Edelbrock E-Street Heads - Angle Plug Clearance w/Heddman Headers?

Engine, Trans & Driveline

  1. PurpleBeeper

    PurpleBeeper Well-Known Member

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    Are there any spark plug clearance problems with Edelbrock 5090 heads with the angled plugs using old Heddman 1-5/8" headers? I've heard stock manifolds can have an issue.

    Which way are the plugs angled? I guess I can take a look at my motor. I know a couple plug wires are pretty close to the headers now. From the picture, it just looks like the two center plugs are angled outwards & the outer plugs are straight.

    Also, I think I "heard" their single valve springs were junk??? I'll be running a mild street cam, maybe a Comp Cams XE274 or similar & stock valve gear.

    Anything else I should know about these heads before I buy them?
    edl-5090_xl.jpg

    https://www.summitracing.com/parts/edl-5090/overview/make/plymouth

    THANKS EVERYONE!
     
  2. 1967coronet440

    1967coronet440 FBBO Gold Member FBBO Gold Member

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    The springs are meant to be run with a hydraulic flat Tappet cam, get springs that match your cam.
     
  3. Bee1971

    Bee1971 Well-Known Member

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    If Your Running Flat Top Pistons With No Valve Reliefs , Check Valve Clearance With Any Cam , Lesson Learned For Me , And My Pistons Where Still .015 In The Hole Running .039 Head Gaskets - Mopar 284 - 484 Camshaft

    All I did was switch from Rebuilt Factory 906 Heads after 15 years to the E Street 5090 Heads Last Spring

    Two Intake Valves Kissed The Pistons within 200 miles , 5800 Rpms

    Anyways We Shall See What These Same Heads Will Run On My Now (Same Vin #s Motor) 432 Stroker In My 71 Bee This Spring

    Click On Link

    Hooker Headers

    http://www.hughesengines.com/TechArticles/10hpmanifoldshookersupercompheadersonbigblockangle.php
     
    • Thanks! Thanks! x 1
    • PurpleBeeper

      PurpleBeeper Well-Known Member

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      Thanks 1967, it is a flat tappet hydraulic cam (comp cams XE274). I think the new comp cams number for it is 21-224-4
      or CRB XE274H-10
      274/286, 488/491, 230/236@.050", 110 lobe separation, hydraulic flat tappet
      https://www.summitracing.com/parts/cca-21-224-4/overview/make/plymouth

      Are the standard single springs on these Edelbrock heads OK for my use?
       
    • 1967coronet440

      1967coronet440 FBBO Gold Member FBBO Gold Member

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      Ahhh ok I thought that was a solid roller cam you listed... yes I believe they will, I think eddy says the springs can handle .600 lift which your well below, are you going to have them gone through before installing? Maybe ask the machinist just to be sure.
       
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      • PurpleBeeper

        PurpleBeeper Well-Known Member

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        Good advice bee... I will clay the pistons. I'm looking at buying the "E-street" 5090 heads. Are the plugs angled basically the same? The link seems to show each two pairs of plugs angled inwards (1/3, 5/7, 2/4, 6/8). If that's the way the E-street heads are angled, then I guess I can just look at my straight plug iron heads & headers (in car now) and get an idea if I will have any clearance issues or not.
         
      • PurpleBeeper

        PurpleBeeper Well-Known Member

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        Thanks 1967... yes, everyone says don't use heads out of the box & I plan on taking LONG road trips with this new setup, so I will have a machinist take a look at all my parts before putting the engine together. I would NEVER hear the end of it if (God forbid) we broke down 2 states away with the baby in the car.
         
      • Lelo 500

        Lelo 500 Well-Known Member

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        Another thing I noticed about the E Street head is powdered steel valve seats. What's that all about?
         
      • Bee1971

        Bee1971 Well-Known Member

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        Price

        What's the difference in an "E-Street" head and the standard "RPM" head?

        1. The E-Street head uses a less expensive (a little heavier) valve than the RPM head.
        2. The E-Street head has powder metal valve seats whereas the RPM heads use ductile iron seats, which in our opinion is a better seat material - it is harder and lasts longer but is harder to machine.
        3. The E-Street heads do not get hand blended valve bowls from Edelbrock. The RPM heads do.
         
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        • PurpleBeeper

          PurpleBeeper Well-Known Member

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          Ok guys, if the E-street Edelbrock heads' plugs angle inwards in pairs of two cylinders, then it looks like I'm OK with all the cylinders EXCEPT #6. That one is pretty tight between 2 header tubes. The only thing I can think of is to run a really long wire to #6, come in from below & use the old Direct Connection "multi-angle" plug terminals. Will that work? Do they still make those plug terminals?

          Plug 6 Clearance PicB.jpg Plug 6 Clearance PicA.jpg

          I can't find a picture of those old DC plug ends (hope I still have at least one). You would cut the end off a plug wire (or use make-your-own wires). One half of the DC terminal would screw into the graphite core of the plug wire. The other half screwed to the first half & attached to the plug. Because the two halves screwed together, you could get just about any angle on the terminal end. They saved my rear end (& wires) more than once while running headers.
           
          Last edited: Jan 12, 2018 at 7:07 PM
        • 1967coronet440

          1967coronet440 FBBO Gold Member FBBO Gold Member

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          4EF21723-57C4-46D5-A178-3FC464923C54.jpeg Looks like it’ll be close, I bought a set of msd cut to fit wires so I can make it as clean and fit as best possible, I have the Edelbrock victor MW heads which are also angled plugs and TTI 2” headers.
           
        • PurpleBeeper

          PurpleBeeper Well-Known Member

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          Yes, my #6 looks like your #3, but you have quite a bit more clearance that I do. They do sell wire by the foot...but I'm worried about the terminal end itself, even with a "heat sock" on it. Right now, my #6 plug can only use a long straight boot & I have to change it out every so often because it melts.

          What does everyone else think I should do? Do they still make the mulit-angle boots? I seem to remember Accel had some "shorty" spark plugs for header clearance too (?). The heads are a good deal, but I'm REALLY nervous about dropping a motor in & running into a problem. New headers aren't in the budget.
           
        • wyrmrider

          wyrmrider Well-Known Member

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          Powdered seats
          actually sintered
          If you get the good dura bond ones you have the best
          Durabond bought a mfg in Washington State that we had been testing
          I've used martin Wells Well Tight and most other high nickel or nickel based seats- "stellite"
          experimenting on propane, natural gas, and pollution control remediation gas
          that said there may be other vendors of sintered seats so BVVC - there are also a lot of very bad seats out there especially ones called "chrome molly"
          you have to deal with the problem of micro welding of the valve to the seat