for your distributor Its for a delco EST.
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