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  1. AKJohne

    5.7 LX starter

    1996/97 5.7 LX 0K158784 recently replaced the old motor with a new long block. Starts, runs, however the starter is noisy, I would not call it a grinding noise. I know SBC's often require shimming the starter, which we did not do. I will investigate further this weekend, I just thought I would...
  2. AKJohne

    Connecting a electric fuel pump to 5.7LX

    1997 5.7 LX Alpha 1 Gen 2 Looking for advice on connecting power to a electric fuel pump. I am in the process of replacing the old motor with a new long block. Bought the motor and electric fuel pump "kit" from Michigan Motorz which included a NC oil pressure switch. The wiring diagram MM...
  3. AKJohne

    Bought a new long block and wondering about the coupling and gimbal bearing.

    I know, I know... I only get on here when I need help and am thankful you guy's are here. I am working on a 1997 5.7 LX Alpha 1 Gen II. The existing motor was pre-vortec and rebuilt by others, I tuliped a valve last year and had the heads rebuilt. After I got it back together I realized it was...
  4. AKJohne

    5.7LX rebuild question

    1996/97 5.7LX A1 gen 2, closed cooling 0K158784 Severe blow by and time to to rebuild. ~ 580 hours on a rebuild (PO), not original block. Had head issues last season and tuliped a valve, replaced all the intake valves. Compression and leak down test were ok and piston (#3) looked ok. Not...
  5. AKJohne

    1997 5.7 LX knock sensor

    Recently rebuilt the heads due to a tuliped intake valve, all back together and was verifying the knock sensor was functioning. Used a timing light and had the motor warm and running at ~ 1800 RPMS on the muffs. One guy watching the light and tapped on the block, sure enough you could see it...
  6. AKJohne

    Burned valve or worse 1997 5.7 LX

    0K158784 Alpha I ~ 570 hours on rebuild (not by me) Saturday we were wrapping up a week long trip and had good weather, running From Unakwik to Naked Island, about 25 miles, we had good water and was running hard, ~ 3800-3950 RPMS. Typically run 3200 to 3600 sometimes 3800, have recently seen...
  7. AKJohne

    New elbows on a 5.7 LX.

    1996 5.7 LX, Last week I made a trip to Homer for some king fishing. On startup i discovered the port side elbow had cracked directly under tne drain i forgot to open before i parked it outside in below freezing temperatures. Fortunately I was able to get a brand new OEM elbow from the local...
  8. AKJohne

    Exhaust Bellows, Alpha 1 Gen 2

    Last year I had the drive off and resealed the gearcase/s, replaced all the bellow's and hoses (OEM). While doing some maintenance I noticed the exhaust bellows has come loose from the outdrive. I have read enough to believe the exhaust tube is a acceptable alternative. I have a large platform...
  9. AKJohne

    24' Glasply, Aluminum or Stainless.....?

    I have been running a aluminum 15.25 X 15P on this boat its done ok, but has acquired some dings and thinking about replacing and or upgrading. 24' boat 20 degree deadrise, 7-8K loaded, 5.7 LX, 1.47 Alpha 1 gen 2. Typical cruise at 3200 is 24-28 MPH, WOT is 4600 and ~ 38 MPH. none of these...
  10. AKJohne

    Fuel burn with 5.7 LX mercruiser, 24' Boat

    In 2018 I and a buddy finished a rebuild on a 1982 24' Glasply, works great and having fun with it, have managed to put on 400+ hours in 2 seasons between the two of us. 1997 5.7 LX 4 bbl. AI GEN II I had to have some work done on the outdrive this winter and all is working now, It looked great...
  11. AKJohne

    Dreaming about a spare motor

    I have a 24' glass boat with a 1997 5.7 LX, Alpha 1 G2. The boat is heavy but it runs good and we can typically cruise around 22 to 25 knots at 3100-3300 RPM. 2.1 MPG. 4600 WOT. Motor has 300+ hours and runs fine, however it is a rebuilt motor and I just dont really know what to expect for a...
  12. AKJohne

    Need some help with a cooling hose

    96/97 5.7 LX 0k158784 closed cooling I want to replace the cooling hose for the water pump to the heat exchanger, having a hard time identifying the hose online. No local dealer) I bought a sierra 1871337 thinking I just needed to trim the end... dont look right, can anyone help with the...
  13. AKJohne

    97 5.7 LX, A 2 GEN 2 drive questions

    Several questions; Replacing the water pump on the motor (FWC), what type of sealant should I use on the gasket/s? I am resealing the lower unit and cannot remove the seal carrier (input shaft) as described in the book, do they normally come off unscathed or is just a matter of sacrificing the...
  14. AKJohne

    1997 5.7 LX leak down test

    I am concerned about the results of a cylinder leak down test I did today, ~ 172 hours on a rebuilt (others) motor. Engine has closed cooling. Test was performed with engine hot ~ 140F and cylinder PSI at 100 #1) 84 #3) 93 #5) 92 #7) 76 #2) 90 #4) 88 #6) 80 #8) 84 All leakage that I can...
  15. AKJohne

    Mannies & Risers, reuse or replace

    1997 5.7 LX, San Juan HE, closed cooling, This motor was originally in a Alumaweld, now in a Glasply. 200 hours freshwater, 140 hours in saltwater. After several years of work we finally launched this spring. I had removed the riser/elbows, cleaned and installed with new gaskets. We had to...
  16. AKJohne

    How far can you advance a Thunderbolt V...?

    1997 5.7 LX, 4 brl carb. Thunderbolt V w/ knock sensor According to the book base timing on this motor is 10 degrees. I am not sure what ICM/module I have (its original), I am wondering what happens if I "cheat" base timing to get more TA? Assuming the knock sensor/module is working properly...
  17. AKJohne

    Neutral safety switch on 5.7 LX

    I have a 1996/97 5.7 LX with AI GENII. I bought this package used to install in a Glasply I have been redoing. I could use some help sorting out a neutral safety switch, the prior boat that this motor came out of had a single handle binnacle. I will be using a sea dog 2 handle binnacle that...
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