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  1. Scott06

    Plug gap and Compression

    As pointed out 150 is new . Usually you want to be above 125, when it gets down to 105 or so you have a dead cylinder. were these done with a hot engine? Does it run ok or are you hunting down issues ?
  2. Scott06

    Replace or Repair, where to start?

    With an r, mr , or alpha gen one drive when you split the halves of the drive you need to make sure the lower is in fwd and the shift arm in the upper is facing fwd when you out the two halves together. there is a short splined shift shaft sticking out of the lower, i think you need to turn it...
  3. Scott06

    Merc 4.3l timing question, BTDC mark

    Correct but there is on a TB5. Wasnt sure if you were just pointing out diff between 4 and 5, not sure if OP specd a year or ignition system, just wanted him to be aware of the need If he has EST or TB 5
  4. Scott06

    Merc 4.3l timing question, BTDC mark

    You re just seeing the timing light adding and removing ten degrees of advance hence why it goes to 10 BTDC with no advance in the light, and zero with ten degrees advance. mist stock balancers have only TDC and what ever base timing is. So you use an advance light to program in ‘X’ advance...
  5. Scott06

    2nd wiped Camshaft OMC 460

    yes Its possible. When you change out to positive seals you need to machine the valve guides down so the seal will fit. If you just put a seal on top of the cast in boss i would suspect you have seal to retainer interference , could be hitting the inside if the spring as you are likely using a...
  6. Scott06

    1992 Bayliner Cuddy 3.0 Mercruiser

    Dont take any bs for buying a bayliner, they are a cheap way to get on the water. Older ones didn’t hold up too well hence the chop busting. They have the same mercrusier engine as many other boats so mechanically the same. on a boat of this age you need to be concerned about wood rot in...
  7. Scott06

    Uhhhh

    Check spark strength with something like this...
  8. Scott06

    Is my 77 Inline 6, 250 CID, 165 HP a GMC or a GM Chevy

    that was the point trying to clarify info for the OP not confuse him ...he has a straight 6 not a V6
  9. Scott06

    2nd wiped Camshaft OMC 460

    Did u machine the guides on the heads for the positive seals? Sounds like you have some mix and match parts tough to tell what was done previously. if i recall on ford 429 and 460 heads the pushrod length is changed to account for any machien work like milling the heads etc? Might want to look...
  10. Scott06

    Is my 77 Inline 6, 250 CID, 165 HP a GMC or a GM Chevy

    And starting to stink...
  11. Scott06

    Mercruiser 350 and Alpha One Gen 1 - maintenance recommendations?

    Thats a good list but i would add this - Pressure test the drive. This will tell if any seals are leaking id do the plugs, check the wires, also check cap and rotor. carb rebuild id look at the fuel for any contamination if clean see how it runs, rebuild if you have stumble or other running...
  12. Scott06

    Thunderbolt IV Ignition Module

    module is in the distributor
  13. Scott06

    2nd wiped Camshaft OMC 460

    Check for adequate oil supply, use priming tool to run oil pump with valve covers and intake off. You say the lift is more - did you check for valve seal to retainer clearance? When you replaced the seals were the valve guides remachined for the seal used if a more modern positive seal was...
  14. Scott06

    1996 4.3 Mercruiser water in my oil? Hoping not!

    Looks good when is the engine coming ?
  15. Scott06

    Trouble identifying piston - OMC 5.7

    The .030 means the block was bored .030 inch overbore. Thats the common US engine rebuild over bore. look for the pistons at a US supplier like Summit Racing . What happened to the one piston? it is unusual to replace just one.
  16. Scott06

    OMC to Mercruiser!

    The only thing youd keep that isnt mercruiser specific is the longblock and intake manifold. All the other components are specific to the obsolete omc stringer set up you want to get rid of.
  17. Scott06

    OMC to Mercruiser!

    You can slap a 3.0 drive on a 5.7 but tge drive ratio is way different. The flywheel cover is tge same 3.0, 4.3, and 5.7 . issue bondo was pointing out if you get a 3.0 donor and try to piece a 5.7 in front of it you will be missing a lot of parts like exhust manifolds/wye pipe/elbows etc...
  18. Scott06

    OMC to Mercruiser!

    The stringer uses a larger transom hole than the cobra and alpha drives, you will have to fill that in so you have something to mount it to.
  19. Scott06

    Correct carb?

    Here is a link to the tuning guide. https://edelbrock-instructions-v1.s3.amazonaws.com/edelbrock/carb-tuning-guide.pdf On 5.7 you’d probably be best to go back to the factory calibration as a starting point. worked pretty good when i swaped in 5.0 in my boat. Really just needed a bigger...
  20. Scott06

    Bravo 3 Drive Showers

    Necessary no, especially for use you outline. the only time i have noticed needed one is when towing skiiers for like an hour straight, low pitch prop, glass smooth day so we had nice long runs. I was surprised how hot the upper was when climbing back in the boat. This biat was 35 yrs old when i...
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