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4.3 GL/OMC spark plug help

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  • 4.3 GL/OMC spark plug help

    Hey guys , and gals ..... noob here, hoping someone can help me out. Just had my 4.3 Volvo/OMC fully rebuilt. I’ve been searching on here and googling trying to come up with what are the correct spark plugs to put in it. Seems to be several different answers and with these answers come a lot of variables on thread depth , reach etc... just put a new distributor on yesterday which is the Delco ..... again any help would be much appreachiated
    Last edited by GA_Boater; March 5th, 2019, 04:51 PM.

  • #2
    Ngk BR6FS are the standard go to plug for most carb GM 4.3 engines.

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    • #3
      assuming your motor is a 1995 or older, the NGK's listed above
      Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

      1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

      Past Boats
      1970 Wooster Hellion - Merc 9.8
      2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
      1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

      What’s behind you doesn’t matter.Enzo Ferrari

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      • #4
        Sorry thought I included that info .... 1998

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        • #5
          1998 should be vortec heads - confirm it. vortec heads have 8 intake manifold bolts vs 12

          AC-MR43LTS or NGK BRP6EFS
          Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

          1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

          Past Boats
          1970 Wooster Hellion - Merc 9.8
          2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
          1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

          What’s behind you doesn’t matter.Enzo Ferrari

          Comment


          • #6
            Thanks Scott , yes it is the vortec heads and that’s what is confusing me. It had been running NgK BR6FS .... with just a quick glance at the 43LTS , they appear to be almost double the thread depth ... which made me a little nervous and cringe with the thoughts of turning it over after what I spent on the rebuild and hitting pistons !

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            • #7
              Guess will just have to turn over REALLY slowly
              And gapped at .040 ?

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              • #8
                Sign up today
                if your running short plugs in a vortec head, the electrode would be burried about 3/8" up the plug bore. while the motor would still run, you will be significantly down on power. if that is the case, you will also need to clean the threads

                stick your head down there, look in the plug hole with a flashlight.

                its not rocket science

                Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

                1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

                Past Boats
                1970 Wooster Hellion - Merc 9.8
                2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
                1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

                What’s behind you doesn’t matter.Enzo Ferrari

                Comment

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