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  1. jimmbo

    Original Holley carb on 1983 ski centurion PCM 351w ???

    It probably wasn't when it was original made. It does have the J style bowl vents, and hopefully the throttle body and throttle shafts were modified. Just one of the challenges when buying a rebuilt/remanufactured carb vs. a new carb. The OP is well aware he has no vacuum advance in his...
  2. jimmbo

    Original Holley carb on 1983 ski centurion PCM 351w ???

    My mistake, I apologize. hmm two mistakes in a 24hr period.... "the nipple runs right into the top of the carb above one of the front barrels in the carb on the same side of the carb as the secondary vacuum assembly" The hose pointed to by the red arrow looks like, it is attached to a barb/...
  3. jimmbo

    Found - Chrysler Super Bee 340ci/250hp Engine

    pic
  4. jimmbo

    5.0 to Vortec 5.7 swap

    Volvo makes a very nice 4bbl manifold for the Vortec V8. It would fit your crusier. My 5.7 Volvo came with it and used an adapter to mount a 500 cfm 2 bbl Holley. This carb is the perfect size for 305 turning 5000 rpm but falls a little short of what a 350 needs. I did buy a Holley 650 cfm...
  5. jimmbo

    Boat won't properly load onto trailer

    With some trailers, this is more than deep enough
  6. jimmbo

    Bigger motor performance estimate?

    We used to have two 14 foot car toppers, one with a 1979 25, the other a 1980 35. they went about 29 for the 25 and 32 for the 35. Our engines were crank rated, your 20 hp might be very close to our 25 in performance
  7. jimmbo

    Boat trailer needs help...boat PITA to load!

    The boat needs to be farther forward, or the trailer needs to be longer so back rollers are under the transom. the two rollers under the keel are a concern if the rear one is too high. As for difficulty loading, if you back the trailer in too deep, the boat will never center correctly. My guess...
  8. jimmbo

    Re-painting ol' scruffy - '82 90/140

    I had an 82 140 back in 1982, I remember the color looking impressive. Boat was rated for a 90, so I stuck the 140 on it.
  9. jimmbo

    Intake manifold issues

    The valve( #51) would be down stream of the exhaust manifolds. The heat riser is a passage on the bottom of the intake. Exhaust would be free to travel from one side of the engine to the other, enormous back pressure doing so. Its purpose to heat the bottom of the intake manifold beneath the carb.
  10. jimmbo

    Best Mercury Outboard Ever Made - 1984 50hp 4cyl

    I'm not going to say they are the exact same engine, I don't know if the newer 75 has the power ported pistons the 85 had. There might also be some differences in the reed valving I don't think there is a 100lb difference between the 4 cylinder and the six, unless the 4 was manual tilt and the...
  11. jimmbo

    Best props to try before dropping big $

    "Local marine shop says with my setup I can easily handle even a 28" Is he breathing thru the top of his head? Adding two inches should bring you in line with 4800. You mention tubing. A lot of people swear by the mercury High Five. Me, I swear by Mercury's Enertia, it has great acceleration...
  12. jimmbo

    1969 Evinrude 40hp Lower Unit

    In the top picture. the arrow with the circle, are there any holes there? and the arrow to the right in the picture, is that the idle relief hole? In the bottom pic I circled what at first looked like a passage, but the lighting is poor, it might just be a taper on the wall Careful with the...
  13. jimmbo

    1969 Evinrude 40hp Lower Unit

    Wow! You're learning just about everything you could ever learn about that engine design. Probably more than you wanted to know. I see you pulled the exhaust tube out. Yes clean all the carbon, it might reveal a clogged up passage. With the powerhead off you should be able to trace the path the...
  14. jimmbo

    1989 Inline 6 Mercury 115 hole by #1 plug ???? rough running problems.

    No Title You have to remove the cowl supports, then you can reposition the lower cowl
  15. jimmbo

    77 1500 new pump and impeller still overheating

    There is no poppet valve in that engine. It is a unregulated cooling system. You might have a blockage in the pipe leaving the pump, 45 seconds is a very long time for the block to fill up(pisser needs that to happen before it can pee). Here is a pic of my 1984 115 with water cover removed. Most...
  16. jimmbo

    1957 35hp Evinrude Lark Help

    On that engine the driveshaft just slides into the pinion gear. While there are 3 bearing that support the pinion, none of them run on the driveshaft itself that low in the case, so that bit of rust is of no concern. There a bushing an inch or so below the water pump seals. It looks like there...
  17. jimmbo

    About the "New and IMPROVED" vBulletin

    Any Chance of downgrading from the NEW and IMPROVED version and go back to the OLD and LOUSY version? At least it worked
  18. jimmbo

    We're does the water come out on a 1967 Johnson 100 hp (V4TL-13A)

    Re: We're does the water come out on a 1967 Johnson 100 hp (V4TL-13A) sometimes it might even look like this
  19. jimmbo

    Should I run the other way? This Volvo SX Cobra drive looks beat up

    Re: Should I run the other way? This Volvo SX Cobra drive looks beat up 18 ft boats and 3.0 litre engines are not a good match. Even a 4.3 is iffy. I have a 5.7 in my 18ft and love it
  20. jimmbo

    Evinrude Lark II 1960 elec start, elec shift

    Re: Evinrude Lark II 1960 elec start, elec shift !960 lark II
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