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Thornton SB Dual Exhaust Manifolds

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  • Thornton SB Dual Exhaust Manifolds

    Don't know why anyone would use these over headers but Thorton is producing small block counterparts of the W and Z manifolds:

    http://gawain.membrane.com/~thornton...manifolds.html

    Anyone know anybody running these?

  • #2
    Headers are not hard to install in a g-body Cutlass with a small block, why bother with divided port manifolds?
    They are still restrictive and heavy factory manifolds.
    Lightning Rods repair service:CLICK HERE
    Seller Feedback:CLICK HERE
    1988 H/OCA Advisor
    88 H/O #1 of 4
    88 CSC White/Claret - T-tops
    88 H/O Triple Black
    87 442 Black/Gray - T-tops
    85 442 White/Blue - T-tops
    85 442 White/Blue - T-tops
    85 442 White/Claret - T-tops
    85 442 White/Sage
    84 H/O Aero Commemorative #2199 - Sunroof
    83 H/O #2400 Sand Gray - Sunroof
    83 H/O #1607 Sand Gray - T-tops
    83 H/O #727 Maple
    "Keep them Rockets lit!"

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    • #3
      it depe nds ifyou wish to keep the car looking original
      I know the those where on BBO but still they look olds enough!
      Dan
      protouring cutlass 84:LT1+700R4 + 3:73 4 linked 9" ford diff ,dropped 2" ,4 wheel disc brakes....:power,handling,reliability ...

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      • #4
        Well that style of exhaust manifold never came original on any SBO so to me it is just a weight addition.

        Comment


        • #5
          Go with shorties...
          Lightning Rods repair service:CLICK HERE
          Seller Feedback:CLICK HERE
          1988 H/OCA Advisor
          88 H/O #1 of 4
          88 CSC White/Claret - T-tops
          88 H/O Triple Black
          87 442 Black/Gray - T-tops
          85 442 White/Blue - T-tops
          85 442 White/Blue - T-tops
          85 442 White/Claret - T-tops
          85 442 White/Sage
          84 H/O Aero Commemorative #2199 - Sunroof
          83 H/O #2400 Sand Gray - Sunroof
          83 H/O #1607 Sand Gray - T-tops
          83 H/O #727 Maple
          "Keep them Rockets lit!"

          Comment


          • #6
            http://store.summitracing.com/partde...part=hed-58160
            Attached Files
            Lightning Rods repair service:CLICK HERE
            Seller Feedback:CLICK HERE
            1988 H/OCA Advisor
            88 H/O #1 of 4
            88 CSC White/Claret - T-tops
            88 H/O Triple Black
            87 442 Black/Gray - T-tops
            85 442 White/Blue - T-tops
            85 442 White/Blue - T-tops
            85 442 White/Claret - T-tops
            85 442 White/Sage
            84 H/O Aero Commemorative #2199 - Sunroof
            83 H/O #2400 Sand Gray - Sunroof
            83 H/O #1607 Sand Gray - T-tops
            83 H/O #727 Maple
            "Keep them Rockets lit!"

            Comment


            • #7
              if you are running in a class that requires it too be factory appearing they are just the ticket. you can have them extrude honed and they will actually flow quite well.
              1987 Corvette L98/700r4
              2005 Equinox
              2000 GTP 3.8 S/C
              2002 Regal GS 3.8 S/C
              1972 Cutlass S

              Comment


              • #8
                Originally posted by gator2206 View Post
                if you are running in a class that requires it too be factory appearing they are just the ticket. you can have them extrude honed and they will actually flow quite well.
                For sure, they are good if you are putting them in a show car or something along those lines. I was unsure if the look of them would hurt you points wise since they don't look like any factory SB manifold.

                I have also been vary wary of cast manifolds. I had a nice pair of W/Z manifolds on my 88 and when I went to replace them with headers they had a few cracks in them.
                Plus I have seen many broken bosses and cracked ports on ones that come up for sale...
                But you can't beat new and it's awesome that Thorton's is putting the effort in providing these to the community. Metal today is much higher quality and I'm sure these will handle anything you throw at them.
                Lightning Rods repair service:CLICK HERE
                Seller Feedback:CLICK HERE
                1988 H/OCA Advisor
                88 H/O #1 of 4
                88 CSC White/Claret - T-tops
                88 H/O Triple Black
                87 442 Black/Gray - T-tops
                85 442 White/Blue - T-tops
                85 442 White/Blue - T-tops
                85 442 White/Claret - T-tops
                85 442 White/Sage
                84 H/O Aero Commemorative #2199 - Sunroof
                83 H/O #2400 Sand Gray - Sunroof
                83 H/O #1607 Sand Gray - T-tops
                83 H/O #727 Maple
                "Keep them Rockets lit!"

                Comment

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