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will 3.8 heads work on a 3.1?

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  • #16
    To quote Dr. Hook "We're all goin to the freakers ball, ya'll"
    Tuning a car is full of compromises. You must decide if you are willing to give up either reliability, performance, or a whole load of cash. Also remember that repairs will seem to come up much more often as you strive for even more performance

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    • #17
      For the record, since no one has said it yet, the 3800 series and the 3100 have completely different histories and aren't even related. The 3800 is a 90 degree engine whereas the 3100 is a 60 degree. The 3800 was based off a V8 (essentially a V8 with two pistons chopped off), and the 3100 is in a series of V6s that were designed from the ground up. Not only will the bolts patterns more than likely be different, the intake manifolds and other items won't line up.

      Dual Outlet Exhaust with Resonator Delete, Front STB, Rear STB, GMPP Trailing Arms

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      • #18


        corvette plus beretta.
        Ben
        60DegreeV6.com
        WOT-Tech.com

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        • #19
          Originally posted by SappySE107 View Post

          http://www.ls1tech.com/forums/showthread.php?t=730443

          Corvette plus Civic called the "Civette".
          Links:
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          • #20
            3.1 MPFI (GEN 2)


            3100 SFI (GEN 3 version 1)


            3100 SFI (GEN 3 version 2)





            As you can see, they are not even really SIMILAR between the GEN 2 and GEN 3. The GEN 2 has a much larger upper intake manifold with long runners The GEN 3 has short runners, etc.
            Taylor
            1988 Olds Cutlass Supreme 3100 MPFI
            1990 Pontiac Grand Prix STE 3.1 MPFI
            1994 Olds Cutlass Supreme convertible
            1998 Lincoln Mark VIII
            "find something simple and complicate it"

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            • #21
              to put it simply, NO

              just to list a few obvious reasons why it won't work and why that guy isnt exactly "high on life alone"

              1. 3800 is a standard 90 degree v-6...
              2. wont bolt up....plain and simple, the overall shape is completely different
              3. yeah just a repeat....nothing will line up...NOTHING

              this kids on crack lmao
              http://profile.myspace.com/index.cfm...endid=14262310

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              • #22
                im suprised noone has mentioned that the 660 heads (atleast in gen3 form) have much better flow characteristics than that of the 3800 heads...

                one question though... wheres this kid live? please tell me its not around grove city or he didn't grow up there because if i know him im going to have to come home and kill someone... lol

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                • #23
                  I thought this thread was done a month ago...
                  -Brad-
                  89 Mustang : Future 60V6 Power
                  sigpic
                  Follow the build -> http://www.3x00swap.com/index.php?page=mustang-blog

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                  • #24
                    dont look at me

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                    • #25
                      Tell him to look at it this way.. 660's are small block v6's and 3.8ls-4.3Ls are big block v6's.. thats what I tell anyone who cant understand the therory between 60degrees and 90degrees
                      VIDEO Acadian http://videos.streetfire.net/video/8...7f00197eea.htm
                      VIDEO Chevette http://videos.streetfire.net/video/9...500156e11b.htm


                      Six-t-Six Motorsports
                      2.8L Chevette Roadcar
                      3.2L Acadian Racecar

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                      • #26
                        Actually 3.8's and 4.3's are 8cyl engines with two cyls hacked off.


                        Die thread, die!!! LMAO
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                        • #27
                          why waste the time and effort to do this? just 3800 swap! geez.....
                          Andy

                          sigpic

                          fastest 1/8: 10.19@ 67.17
                          fastest 1/4: 16.16@ 82.70

                          62mm TB, 1.6 roller tip rockers, Ostrich 2.0, UD pulley, TB heater bypass, K&N, 180* stat, No cat, 99Grand AM dual cooling fans. 4T65E swap FDR 3.69, EP LSD, F.A.S.T. transmission controller, TransGo shift kit.

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                          • #28
                            oh yeah.. thats always a great idea... 3800's suck monkey ballz.................




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                            • #29
                              sucks more to retro-fit those heads. (and fail miserably)
                              Andy

                              sigpic

                              fastest 1/8: 10.19@ 67.17
                              fastest 1/4: 16.16@ 82.70

                              62mm TB, 1.6 roller tip rockers, Ostrich 2.0, UD pulley, TB heater bypass, K&N, 180* stat, No cat, 99Grand AM dual cooling fans. 4T65E swap FDR 3.69, EP LSD, F.A.S.T. transmission controller, TransGo shift kit.

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                              • #30
                                Yeah, you mays well just weld them to the head when none of the holes line up, then put individual B&S lawnmower carbs on all the runners
                                VIDEO Acadian http://videos.streetfire.net/video/8...7f00197eea.htm
                                VIDEO Chevette http://videos.streetfire.net/video/9...500156e11b.htm


                                Six-t-Six Motorsports
                                2.8L Chevette Roadcar
                                3.2L Acadian Racecar

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