Anyone put headers in a 66-67 GS 4 Speed?

Discussion in 'Street/strip 400/430/455' started by NZ GS 400, Oct 4, 2019.

  1. NZ GS 400

    NZ GS 400 Gold Level Contributor

    Hi all,

    I have a set of what I was told were probably either TA or Poston (see pic). I have been trying to get the driver's side header into place. passengers side is easy. Currently, the engine (455) is in without the z bar installed. I am thinking that with a lift, the header will fit in there as things are, but I don't have one. I have read before that it would be better to lay it in with the engine out of the way, and then lower her back in.

    my concern before I do that is fitment with the z bar in place. I expect to have to make some dimples, but is it even doable? I also realize that the brake lines will need to be re-routed. Thanks for your input in advance.

    Attached Files:

    Last edited: Oct 4, 2019
  2. Bens99gtp

    Bens99gtp Well-Known Member

    Not sure on a 67, but on most from under is easier. Our 72 we used to set the motor in over top them all the time. So time those square casting ears car be a real problem. Cutting them off with a seawall pretty much flush makes alot of room surprisingly. It's not a hard cut, but not a fast on either. The one in the rear will cause more issues with the one up front.

    Might also have to remove steering shaft or separate rag joint to get it to flex through
  3. NZ GS 400

    NZ GS 400 Gold Level Contributor

    Thanks Ben. I was thinking of just undoing the driver side mount and crossmember bolts and lifting the engine on that side by an inch or two. is it ok to try that, or will it do any harm to keep the passenger mount attached? As I said before, the passenger side header will fit with the engine secured on both sides.
  4. Bigpig455

    Bigpig455 Fastest of the slow....

    I just took mine out on a 71 : x2 on those casting ears. Get rid of them before you start the job. You should be able to rock the engine over to the passenger side for access, but I just disconnected the steering column and moved the shaft over, it seemed to be easier. also had to take all the shims out of the upper A-frames and push those outboard
  5. Dan Gerber

    Dan Gerber Platinum Level Contributor

    Casting ears? What “casting ears”?

    This may be something that we all should be aware of.
  6. Bigpig455

    Bigpig455 Fastest of the slow....

    there are two blockish "casting ears" on either side of the block along side the water jacket right below the deck. When working in tight quarters (alongside the steering shaft, etc..) they prevent the header flange from being rotated to pull the header out from under the car, or they catch a tube when pulling the header back. they are pretty clear in this pic:


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