FE Power Forums
FE Power Forums => Private Classifieds => Topic started by: FESCJ on March 14, 2025, 03:00:40 AM
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Looking into using an Edelbrock Performer RPM intake on my 428. I am seeing a lot of Ebay listings for an RPM "knock off" intake in the low $200 dollar price range. Anybody use one of these yet?
I will be replacing an original Holley Street Dominator intake as I believe the Performer RPM is better intended for my purpose. Any thoughts?
Thanks,
Brian N
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There is info on the site, buyer beware mostly. Basically, if you get a good one, they work well. However, some don't have passages drilled, some are crooked, and of course they fund a country we are trying not to be reliant on.
Second, my experience is that there really isn't any magical gain of an RPM over a SM, especially if you do the Edelbrock mods to the SM. However, unless you can port yourself, likely cost more than the Chi-intake.
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Holley Street Dominator is better than the Edelbrock Streetmaster, totally different intakes. The Street Dominator's plenum is not made like the Streetmaster. Joe-JDC
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Holley Street Dominator is better than the Edelbrock Streetmaster, totally different intakes. The Street Dominator's plenum is not made like the Streetmaster. Joe-JDC
Thanks Joe, read it as SM but clearly Holley SD. As they say, RTFQ....I really like the Holley intake too, even more reason to not buy offshore IMHO.
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If your interested in changing your intake. This is what I would highly suggest you buy first:
https://fepower.net/GFEIC.html
In it 3 different 428 engines are tested, using 20 some intakes. There are also 3 more FE's engines tested, from 427 to 492 ci
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If your interested in changing your intake. This is what I would highly suggest you buy first:
https://fepower.net/GFEIC.html
In it 3 different 428 engines are tested, using 20 some intakes. There are also 3 more FE's engines tested, from 427 to 492 ci
Love that book, lots of great information! I can't imagine how many man-hours were expended doing all the testing and documentation.
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I had one of those Holley Street Dominator manifolds on my 68 Mustang F/B 390 4 spd.
CJ 735 cfm Holley up top, CJ iron exhaust manifolds, and 3.25 gears out back.
Comp 268H cam and 1.76 Melling iron adjustable rockers.
0.030" over Speed Pro forged pistons.
Heads were garden variety passenger car 390. (Not real sure, they did have the 16 bolt exhaust pattern, could have been CJ? IDK)
Back then I was not aware of all the different castings so I don't know the casting #'s.
That engine was a stout performer (sorry, no time slips or dyno data).
The butt dyno says it was pretty quick and had excellent street manners.
Sadly the car and that engine are long gone... much to my everlasting regret...
My opinion...
The Holley Street Dom is faaaar better than any chinesium RPM knock off.
Keep it, and spend the money elsewhere...
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I just ordered one of those books, hopefully there’s pictures so I can read it. I have the Edelbrock SM on a 428 build I did. 530hp, 600ftlb. I only dynoed with the one intake, which I’m regretting now. I had a street Dominator, and a few other options. I guess I’ll never be certain I made the right pick. I’m happy with how it turned out, it will work fine I’m sure.
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I appreciate all the responses! I don't have a problem keeping this Holley SD intake. It is installed in non ported form. Can I use it successfully out of the box, or should I opt for porting? It would seem that if I opt for porting, I would need to weigh in cost factor of the porting and shipping. Might get into used Performer RPM price territory? And, just so you know, I am running C6AE-R heads.
I haven't given you folks any build data on my engine, and I will if it helps? But my goal for the engine was a decent mannered 428 with 425hp and 500 lbs tq. The car it's going into is a 69 Cobra formal roof clone.
Thanks,
Brian
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More engine and car info the better. Additionally, it's always good to free up a little movement but that intake will support that power level.
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As a side note at this point, I did some poking around and found a nice undamaged Performer RPM intake for sale in California for $180 shipped! Seems like a really good deal! I mean, new ones from Jeg's or Summit are currently $700 dollars. I'll buy it and use it for a future project, don't think I should let it get away.
Brian
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As a side note at this point, I did some poking around and found a nice undamaged Performer RPM intake for sale in California for $180 shipped! Seems like a really good deal! I mean, new ones from Jeg's or Summit are currently $700 dollars. I'll buy it and use it for a future project, don't think I should let it get away.
Brian
Does it actually say "Edelbrock Performer RPM" on the manifold? The knock-offs look VERY similar. Is it close enough you can pick it up rather than ship? You know what they say, "If it sounds too good to be true..." Be careful!
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It is a real Edelbrock Performer RPM, not a knock off. I can only guess he has priced it the way he did due to the low price of the new Ebay knock off manifolds? Regardless, I'll get some more info. If I move forward with the deal, I would pay him with Paypal but not using friends and family. At least that way I'll have recourse if the deal goes south.
Brian
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Oh, forgot to mention that I cannot pick it up. The manifold is in San Francisco and I'm in Columbus, Ohio.
Brian
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be warned about scams coming out of sf.i have seen that add for a long time and i would not try to buy it and pay for it paypal or any other means.it seems that same ad has been on there for a few years!
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Too good to be true
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I’ve been watching that add myself. Pretty sure it’s not legit.
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That same intake was on craigslist here in Wisconsin. Same price, same pictures. As soon as I asked where to pick it up, the ad was pulled, only to resurface a couple weeks later.
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That intake was on craigslist last fall in Wisconsin. Same price, same pictures. When I asked where I could meet to pick it up, the ad was pulled. Resurfaced a couple weeks later, same game!
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I appreciate all the responses! I hear what you all are saying and I've put the Edelbrock Performer RPM out of my mind. Here is some build data on my engine;
1. 428 service block .030
2. Scat crank stock stroke
3. Lemans rods C6AE-E
4. Probe pistons -16cc
5. C6AE-R heads with CJ valves
6. XE274 cam
7. Milodon deep sump ( Ford S/S) style pan
8. Holley Street Dominator intake not ported
9. Autolite distributor with Pertronix
10. Holley 3310-1 780 cfm
Can I run this intake as is without porting it, or should I get it ported? I don't plan on any track time with my car, just local street driving. Oh, and the car is 69 Cobra formal roof clone with 9 inch 3.91 rear.
Thanks,
Brian
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Can I assume you do not have an original 428 crankshaft?
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Correct, I do not have an original crank. Engine balanced externally as built.
Brian
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I would recommend that you discard the LeMans rods and go with a modern replacement for them. They are very heavy, and that hinders real performance in most cases. To answer your original question, there is a whole blog about the offshore intake manifold in the forum section dealing with technical issues. I recently ported one of those intakes, and just a few weeks ago ported a RPM. I flowed both intakes before any port work, and after finishing the balance of runners and porting to within a few cfm of each other. The offshore intake as cast was about 15cfm better than the RPM, but with porting they are equal. The metal of the RPM is much denser and heavier than the offshore intake. The RPM flows ~305 cfm average as cast. Joe-JDC
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The only reason I brought up this thread was based on what I was told about my current intake and how it would compare to a Performer RPM. The people/friends that shared input said that the RPM would be better overall especially low end. I have no experience with an RPM nor the Holley SD which is currently on the engine. I trust this forum to always give me things straight............and I appreciate that. The real question for me at the moment is what to do with my Holley SD? Can I use it with my specific build as is and not ported? Or, should I have it ported? Would there be an advantage to the Performer manifold out of the box as is?
Thanks,
Brian
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Stay away from the Performer 390. The Performer RPM is a different intake manifold and flows ~305-307cfm average for all ports as cast. If your heads don't flow over 307 cfm at your camshaft lift, you would be fine with it. The Holley Street Dominator also flows good as cast, but when ported can be used on engines that can make upwards of 600 hp or more. If you have the HSD, then use it. A new Performer RPM is expensive, even from Summit. Joe-JDC
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I'm going to run the Holley SD as it is. Curious if I would gain anything with a carb spacer?
Thanks,
Brian