L18 8.1L swap resource thread

Discussion in 'The Engine Bay' started by Larry, Jun 14, 2013.

  1. Capt Ron

    Capt Ron Minus .7 liters Premium Member GMOTM Winner

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    This does stick out farther than I realized. Shown with a used gasket.
    Hey @Larry while we are on the subject, throw the end gaskets in the trash and use
    The Right Stuff like older Chevys?

    20200102_160732.jpg
     
    Last edited: Jan 2, 2020
  2. rksjd8420

    rksjd8420 1/2 ton status Premium Member

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    So what needs to be done to the engines that had the oil consumption problem? I bought one a while back that was pulled out at 3000 miles and has set in storage ever since. I think it is a 2003 model.
     
  3. Larry

    Larry 1/2 ton status Premium Member GMOTM Winner Author

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    I’ve never really looked at them at that angle. I’d say as long as the head has an opening for that chunk to fit in to you’d be fine. Actually, I do use the end gaskets on L29s and 8.1L’s as the new style intake gaskets are so much better than the old school ones but I do use GM 12378521 RTV in the corners. RightStuff should work fine too, its just a sumbish to get off later.
    [​IMG]



    Keep putting oil it it :dunno:. Plan on adding quart every 1000 miles as that is what the service manual spec is for the 8.1. Most exceed that some don’t. My bone stock 8.1L in my 2001 Silverado has used a quart of oil every 1,200 miles like clock-work from the day I drove it off the lot when it was brand new. It had those oil consumption bulletin fixes done while in warranty and did not change anything. On the other hand, the 8.1L in my K10 burns a qt about every 2K and the Suburban doesn’t use any between oil changes but it is the newest model year engine of all of them (2008). Some people on the various 8.1L Facebook group claim they have added an oil catch and created a true PCV system and helped with oil consumption. I’m not interested in following some of those guys barnyard "fixes" so I just keep oil handy
     
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  4. rksjd8420

    rksjd8420 1/2 ton status Premium Member

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    Thanks. That was my plan. I haven't seen anything that made much sense on GM's recommended "fixes". I trust your advise more than GM's.
     
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  5. Russell

    Russell LLY Escalade Status Premium Member GMOTM Winner

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    Received my order with the water pump bolts in it - No joy. Those bolts are too short. I'll probably just measure the one that fits and order a standard bolt the same size. There is no listing for water pump bolts anywhere online. I suppose I could try my local dealership, but they are usually super expensive and won't give out part numbers.
     
  6. Larry

    Larry 1/2 ton status Premium Member GMOTM Winner Author

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    Here are the water pump bolt choices. Its basically two part numbers on this list, which the last bolt part number came from the Workhorse EPC. 11516361 or 11516109

    [​IMG]

    [​IMG]
     
    Last edited: Jan 20, 2020
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  7. Russell

    Russell LLY Escalade Status Premium Member GMOTM Winner

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    Perfect! I'll do some measuring and re order based on that chart
     
  8. RootBreaker

    RootBreaker 3/4 ton status Premium Member GMOTM Winner

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  9. sweetk30

    sweetk30 5/8 ton status . . . just for BENT77 Premium Member

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    that looks like for 96-02ish vortec L31 sbc vortec stuff .
     
  10. Larry

    Larry 1/2 ton status Premium Member GMOTM Winner Author

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    If you have a pickup truck bracket with A/C on the passenger’s side all you need to do is remove the compressor and belt just like an LS engine (the compressor runs on its own belt). That’s it! Ez peezy....nothing to buy
    [​IMG]


    Now if you had a Workhorse/G-van/Medium Duty type bracket and wanted to delete A/C, just add an idler and shorter belt
    [​IMG]
     
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  11. RootBreaker

    RootBreaker 3/4 ton status Premium Member GMOTM Winner

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    out of a 2001 Silverado 3500...
     
  12. Larry

    Larry 1/2 ton status Premium Member GMOTM Winner Author

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    Well, there you have it... you're in luck as there is nothing to buy, just stuff to remove :waytogo:
     
  13. imiceman44

    imiceman44 Hoarder extraordinaire Premium Member

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    Well other than a new shorter belt.
     
  14. Larry

    Larry 1/2 ton status Premium Member GMOTM Winner Author

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    No, not on truck brackets as the A/C compressor runs it's own tiny belt just like an LS engine
     
  15. imiceman44

    imiceman44 Hoarder extraordinaire Premium Member

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    Oh I see.
     
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  16. Larry

    Larry 1/2 ton status Premium Member GMOTM Winner Author

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    :waytogo:
     
  17. Blue85

    Blue85 Troll Premium Member

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    Anyone have dimensions of the oil pan such that I could build a wooden holder for transport?
     
  18. Blue85

    Blue85 Troll Premium Member

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    Using a tire, some blocks of wood under the crank pulley and some ratchet straps. So I'm joining your club.

    20200215_142829.jpg
     
  19. #Burbslut

    #Burbslut Registered Member Premium Member

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    I have to say, what a amazing thread this is.

    After going back and forth on what I was going to do to my 87 6.2/400/208 V20 Burb. I made a decision and joined the 8.1 club in November. Since then, I have been amassing parts and collecting as much info as I can. I’m not sure if there hasn’t been a question that popped up in my head that hasn’t been answered here.

    I actually wasn’t even considering a 8.1 until I reached out to a friend that owns a fab and motor company in Gilroy Ca. I had picked up a 6.0 ls and was on the hunt for some good used parts. After a few conversations and months of hustling, I picked up my Tilden Motorsports 8.1!

    I originally was going to put a tbi454 in, then a 6.0 ls. But I really wanted the BBC. I got the best of both worlds.

    42A0CC87-655C-4E57-A04F-04E5AA5B126B.jpeg
     
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  20. Blue85

    Blue85 Troll Premium Member

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    Anybody have a good site to look up exploded diagrams and part numbers?

    Right now I'm looking for the gaskets that go at the ends of the giant iron coolant crossover tube and can't find them listed anywhere.
     

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