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Thread: New crop of headers have oversized primaries. Where are the small primary headers?

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    Default New crop of headers have oversized primaries. Where are the small primary headers?

    I am shopping for a solid header for a mild ZX2 that is built specifically for road racing. The motor will be a refreshed with an OE-like build with some bolt-ons. Typically racing in the 3000-6500 rpm range, with occasional moments at 7,000 rpm. When I look at these ZX2 specific headers on ebay, they all seem to have 1.75" ID primaries, which to me seems way to large. I am looking for primaries around 1.5", but I am not finding them for the ZX2. When I search for the ZX3 Focus, I find some options, but not sure these clear the oil pan or chassis.

    Any recommendation on a small primary header that is currently available on the market now?

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    An OBX SVT Focus header that goes 4-2-1 will fit. If you want smaller pipe, look for a factory SVT Focus header as the OBX has larger dia. You will have to fabricate a section of the exhaust to meet up with the zx2's exhaust at the 2 bolt flange on the flex pipe. You will also have to notch the rad support cross member slightly. The notch is minor and with welding skills. You can plate the tube you notch into to, to add the strength back. These pics show the header's fitment and the notch to be made for an SVT style header. For reference, this is a complete front to back custom exhaust.




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    What about the non-SVT ZX3 Focus headers? I am looking at these, but I am concerned as the secondaries seem to be pretty well centered, where as the ZX2 headers are offset to driver side to clear oil pan.

    Examples:
    https://www.ebay.com/itm/OBX-Exhaust...53.m1438.l2649
    https://www.ebay.com/itm/OBX-Silver-...dV~ZPO&vxp=mtr
    https://www.ebay.com/itm/Ford-Focus-...CModel%3AFocus

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    Quote Originally Posted by BryanPendleton View Post
    What about the non-SVT ZX3 Focus headers? I am looking at these, but I am concerned as the secondaries seem to be pretty well centered, where as the ZX2 headers are offset to driver side to clear oil pan.

    Examples:
    https://www.ebay.com/itm/OBX-Exhaust...53.m1438.l2649
    https://www.ebay.com/itm/OBX-Silver-...dV~ZPO&vxp=mtr
    https://www.ebay.com/itm/Ford-Focus-...CModel%3AFocus
    You're 1st two links seem doable. The last one I wouldn't because all the other piping you're buying wont fit. You will still have to fabricate pipe to connect the ones you're looking at to the rear zx2 exhaust.

    Here's the front view of a svt header. It's offset like a zx2


    Here's another photo that compares svt to factory ZX3. You can see the factory setup is offset at the bottom as well.

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    Default New crop of headers have oversized primaries. Where are the small primary headers?

    Cool. My main concern was the header clearing the oil pan, as they are slightly different, with the zx3 oil pan appearing to have a bit more clearance than the zx2 oil pan. I realize that fabrication is required to mate the exhaust system to the header, but that is easy stuff. Think I will pull the trigger.

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    Worse case you will have to modify the collector of the header. I bought my box SVT header off a member who has a 3" collector on it. So I cut it off and made it 2.5" hence why that portion of the header is black.

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    Good news is the OBX base ZX3 4-2-1 header (1.5" primaries, 2.25" collector) arrived. Bad news, the secondaries interfere with the oil pan. We haven't decided if we are going to modify the oil pan or modify the header, yet.

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    Would just cutting the collector off and re angling it work?

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    No, its not the collector that is the problem, or at least the initial problem is when the secondaries make the first bend, the passenger side secondary collides with the oil pan.

    What is the SVT focus primary size?

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    I've got an obx svtf exhaust manifold on my s/r race car. In road racing depending on the track their are way better gains to be had by suspension geometry

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    Default New crop of headers have oversized primaries. Where are the small primary headers?

    Quote Originally Posted by gotts2bme View Post
    I've got an obx svtf exhaust manifold on my s/r race car. In road racing depending on the track their are way better gains to be had by suspension geometry
    We have a fully custom fabricated suspension (not by choice, but by necessity) already with adjustable ride height, rebound adjustment, castor/camber, etc, running 245/40 on 15x8in wide wheels and other goodies for improved suspension geometry and dynamics. We just recently blew our motor and blew a hole (since have not determined source of failure, as we are rebuilding our backup) in our pacesetter manifold. To replace the old pacesetter, we are just looking for a 421 or Longtube header, since we are getting a penalty already for aftermarket header.
    Last edited by BryanPendleton; 01-06-2018 at 09:41 PM.

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    I have an SVT header, factory, that has been cut off in the middle of the bottom bend where it's only two runners. If you think you could fab up something from there and make use of it, I'll part with it for a decent price.

    I also have a 4-1 header that looks like the shinny $102 one posted above. Seeing how cheap a new one is, I might be better to just go that route if you wanted one of those. It's for a base focus zetec, I don't actually own an escort just foci

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    I appreciate the offer, but already purchased a SVT Header. Based on performance results installed on the base focus, I think this will fit our application nicely.

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    As soon as the SVT header comes in I will put my calipers on it and gather up what geometry I can for those interested.

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    The SVT Header installed today. Went in relatively easy in our race car. No accessories to deal with, and no need to move the dip stick either. The crossmember did have to be cut, but that went relatively smoothly with an angle grinder and cut-off wheel. We will need to fabricate a pipe to connect the header to the exhaust, but that should also be relatively easy, as the header alignment with the path through the oil pan is good.

    i did put my calipers to the Focus SVT Header, but unfortunately, its difficult to get a good "nominal" dimension. OD measurements of the primaries varied from 1.6xx to as much as maybe 1.7xx. It is fairly heavy wall. I measured the ID at the mounting flange, and the ID was ~1.55".

    Unfortunately, our install is only temporary and it was being mocked up on a blown motor that will be pulled shortly, for a fresh build.

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