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  1. Lou C

    4.3 mercruiser vs vortec pistons

    375-17210 Keep in mind this comes with the intake gaskets for the pre Vortec you’ll need to pick up a set of Vortec intake gaskets. I believe the head gaskets & exhaust manifold gaskets are the same for both.
  2. Lou C

    If you have a roller trailer used in salt water....check this....

    I've seen that on a few trailers (bent roller bar) over at the local marina. Not sure how it happens, other than the boat may load in such a way that too much weight is going on the front roller bars and the rear still floating? Angle of the trailer when loading? Who knows.... Yep once you see...
  3. Lou C

    Mercruiser 4.3 Alpha One problem - loses power

    Your main fuel filter is in pic #2, extreme lower right, the round housing you see there, the large water separating fuel filter should be screwed into that housing (below what you see in the pic) it is large like an oil filter. Some Mercs had the pump with the filter built in but you appear to...
  4. Lou C

    5.7 GXI-H engine. Alternator problem ?

    Isn't there also an S terminal (Voltage sense)? I know the older Volvo set ups had the Excite, Sense and Voltage output terminals, and on some the Sense was simply connected to the Voltage output terminal with a short wire.
  5. Lou C

    4.3 mercruiser vs vortec pistons

    I would see if you can get a Fel/Pro marine head gasket set for the 4.3, in the USA they are about $120 or so, the head gaskets are the same for the pre-vortec and Vortec, you would just need to get the Vortec intake gaskets those just use the best ones you can find, I don't know that any are...
  6. Lou C

    Quadrajet Secondaries Problem

    That, or a REALLY GOOD classic car restoration place or a speed shop. Here on Long Island we have SK Speed in Lindenhurst NY. https://www.skspeed.com/ When I go here to buy stuff I’m in hot rod heaven. As a kid I grew up watching street racing in Brooklyn NY everyone knew how to rejet a Holley...
  7. Lou C

    Quadrajet Secondaries Problem

    https://cliffshighperformance.com/
  8. Lou C

    Quadrajet Secondaries Problem

    The solution to the boat repair place that doesn’t want to change carb jets for an engine running at 5,000 ft altitude may be to find a shop that restores classic cars. Any one of them will be totally familiar with a Quadrajet they were on nearly everything GM made from 1966 up. Only the highest...
  9. Lou C

    Oil Analysis Poor Sample

    I think it would be ok just take a look at it make sure the clamps are tight
  10. Lou C

    1996 Four Winns Sundowner with 5.0 Cobra engine and drive

    this is the biggest problem with raw water cooled inboards, if you forget to drain it JUST ONCE, it's game over. that's why any boat I buy in the future will be 4 stroke outboard powered. We have a little Suzuki DF 2.5 for our water taxi and it is a beautiful thing, yearly maintenance is like...
  11. Lou C

    Quadrajet Secondaries Problem

    I’m thinking Sierra…so yeah Chineseum
  12. Lou C

    Quadrajet Secondaries Problem

    Ok I looked at that closely And what I noticed They show pix of every angle and where the traditional Rochester Quadrajet logo is (by the throttle linkage area), nothing! I heard that Sierra was making these some years back to the OP is it stamped Sierra anywhere? If so it’s an aftermarket copy...
  13. Lou C

    Quadrajet Secondaries Problem

    Made by who? Rochester quit making them in 1990. Mercruiser switched to the Weber 4bbl (similar to the old Carter 4bbl and Edelbrock) and OMC/Volvo went to Holley. Edelbrock did make Qjets in the '90s but none were marine units. So anybody who sold you a 'new' Qjet, either lied or sold you a...
  14. Lou C

    Quadrajet Secondaries Problem

    There is also a vacuum operated valve connected to a linkage that has to be sucked in by engine vacuum (like a choke vacuum break) for it to work. When they work, you will know it, we call that the Quadrajet Howl.
  15. Lou C

    Blue Sea dual battery troubleshooting

    Something isn't right. It seems like both batteries aren't being charged when you run the boat, which that set up should do automatically. That's supposed to be the whole point of that system, that you don't have to alternate between 2 batteries like you do with the simple 1, 2, Both and Off...
  16. Lou C

    1989 Bayliner Trophy OMC 5.8L - Help with new boat

    Do a search on my user name I have posted a few times, how to set up the Cobra shift linkage. First make sure it is full of gear oil, remove the top cap, inspect the upper gears. Then while someone else turns the driveshaft clockwise, use the shifter rod that goes into the lower gear unit, to...
  17. Lou C

    1996 Four Winns Sundowner with 5.0 Cobra engine and drive

    I highly recommend the factory shop manual, the OMC ones were very good.
  18. Lou C

    Quadrajet Secondaries Problem

    Join the forum and post your question saying it is for a marine application and what your altitude is. Someone (likely Cliff himself) will respond, he does do marine carbs. Either that, or get a new Edelbrock since Mercruisers were rigged with the very similar Weber carb so you'd be able to get...
  19. Lou C

    Quadrajet Secondaries Problem

    If you want to stick with a QJet go over to Cliffs High Performance Quaradjets, join the forum & start asking questions.
  20. Lou C

    Quadrajet Secondaries Problem

    For one let’s keep in mind that there have not been any truly new Quadrajet carbs since 1990, anything after that is remanufactured if you’re buying it from someone else and that can be a crap shoot. Good, bad, anything in between. So there’s that. I have an original QJet that I’ve rebuilt a...
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