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Old 06-16-2009, 06:28 PM   #1
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Default Edelbrock vs. stock heads

Is there really a big advantage gain in putting the edelbrock olds heads on a 455 instead of a set of worked heads?
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Old 06-16-2009, 06:35 PM   #2
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Default Re: Edelbrock vs. stock heads

On your 72, I'd say not a HUGE difference.
Your 40cc pistons will always make it kind of a dog.

If you put edelbrocks on a 69 motor with the shallow pistons, you'd probably go a whole second faster than the stockers though.
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Old 06-16-2009, 06:37 PM   #3
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Default Re: Edelbrock vs. stock heads

I have always heard there is nothing really special. They don't flow much better than stock ones and the combustion chambers are pretty big. I am pretty sure it is pretty much the same design as the stock ones.

I think the advantages are weight savings and are much easier to port since they are aluminum.
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Old 06-16-2009, 06:43 PM   #4
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Default Re: Edelbrock vs. stock heads

They are a few cc's smaller, but not much. According to what I've read they flow a little better in stock form than factory heads. The big advantage to them is that they are easy to port being aluminum, and way lighter.
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Old 06-16-2009, 06:44 PM   #5
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Default Re: Edelbrock vs. stock heads

Stock bracketry problems as well.
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Old 06-16-2009, 06:47 PM   #6
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Default Re: Edelbrock vs. stock heads

The chamber and ports, exhaust floor raised etc., are better than stock. 1990 technology compared to 1960/1970 technology.
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Old 06-16-2009, 06:55 PM   #7
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Default Re: Edelbrock vs. stock heads

Additionally, I've never heard of 35-40 year-old-heads coming with any sort of warranty. You'd also eliminate the risk of mismatching parts if you went with the (complete) Edelbrock heads.
J-Chicago, what bracketry has fitment issues with the Edelbrock heads? I've never heard that problem before, unless you're talking about putting them on an sbo engine (i.e. fuel pump problems).

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Old 06-16-2009, 07:35 PM   #8
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Default Re: Edelbrock vs. stock heads

I was going to go with "C" heads instead if there weren't much of a difference.
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Old 06-16-2009, 07:41 PM   #9
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Default Re: Edelbrock vs. stock heads

Depends on how much work you need to do. You could easily sink a grand into them if you do seats and new hardware. Add for crack repairs. Add for porting. Add for filling crossover. Add for welding/brazing the divider on center exhaust ports....
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Old 06-17-2009, 12:18 AM   #10
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Default Re: Edelbrock vs. stock heads

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Add for welding/brazing the divider on center exhaust ports....
It's just as easy to have the whole exhaust side milled down to the center divider. Shorterer gas exit as well.
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Old 06-17-2009, 12:47 AM   #11
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Default Re: Edelbrock vs. stock heads

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Originally Posted by GoldOlds View Post
J-Chicago, what bracketry has fitment issues with the Edelbrock heads? I've never heard that problem before, unless you're talking about putting them on an sbo engine (i.e. fuel pump problems).
- GoldOlds
If you keep everything the same, the stock brackets should work out fine.

However, if you moved the alternator to the passenger side with some sort of aftermarket bracket, you will have a big crap cluster there.
Fuel pump, alternator, lower hose, motor plate all in one spot.

I was just remembering the fuel pump/sbo issue and thinking out loud.

Last edited by J-(Chicago) : 06-17-2009 at 12:49 AM.
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Old 06-17-2009, 03:02 AM   #12
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Default Re: Edelbrock vs. stock heads

I use to have a pair of small valve C heads on my 69. They were rebuilt with a 3 angle valve job, good springs, port matched and milled .060. About 9 years ago I installed a pair of Edelbrock heads. The only things I change was what was necesary to install them, with the exception of milling them .060 to match my intake. The car ran 8.20 1/8 mile with the stock heads, ran 7.90 with the Edelbrocks. No changes other than what I said. Im not sure if I had a junk set of C heads but the Edelbrocks were worth 3 tenths 1/8 mile. I really think the even though they Edelbrocks dont flow much better total cfm they must flow much better at lower valve lifts.
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Old 06-17-2009, 09:15 AM   #13
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Default Re: Edelbrock vs. stock heads

Quote:
Originally Posted by ProjectHeaven View Post
Is there really a big advantage gain in putting the edelbrock olds heads on a 455 instead of a set of worked heads?
I think you would have to define "worked heads". I just got a set of StageII heads from J&S Machine that Jim says will flow better than out-of-the-box Edelbrocks, but these are totally redone - ported (by someone who knows Olds heads and has a flow bench to verify what is being done provides a real gain), polished, new oversizd valves, new springs, welded dividers, blocked crossovers, etc.
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Last edited by 71CutlassConvertible : 06-17-2009 at 09:18 AM.
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Old 06-17-2009, 04:03 PM   #14
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Default Re: Edelbrock vs. stock heads

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Originally Posted by matt69cutlass View Post
I use to have a pair of small valve C heads on my 69. They were rebuilt with a 3 angle valve job, good springs, port matched and milled .060. About 9 years ago I installed a pair of Edelbrock heads. The only things I change was what was necesary to install them, with the exception of milling them .060 to match my intake. The car ran 8.20 1/8 mile with the stock heads, ran 7.90 with the Edelbrocks. No changes other than what I said. Im not sure if I had a junk set of C heads but the Edelbrocks were worth 3 tenths 1/8 mile. I really think the even though they Edelbrocks dont flow much better total cfm they must flow much better at lower valve lifts.
3 tenths????? Hard for me to believe. But that is JMHO.
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Old 06-17-2009, 04:30 PM   #15
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Default Re: Edelbrock vs. stock heads

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Originally Posted by 71CutlassConvertible View Post
I think you would have to define "worked heads". I just got a set of StageII heads from J&S Machine that Jim says will flow better than out-of-the-box Edelbrocks, but these are totally redone - ported (by someone who knows Olds heads and has a flow bench to verify what is being done provides a real gain), polished, new oversizd valves, new springs, welded dividers, blocked crossovers, etc.
what did that cost u including shipping?
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Old 06-17-2009, 05:07 PM   #16
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Default Re: Edelbrock vs. stock heads

Quote:
Originally Posted by 71CutlassConvertible View Post
I think you would have to define "worked heads". I just got a set of StageII heads from J&S Machine that Jim says will flow better than out-of-the-box Edelbrocks, but these are totally redone - ported (by someone who knows Olds heads and has a flow bench to verify what is being done provides a real gain), polished, new oversizd valves, new springs, welded dividers, blocked crossovers, etc.
Be interesting to see the difference at the track or dyno. Flow numbers aren't everything, and it's real easy to make a flow bench lie. A flow bench is NOT an engine.


And what intake manifold? Head flow means nothing if the intake is a choke point.
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Old 06-17-2009, 05:08 PM   #17
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Default Re: Edelbrock vs. stock heads

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what did that cost u including shipping?
X2
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Old 06-17-2009, 05:52 PM   #18
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Default Re: Edelbrock vs. stock heads

Pricing is at the bottom of the page.

http://www.jsmachineoldsmobile.com/STAGEHEADS.html

Total including cores and shipping was $1350.
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Old 06-17-2009, 05:55 PM   #19
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Default Re: Edelbrock vs. stock heads

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Be interesting to see the difference at the track or dyno.
Yes, I agree, but in my case there is no way to get "before" and "after" data since this will be a newly built engine and I am not going to buy a set of Edelbrocks just to see the difference.
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Old 06-17-2009, 06:58 PM   #20
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Default Re: Edelbrock vs. stock heads

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Originally Posted by 71CutlassConvertible View Post
Pricing is at the bottom of the page.

http://www.jsmachineoldsmobile.com/STAGEHEADS.html

Total including cores and shipping was $1350.
Not a horrible deal, but it makes the decision to go with Edelbrock heads a no brainer. 50-60 lb weight savings off the nose of the car is a big deal. That's not opinion, just physics. Even at Edelbrock list prices, you won't lose 50-60 lbs cheaper than $300.

I purchased one set of Edelbrock heads NIB complete for $1250, and a used set with a fresh valve job, seals, springs and rockers for $1300. There are sets on ROP and craigslist all the time. I missed a 403 with Edelbrock heads on Craigslist a few weeks ago. Whole engine was $450. On the other hand, I have a set of #7As just like those that I picked up fresh from the machine shop for right around $400 shipped and a set of big valve E's fresh from the machine shop for $450 on ebay. I'd look for a deal no matter which way you go. Unless you have correct heads or want to race in a class where you have to have the right numbers, spending $1350 on a set of Iron Olds heads is just nuts.
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Old 06-17-2009, 07:26 PM   #21
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Default Re: Edelbrock vs. stock heads

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3 tenths????? Hard for me to believe. But that is JMHO.
Ive had several people tell me the same thing. But no BS, worth 3 tenths. Like I said, Im not sure if I had a screwed up C heads or severly mismatched ports or some other underlining problem that was corrected with the Edelbrocks. Without question, the best bang for the buck in this case!
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Old 06-17-2009, 07:38 PM   #22
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Default Re: Edelbrock vs. stock heads

Matt I was just curious, because that would take around 50-60 hp. You are correct, you could have corrected a problem or got a real good pair of E-brocks.

Keith, what did your E-brocks flow?
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Old 06-17-2009, 07:58 PM   #23
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Default Re: Edelbrock vs. stock heads

BTR has said before that the box stock E-brocks will consistently beat mildly worked factory heads. I'm sure that the flow bench isn't telling the whole tale, of course what isn't mentioned with those flow numbers is velocity. The E-brock heads have quite a bit of difference on the exhaust side especially compared to the stockers...
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Old 06-17-2009, 08:01 PM   #24
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Default Re: Edelbrock vs. stock heads

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Matt I was just curious, because that would take around 50-60 hp. You are correct, you could have corrected a problem or got a real good pair of E-brocks.

Keith, what did your E-brocks flow?
Don't know about either of those 2 sets, but I do know that on BOTH sets of NIB Edelbrocks I've bought or traded over the years, all four heads had valves that seated properly and held the CC fluid right out of the box.
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Old 06-17-2009, 09:48 PM   #25
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Default Re: Edelbrock vs. stock heads

Hey olds school whats your fastest time again down the track? Like 16 sec or something?! Your a true expert on EVERY subject.Why don't you move out of mommy and daddy's house and make it to an olds race sometime and show us what you can do.
Fact,my 403 with J&S machine #5 SB heads is currently running 7:40's in the 1/8th 11:50's or so in the 1/4.One particular 461 cu in BB olds @ my track runs E-brock heads and more cam and is running 7:80's.Does that prove anything other than cast iron heads do work when properly done,just listen to my many customers on and off the track!!
http://jsmachineoldsmobile.com/customerrides.html
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