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will aluminum heads make a difference on my motor?
#587862
01/19/10 07:15 PM
01/19/10 07:15 PM
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Joined: Jun 2009
Posts: 233
vashon island washington
hunterstroble
OP
enthusiast
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OP
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Posts: 233
vashon island washington
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I have a 440 in my challenger, i don't race it anymore, just cruise with the kid. I have a 440 with 11-1 compression, .505in .505 exh 290 duration isky solid lifter cam, 1.5.1 roller rockers, 452 heads with 2.14 and 1.81 stainless valves, bowl ported and other port work and a three angle valve grind. An m1 single plane intake and 850 holley with a proform hp center body. My question is will I gain anything with a set of eddy or 440 source heads. I don't want to increase my cam or carb because I like the drivabilty of the componation. Thanks.
1969 Dodge dart 500 stroker
1973 Dodge Challenger 440
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Re: will aluminum heads make a difference on my motor?
[Re: AndyF]
#587866
01/19/10 07:42 PM
01/19/10 07:42 PM
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Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
WILD BILL
Senior Member of the Junior Dragster Club
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Senior Member of the Junior Dragster Club
Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
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I noticed a big difference when I bolted on my Edy's OOTB but my old Iron heads were untouched. 
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Re: will aluminum heads make a difference on my motor?
[Re: dOrk !]
#587867
01/19/10 07:51 PM
01/19/10 07:51 PM
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Joined: Jun 2009
Posts: 233
vashon island washington
hunterstroble
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vashon island washington
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I use 92 octane at 36 degrees total timing, no detonation, i swapped to the thim sheet metal gaskets last summer and there were no detonation marks either. I'm just wondering by swapping heads if there will be 1000 dollars difference.
1969 Dodge dart 500 stroker
1973 Dodge Challenger 440
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Re: will aluminum heads make a difference on my motor?
[Re: AndyF]
#587869
01/19/10 07:55 PM
01/19/10 07:55 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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Hypothetical Q: If a person replaced a set of 452's w a set of eddies and the chamber/port dimentions were IDENTICAL on each (1) what would be the difference in performance (if any) and (2) With the aluminum conducting heat faster would that be what would be making this difference (if there's a difference)? and (3) if the eng (w the 452's) was at the ping limit with his current choice of fuel (and his current CR) if the SCR was was raised (w NO other changes) would he be able to run the same octane w no pinging? and (4) if so would there be a gain in power (w the higher CR/alum heads (which'd be wicking away heat)?
live every 24 hour block of time like it's your last day on earth
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Re: will aluminum heads make a difference on my motor?
[Re: hunterstroble]
#587870
01/19/10 10:08 PM
01/19/10 10:08 PM
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Joined: Jan 2003
Posts: 31,002
Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,002
Oregon
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Quote:
I use 92 octane at 36 degrees total timing, no detonation, i swapped to the thim sheet metal gaskets last summer and there were no detonation marks either. I'm just wondering by swapping heads if there will be 1000 dollars difference.
Depends how much money you have. If you're going hungry and the kids don't have shoes then spend the grand on something else. If you have a big toy budget then a set of Edelbrock heads is a logical investment. Better yet buy the Mopar version with the straight plugs so you don't have a hassle with the plug wires.
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Re: will aluminum heads make a difference on my motor?
[Re: RapidRobert]
#587873
01/20/10 12:53 AM
01/20/10 12:53 AM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
master
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master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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Quote:
Hypothetical Q: If a person replaced a set of 452's w a set of eddies and the chamber/port dimentions were IDENTICAL on each (1) what would be the difference in performance (if any) and (2) With the aluminum conducting heat faster would that be what would be making this difference (if there's a difference)? and (3) if the eng (w the 452's) was at the ping limit with his current choice of fuel (and his current CR) if the SCR was was raised (w NO other changes) would he be able to run the same octane w no pinging? and (4) if so would there be a gain in power (w the higher CR/alum heads (which'd be wicking away heat)?
The following are just my somewhat educated opinions. I am not a professional engine builder, just a hobbyist. with that said, I'll take a swing at these Q's:
1) IF everything else was the identical, and only the material was in question: none, if anything the iron heads might offer a very slight horsepower advantage, but aluminum weighs less, so your car gets lighter. Advantage Aluminum.
2) The difference would be that just as aluminum dicipates the heat, it also dicipates energy (this is why its good when used at main caps). Since it dicipates energy at a slightly higher rate than iron, the iron heads would create more energy inside the cylinder, hence, slightly more HP. (emphasis on SLIGHTLY)
3) depends on how much you raise the compression. because of the same pricipals noted @ #2, you can use slightly more static compression with aluminum. with that said, If I was the OP, I'd opt for the Eddy large chamber heads to break even, or slightly lower my compression (11:1 is too much for pump gas in my book, even with aluminum heads)
4)more compression generally = more power. but again, at 11:1 on pump gas, I would'nt look to raise it.
Hope that helps, let me know if you dissagree.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: will aluminum heads make a difference on my motor?
[Re: StealthWedge67]
#587875
01/20/10 02:48 AM
01/20/10 02:48 AM
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Joined: Jun 2009
Posts: 233
vashon island washington
hunterstroble
OP
enthusiast
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OP
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Joined: Jun 2009
Posts: 233
vashon island washington
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probobaly lucky, but my car runs really rich, my dad's car had the same combo before he went to a 500 and his did not ping either.
1969 Dodge dart 500 stroker
1973 Dodge Challenger 440
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Re: will aluminum heads make a difference on my motor?
[Re: hunterstroble]
#587876
01/20/10 03:44 AM
01/20/10 03:44 AM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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Quote:
I'm just wondering by swapping heads if there will be 1000 dollars difference.
No. Your worked over stock heads probably don't leave much on the table compared to OOTB eddys or stealths. Now drop 2000 dollars on a set of CNC ported stealths that flow 310-320cfm and there you'll see some difference!
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Re: will aluminum heads make a difference on my motor?
[Re: RapidRobert]
#587877
01/20/10 03:46 AM
01/20/10 03:46 AM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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Quote:
Hypothetical Q: If a person replaced a set of 452's w a set of eddies and the chamber/port dimentions were IDENTICAL on each (1) what would be the difference in performance (if any) and (2) With the aluminum conducting heat faster would that be what would be making this difference (if there's a difference)? and (3) if the eng (w the 452's) was at the ping limit with his current choice of fuel (and his current CR) if the SCR was was raised (w NO other changes) would he be able to run the same octane w no pinging? and (4) if so would there be a gain in power (w the higher CR/alum heads (which'd be wicking away heat)?
A while back someone on here posted a dyno comparasin from one of the hot rod mags of two chevy motors side by side. Built identically, identical heads except one was iron one was aluminum to test this alum vs iron theory. Results on the dyno, no difference between the two. So if you can up the SCR with the alum heads, it's only a win-win situation for you over the irons.
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Re: will aluminum heads make a difference on my motor?
[Re: hunterstroble]
#587878
01/20/10 09:35 AM
01/20/10 09:35 AM
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Joined: Mar 2008
Posts: 5,746
Ontario, Canada
Dodgem
master
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master
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
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This the cam SOLID .505 .028 290° 254° 108° .505 .028 290° 254 this cam is big enough to help reduce cylinder pressure below 4000 so goes a long way to reducing ping with an iron head. Not enough gain Edlebrock OOTB to spend $1450 IMHO and the Source heads will do nothing The source heads are a far inferior head to the Eddy OOTB they may come close CNC port to CNC port but still a Chinese crap shoot at best!! Now if your were bracket racing the extra 2 3 tenths an OOTB eddy would give means a lot on the street you will not feel it or feel very little
Last edited by Dodgem; 01/20/10 09:37 AM.
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Re: will aluminum heads make a difference on my motor?
[Re: Dodgem]
#587879
01/20/10 11:59 AM
01/20/10 11:59 AM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
master
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master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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If you just don't like stuff manufactured by a Chinese person, thats your deal. But to say Stealth heads are crap is just plain stupid. They flow nearly exactly what an Eddy head does, Hundreds of guys right here on this site are using them with little or no trouble, and at $500 less than a pair of Eddy's, there is just no denying the fact that they are perhaps the best bang for buck available for a Mopar big block on the market today. Personally, from a guy with a family and a limited hot-rod budget..... "THANK YOU BRANDON!!!"
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: will aluminum heads make a difference on my motor?
[Re: StealthWedge67]
#587881
01/20/10 02:33 PM
01/20/10 02:33 PM
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Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
WILD BILL
Senior Member of the Junior Dragster Club
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Senior Member of the Junior Dragster Club
Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
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GEnsrud, reread Dodgem's post. He didn't say they were crap. He said they were a "crap shoot" 
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