Re: 452 vs 906 HEADS
[Re: Polaramc]
#1521421
10/22/13 12:48 PM
10/22/13 12:48 PM
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Joined: Jun 2006
Posts: 5,159
CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,159
CT
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It depends on what the 906s flow and what they cost. You will have basically no change in compression with them. The Edelbrocks should bump you up but keep you under 10:1, how far under depends on which ones you buy. Professionally ported 906s can mean tons of different things.
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: 452 vs 906 HEADS
[Re: Polaramc]
#1521423
10/22/13 01:23 PM
10/22/13 01:23 PM
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Joined: May 2003
Posts: 6,559
Downtown Roebuck Ont
Twostick
Still wishing...
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Still wishing...
Joined: May 2003
Posts: 6,559
Downtown Roebuck Ont
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Some more info is needed but the short answer as far as performance goes is yes IF the 452's are stock and the 906's are as advertised and ported PROPERLY. As far as compression goes you would need to know what the chamber volume is on the 906 compared to the 452. Stock 452 IIRC are 88cc advertised which was in reality on average in the 90's given mfg tolerances of the day. Stock 906 will be basically the same. Now comes the rub if you will.  Iron open chamber heads and over 9:1 compression can sometimes get you into issues with pump gas. Then you have the fact that these heads are over 40 yrs old and depending on how massaged they are will be prone to cracking. For those 2 reasons alone I wouldn't go there unless they were like the price of a basic valve job on the ones I had ie $2-300ish. The Edelbrocks with 84cc closed chambers will give you a bump in compression (.75?), will likely flow as well or better out of the box as the massaged 906's and might be able to do it on 87 regular or mid grade at worst. Not knowing the rest of your combo I would guess you could be bolting on as much as 50-60 HP with no other changes. JMHO Kevin
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Re: 452 vs 906 HEADS
[Re: Twostick]
#1521424
10/22/13 08:13 PM
10/22/13 08:13 PM
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Joined: Oct 2007
Posts: 1,973
SoCal
jake4cars
top fuel
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top fuel
Joined: Oct 2007
Posts: 1,973
SoCal
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I have ported many sets of heads over the years and always liked the 452's, that being said if economics are the main factor then I would suggest the Eddy's. The ported 906's will have an advantage over the unported 452's but will not be as good as the EDDY's. The 906's will not have hardened seats for today's gas unless someone had them installed whereas the 452's and the Eddy's will have hardened seats from the factory. just my  Joey
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Re: 452 vs 906 HEADS
[Re: RapidRobert]
#1521426
10/23/13 03:01 PM
10/23/13 03:01 PM
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Joined: Feb 2003
Posts: 12,675
Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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What is your actual compression now?
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: 452 vs 906 HEADS
[Re: RapidRobert]
#1521427
10/24/13 09:40 PM
10/24/13 09:40 PM
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Joined: Oct 2011
Posts: 559
Idaho
LaRoy Engines
mopar
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mopar
Joined: Oct 2011
Posts: 559
Idaho
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Quote:
Quote:
I would like to raise my compression, Or should I just buy Edelbrock heads? If I go the Edelbrock rout, which heads would give me better performance without raising the compression over 10:1?
Absolutely get the eddies rather than the antiquated 906's (even if pro worked). With the closed chambers I still dont think you'll be in any danger of pinging with pump gas due to the aluminum wicking off the heat
Has anybody got any tests on an internal combustion engine, with empirical evidence, quantifing the actual effects of this 'heat wicking aluminum'? 'Cause all I can find is people saying, "Aluminum conducts heat faster, so therefore, blah, blah, blah."
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Re: 452 vs 906 HEADS
[Re: LaRoy Engines]
#1521429
10/24/13 10:41 PM
10/24/13 10:41 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Quote:
Has anybody got any tests on an internal combustion engine, with empirical evidence, quantifing the actual effects of this 'heat wicking aluminum'? 'Cause all I can find is people saying, "Aluminum conducts heat faster, so therefore, blah, blah, blah."
Well maybe that is good enough as is. With the Stealth heads he'll have more SCR, less weight & highly likely have no danger of pinging & definitely go faster from all of that plus more flow. I have no empirical evidence as that takes edumacation  EDIT OK I will withdraw what I said about wicking off heat but very likely the OP can run a set of Stealths with his combo & wont have any pinging plus the other bennies
Last edited by RapidRobert; 10/24/13 10:52 PM.
live every 24 hour block of time like it's your last day on earth
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