Edelbrock E-Street vs Performer RPM Heads

Big Block A body Tech

  1. JGC403

    JGC403 Well-Known Member

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    What is the difference between these heads? On their website they have the exact same specs. Same intake and exhaust port volume, same valve sizes, same valve spring max lift, even the flow numbers are the same.

    So if the port size and heads flow the same how can the say the E-Street is for Idle-5500 rpm and the Performer RPM from 1500-6500 rpm?

    So where did they cut corners to save the $422 for the E-Street over the Performer RPM?


    Aluminum Cylinder Heads - Chrysler - Big-Block - E-Street - Edelbrock, LLC.

    Aluminum Cylinder Heads - Chrysler - Big-Block - Performer RPM - Edelbrock, LLC.
     
  2. rumblefish360

    rumblefish360 I have escaped the evil Empire State! FABO Gold Member

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    I remember this being discussed somewhere. IIRC, it has cheaper & different valves and a lighter valve spring.

    I am not 100% sure though.
     
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    • EchoSixMike

      EchoSixMike Well-Known Member

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      IIRC, the big difference was the E street heads have sintered iron valve seat (or other hardened material) vs the RPM heads. Might very well be misremembering things. S/F....Ken M
       
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      • mopower440

        mopower440 Well-Known Member

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        so has anyone here bought a set of E-streets for a big block and used them out of the box with no extra porting? Wondering how much performance was gained over the stock iron heads..
         
      • famous bob

        famous bob mopar misfit

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        Dont know, but have wondered the same thing, not that I`m in the market for any tho.
         
      • rumblefish360

        rumblefish360 I have escaped the evil Empire State! FABO Gold Member

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        The E street is exactly the same as a RPM head port wise. The “E” (for economy IMO) is due to the different valves, lighter springs and different valve seats.
        Who ever has done a iron to RPM head swap could tell you the performance difference.

        It was an excellent upgrade on my small block.
         
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        • mopower440

          mopower440 Well-Known Member

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          could you tell a major difference in power?
           
        • rumblefish360

          rumblefish360 I have escaped the evil Empire State! FABO Gold Member

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          In my small block?
          Oh freaking hell yea.
          I went from a stock port 2.02/1.60 iron J head to the RPM. Intake was a LD-340, carb a TQ, headers were hooker super comp (1-3/4) slugs at zero deck, 9.9-1 ratio, up 1 point with the head change. Cam, 292/.509. 4spd-4.10 E body Cuda.
          This cam didn’t take advantage of the heads flow ability with that tiny .509 lift. Taking advantage of it later was nice.
           
          Last edited: Jun 22, 2019
        • mopower440

          mopower440 Well-Known Member

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        • rumblefish360

          rumblefish360 I have escaped the evil Empire State! FABO Gold Member

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        • mopower440

          mopower440 Well-Known Member

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          well, those all say they use roller lifters only? I will be using a regular hydraulic flat tappet cam. I am looking in the 1300.00 price range and am kinda set on the 84cc E-streets, but just wanna make sure there arent any better flowing heads out there for the money than the E-streets.. Someone mentioned the promaxx and i wasnt sure if they were a good head or not as i havent heard much about them..?
           
        • rumblefish360

          rumblefish360 I have escaped the evil Empire State! FABO Gold Member

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          Call them and tell them the cam your run. I guess and the spring you want to run and they will install the spring of your choice if you want to make that call or the springs the cam manufacturer wants you to use.
           
        • Moms68

          Moms68 Member

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          Is it true that the big block E- Street heads have straight spark plug openings?
           
        • PRH

          PRH Well-Known Member

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          Edelbrock 5093 have straight plugs.
           
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          • 318willrun

            318willrun Utube channel 318willrun

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            Is one preferred over the other for exhaust manifold/header fitment? Or is it "the angle plug gives better fire" reason.
             
          • PRH

            PRH Well-Known Member

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            It’s both.
            Some headers just aren’t a good fit with angle plug heads........ but angled plugs are “better” for the combustion process.
             
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            • Muswagon

              Muswagon Well-Known Member

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              I just got a set of E street, you do not need the RPM heads at the higher cost unless you are running a roller cam. Even that part is a bit confusing as they both say good to .600 lift. Mine are for the 440 I am building for my Duster. (5090 heads)

              My cousin has a home based head porting shop, and he did some light work on my heads and the difference is crazy. He has not even corrected the valve job yet and they are already flowing over 300 without having to make the intake runner too big and hurt the low end. I will post another one once he corrects the factory valve job.

              Sorry, I don't know why it attached twice

              upload_2022-1-14_7-25-48.png

              upload_2022-1-14_7-23-3.png
               
            • RAMM

              RAMM Well-Known Member

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              The Eddy 5090 is probably my favourite go to aluminum head--The 75cc chamber is a real bonus if you can build around it which is easy IMO. J.Rob
               
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              • Muswagon

                Muswagon Well-Known Member

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                That is exactly why I chose the 5090 with the smaller chamber. I can build my RV 440 as is and still have decent compression or build it and have 10.50 to 1
                 
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                • DC Dart

                  DC Dart Well-Known Member

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                  How much port work do the Edelbrock heads need to match the trick flows OOTB. I know it's likely cheaper to buy the trick flows for the given flow advantage. But can these E Street be made to flow like trick flow later on? Within reason I guess. Yeah I know define reason right. LOL
                   
                • PRH

                  PRH Well-Known Member

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                  There will likely be a few differing opinions on this, but I’ll preface my response with........
                  “On my flow bench”.......
                  (And I have performed hundreds of flow tests on BBM heads)
                  -I see 320 +/- cfm from an ootb TF240.
                  I have tested a dozen or so....... all very close to 320cfm.

                  -the highest flowing Ede style head I have tested was a MCH CNC ported Stealth, which actually had the intake runners 12cc’s larger than the TF240..... 252cc. It’s quite a bit of porting.
                  The program MCH uses on the Stealth is the same one they use on the Ede heads.
                  On my bench, that Stealth flowed 315cfm( I tested two cylinders, both flowed 315).

                  - if you’re going to have to rely on paying someone to get the Ede’s into the 320cfm range......buying the TF’s will end being quite a bit cheaper.
                  If you’re a skilled head porter and can do the work yourself........ you’ll end up paying yourself minimum wage to end up at “even money” compared to the TF’s.
                   
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                  • Dartnut

                    Dartnut Don't hate me because i'm beautiful

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                    What I don't get is why do we have to get the aftermarket heads checked out for valve job, guide fitment, etc. and why are they not ready to bolt on OOTB?
                    Other than changing springs that match your cam, why do they even have to be touched or checked at all?
                    That is something that has always irked me.
                    Is their quality control that piss poor, or do they not even care?
                    They must be just literally slapped together on old misadjusted equipment or by assemblers who don't know or care a lot about their customers.....
                     
                  • PRH

                    PRH Well-Known Member

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                    Nobody is making you have the heads checked out.
                    Just like you don’t “have to” check any clearances when assembling a motor, or degree in your cam.

                    Yesterday I got a text from a builder I do a lot of work for.
                    He had a blown BBC on the dyno and was just giving me a dyno report.
                    That motor got some new Brodix Race Rite heads put on it.
                    They were run basically ootb(inner springs removed for cam break in).

                    I’m sure industry wide there is a fairly high percentage of aftermarket heads that get installed right ootb.
                    Sometimes that ends up successful...... and sometimes not.
                     
                  • 318willrun

                    318willrun Utube channel 318willrun

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                    I'm not a huge buyer of aftermarket heads, but I disassembled my Speedmaster small block heads at home and inspected, found nothing, reassembled and no issues. It doesn't get driven a lot, but they've worked fine. So, some may be just fine OOTB
                     
                    Last edited: Jan 14, 2022 at 4:44 PM
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                    • IQ52

                      IQ52 Well-Known Member

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                      I can state that the E Street/RPM casting, in well ported form, without epoxy or welding can support 780+ horsepower using a 451 stroker and 91 octane pump gas.
                       
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