Oh, noes! I am considering it... LS Swap?

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    Oh, noes! I am considering it... LS Swap?

    Yeah, later this week, when I have time, I am going to compression test my TBI 454. I think its done (chasing oil leak that really seems to be drive pressure getting into the crankcase and pushing oil out). I don't have the time or inclination right now to rebuild it, and buying short or long block for this thing is stupid money for zero gain. Then I thought, WTF not just give in and find a 6.0 to swap?

    So who here has done it? What is the best route? Find a rusty 2500/3500 express van with the engine and computer for cheap? What would I need to change, electronically, for a 1994 4L80e to talk to the computer on an LS? What surprises will I run into along the way? Is there a recommended swap harness to be as close to plug-and-play as possible?

    I mean, 323/373 with the ability to get a lot more with a basic tune and dropping torque management is probably going to be better off than 255/405 from the TBI that can't go anywhere further when towing a couple FJ60/62s, right?

    Anyway, what's the skinny? Depending upon the donor's price, what other costs am I facing, and what do they currently run? Say a total if I found a 2002-2004 Savana/Express 2500/3500 6.0 that was rusted out for under $1k.

    A good long block TBI 454 will run me about $3600... think I could swap for cheaper while tuning for higher torque than the current 405?
    Mrs CSR said I was good, or something.

    #2
    8.1?

    Comment


      #3
      Originally posted by YotaAtieToo View Post
      8.1?
      I would love that, but the donors are more difficult to find and demand a lot more money.

      Basically, if it will cost me about $4500, all-in, to go with a stock replacement reman engine, that's about the max I would want to spend on a swap.
      Mrs CSR said I was good, or something.

      Comment


        #4
        Originally posted by YotaAtieToo View Post
        8.1?
        This.

        While the 6.0 will have more horsetorques than the gofitty4, its still a high strung engine. I'd have something deeper than 3.73s for towing.

        considering the 6.0 came with a 4l80e, I'd look into VB differences. should be plug and play if you get the entire donor.

        Originally posted by DRTDEVL View Post

        I would love that, but the donors are more difficult to find and demand a lot more money.
        what is an 8.1L demanding?

        Comment


          #5
          Originally posted by TRINDU View Post

          This.

          While the 6.0 will have more horsetorques than the gofitty4, its still a high strung engine. I'd have something deeper than 3.73s for towing.

          considering the 6.0 came with a 4l80e, I'd look into VB differences. should be plug and play if you get the entire donor.



          what is an 8.1L demanding?
          $4500 for a high mileage rust bucket. I do see an 8.1/Allison/t-case complete swap listed for $2700 on FB Marketplace, but its all the way down in Kansas City... and I am sure I would have to rebuild and modify the 263 for the pump rub issue on top of that... and not having my truck able to make that trip without blowing out an insane amount of oil on top of it all.
          Mrs CSR said I was good, or something.

          Comment


            #6
            Originally posted by DRTDEVL View Post

            $4500 for a high mileage rust bucket. I do see an 8.1/Allison/t-case complete swap listed for $2700 on FB Marketplace, but its all the way down in Kansas City... and I am sure I would have to rebuild and modify the 263 for the pump rub issue on top of that... and not having my truck able to make that trip without blowing out an insane amount of oil on top of it all.
            good to know. I'll hold onto me 8.1/Allison for safe keeping then.

            personally, I'd run a NP241/271 before screwing with the slip yoke GM gayness.

            Comment


              #7
              There is always the possibility the 6.0 needs a rebuild soon after you drop it in as well. The only one I ever owned ran and drove great on the test drive, then ended up having a lot of issues in a very short time.

              I'd honestly do the new long block and maybe put a 3/4 race cam or whatever gets a bit more power out of the fofiddyfo.

              Comment


                #8
                Last years of the old 3500hd and a couple years of the chevy express had the 8.1. I think 2000 and 2001, maybe 2002.

                Both of those I've seen cheaper than pickups with the 8.1

                Comment


                  #9
                  Originally posted by YotaAtieToo View Post
                  There is always the possibility the 6.0 needs a rebuild soon after you drop it in as well. The only one I ever owned ran and drove great on the test drive, then ended up having a lot of issues in a very short time.

                  I'd honestly do the new long block and maybe put a 3/4 race cam or whatever gets a bit more power out of the fofiddyfo.
                  Its funny you say that. I test drove this truck, and it ran flawlessly... for about a month. The leaks began *after* I changed the oil and went with regular 10w30 high mileage synthetic and a bottle of Lucas. I have since added a bunch of oil that it lost, and even a can of that engine restore snake oil junk, but all that did was allow me to drive it easily without blowing smoke out, I still can't go over 60.

                  As for more power out of the 454? Its pretty limited, due to the in-tank pump. I could always change out to a 1996 model year Vortec pump to get past that issue, but then the TBI itself becomes the issue, at 645 cfm. Only the most mild cam can be supported, and we're only talking a couple ponies at best.

                  Of course, I could always build a beast of an older 454 and carb it, but that's going backwards in reliability.
                  Last edited by DRTDEVL; 07-15-2020, 06:50 AM.
                  Mrs CSR said I was good, or something.

                  Comment


                    #10
                    Originally posted by DRTDEVL View Post

                    Its funny you say that. I test drove this truck, and it ran flawlessly... for about a month. The leaks began *after* I changed the oil and went with regular 10w30 high mileage synthetic and a bottle of Lucas. I have since added a bunch of oil that it lost, and even a can of that engine restore snake oil junk, but all that did was allow me to drive it easily without blowing smoke out, I still can't go over 60.

                    As for more power out of the 454? Its pretty limited, due to the in-tank pump. I could always change out to a 1996 model year Vortec pump to get past that issue, but then the TBI itself becomes the issue, at 645 cfm. Only the most mild cam can be supported, and we're only talking a couple ponies at best.

                    Of course, I could always build a beast of an older 454 and carb it, but that's going backwards in reliability.
                    Dual tbis? ​​​​​​

                    I may have gotten a pos, but I don't buy the 6.0 coolaid. Basically meh power and terrible millage. I know you can tune in more power, but you can't tune in more displacement.

                    Comment


                      #11
                      you didn't look hard. I found this in 5 minutes

                      8.1 for life!!!

                      https://minneapolis.craigslist.org/d...158305693.html

                      Comment


                        #12
                        How about the newer tbi efi systems that support more hp? Holley edelbrock and fi tec all make them. Put a cam in the 454 and swap on some 781 casting heads.

                        Comment


                          #13
                          https://minneapolis.craigslist.org/a...125974048.html

                          Comment


                            #14
                            8.1L and don't look back.

                            I love that engine.

                            Comment


                              #15
                              I guess I should look on CL... Cursory searches were on FB only.

                              Now, how to get that van back here with a bad tow rig...
                              Mrs CSR said I was good, or something.

                              Comment

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