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  1. 2550SX

    Need advice choosing an engine.

    I appreciate the replies.
  2. 2550SX

    Need advice choosing an engine.

    Hello, I have a 1992 Chaparral 2550XS with a base 330hp 454 with the peanut port heads. The engine has about 1400 hours on it and I can still get to 51mph on the GPS. According to the specs I can find online my boat weighs 5100lbs dry. I am considering pulling the engine to do some other...
  3. 2550SX

    Would a bad coupler make a noise like this?

    Thanks. I am ashamed to say i havent pulled the drive yet. I keep it on a trailer at the marina an hour from my home and i signed a waiver that i am not supposed to wrench on it at the marina even though we all do small stuff. Pulling a drive may raise some eyebrows. Ill probably bring it...
  4. 2550SX

    Would a bad coupler make a noise like this?

    It sure is, i had to replace that $800 wonderful piece of engineering last year. I change the oil in it annually
  5. 2550SX

    Would a bad coupler make a noise like this?

    I bought it in the spring of 2021 and paid a marina to replace the bellows that same spring. While they were in there I asked them to check the allignment, U-joints and gimbal bearing. Grease as necessary and change the oil in the drive. They gave it a clean bill of health. I have only put...
  6. 2550SX

    Would a bad coupler make a noise like this?

    Hello all, I noticed this noise the other day coming from the coupler / gimbal bearing area of my boat. I hear the flappers ticking but there seems to be sort of a faint knocking also. The boat is a 1992 with 1400 hours on the original 7.4 / Bravo1 I see zerks on the coupler and I did give...
  7. 2550SX

    Buying a automotive engine to replace my mercruiser, need opinions

    Good info here. So far I only have the cam specs listed in my first post from the GM Performance site. I don't think I would get a cam card unless it came with the engine if and when I purchase it. Let me ask you this. What marine cam would you recommend for a 502 in a 5000lbs cuddy with a...
  8. 2550SX

    Buying a automotive engine to replace my mercruiser, need opinions

    What is different about the circulation pump that comes with the engine vs. a marine circulation pump? Stainless components? Here is the dyno graph for this 502
  9. 2550SX

    Buying a automotive engine to replace my mercruiser, need opinions

    I have an older 25' cuddy which has the original 330hp 454 from 1992. She still gets up and goes and seems to have decent compression with minimal oil consumption but I was considering pulling the motor this winter and stroking it to 496 and throwing some better heads on it than the current...
  10. 2550SX

    Fluid Changes for Winterizing, Do I Need to?

    I have a 2002 Chevy 2500 silverado with the 8.1 and I bought it new. I dont drive it every day but I I do drive it a lot. I managed to put 168,XXX miles in it so far and it seems to run fine. I don't change the oil every night. Which means it has had acid in the oil for 19 years now. I do...
  11. 2550SX

    Winterizing question

    you are probably right. I disconnected the hose from the pump and drained it. Why rear bench seats are not removable is beyond me.
  12. 2550SX

    Winterizing question

    1992 Chaparral 454 with a Bravo 1. I bought the boat 3 years ago and the previous 2 years I would begin winterizing by remove the drain plugs from the block and manifolds. Once the water stopped dripping I would Install the drain plugs and pull the water inlet hose off of the thermostat housing...
  13. 2550SX

    surging after carb rebuild

    Years ago I rebuilt a rochester on my 1986 silverado and once i got it adjusted it was running fine and then one day not too long after I did the rebuild I was driving home from work it started surging on the highway. I recall trying a few different things but what ultimately fixed it was me...
  14. 2550SX

    Thru hull exhaust

    Is that a real picture?
  15. 2550SX

    Thru hull exhaust

    23" sounds about right. a 27" prop will bring those RPM's down a lot and make the boat harder to get up on plane.
  16. 2550SX

    Pop during final torque of head

    I could see how if you did not use a lubricant under the head of the bolt it could make a little pop noise from the friction created but if you did indeed lube them there should be no friction. I cant see a head bolt snapping at only 93 ft/lbs though. I would leave it. If it really bothers...
  17. 2550SX

    Pop during final torque of head

    Did you put a drop of oil under the head of the bolt prior to tightening them?
  18. 2550SX

    Thru hull exhaust

    Chevelle or corvette. No camaro.
  19. 2550SX

    Thru hull exhaust

    What RPM is that engine spinning at 65mph?
  20. 2550SX

    Thru hull exhaust

    Mercs are chevys. Did you mean the engine was swapped from a small block merc to a big block merc? Maybe you can get creative with some 45's like these...
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