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340 Edelbrock heads or 340 X heads
#294888
04/21/09 10:46 AM
04/21/09 10:46 AM
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Joined: Jun 2007
Posts: 1,169
clarks summit pa
73cuda340
OP
super stock
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OP
super stock
Joined: Jun 2007
Posts: 1,169
clarks summit pa
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What do you guys think would be a better choice for my car, the edelbrocks or the x heads? I currently have an LD 340 intake, Comp XE268 cam, Hooker competition headers with 2.5" exhaust, thermoquad carburetor and low compression 340. Would the power gained by the Edelbrock's be worth the $1400 for the heads? I'm on a tight budget so I don't want to spend the money if the gain wont be worthwhile. I dont have either set of heads right now so I'll be getting a set of either. Im trying to get this car to go 12's if possible.
1973 Cuda 528 all aluminum Hemi, 4 speed, 3.23 Sure-Grip,
(JA5) Silver Frost Metallic
1973 Challenger Rallye 340
1985 W150 Power Ram prospector
1986 Camaro IROC-Z 305 tpi
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Re: 340 Edelbrock heads or 340 X heads
[Re: 73cuda340]
#294891
04/21/09 11:05 AM
04/21/09 11:05 AM
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Joined: Jan 2003
Posts: 8,022
Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,022
Tulsa OK
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By the time you buy a set of X heads and get them machined to be race ready your going to be withing range of the edelbrock heads IMO. I would go with the Edelbrock heads as they are a nice piece. Plus you will have more room for potential ET after porting etc.
You could run 12s easily with either cylinder head.
68 Barracuda Formula S 340
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Re: 340 Edelbrock heads or 340 X heads
[Re: 73cuda340]
#294892
04/21/09 11:08 AM
04/21/09 11:08 AM
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Joined: Jan 2003
Posts: 11,711
Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,711
Portage,michigan
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Quote:
What do you guys think would be a better choice for my car, the edelbrocks or the x heads? I currently have an LD 340 intake, Comp XE268 cam, Hooker competition headers with 2.5" exhaust, thermoquad carburetor and low compression 340. Would the power gained by the Edelbrock's be worth the $1400 for the heads? I'm on a tight budget so I don't want to spend the money if the gain wont be worthwhile. I dont have either set of heads right now so I'll be getting a set of either. Im trying to get this car to go 12's if possible.
Years ago, i had my original 340 motor in my duster. the shortblock was untouched as it came from the factory.So, 10.5 compression.
I made the following changes to it.
230/238 hughes hydralic cam
airgap, 750/3310 vacuum secondary holley carb. 1 5/8 tube cheapie headers.
i had bone stock 2.02 j heads on it.
I took bone stock out of the box eddie heads and bolted them on the car, and went to the track.
The car , on the first outing, picked up 3.5 tenths over its previious best before swapping the eddies on. Subsequent tuning and testing resulted in it picking up a total of 4 tenths over factory 2.02 heads.
With the 10 inch coan convertor i had, and the 4.10 gears i was running, the car had previously went a best of exactly 13 flat.
With the eddies on it, it clipped off 12.60's consistantly.
I think had i stepped up the smallish cam, it would have run even better, also maybe touching up the eddies valve job, etc.
All this time i ran the stock stamped rockers, pushrods, etc.
At that point i swapped out the factory motor and went to a 416..............
your results might vary...
Hope this info helps  
Last edited by B3422W5; 04/21/09 11:10 AM.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8
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Re: 340 Edelbrock heads or 340 X heads
[Re: 73cuda340]
#294893
04/21/09 11:21 AM
04/21/09 11:21 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
What do you guys think would be a better choice for my car, the edelbrocks or the x heads? I currently have an LD 340 intake, Comp XE268 cam, Hooker competition headers with 2.5" exhaust, thermoquad carburetor and low compression 340. Would the power gained by the Edelbrock's be worth the $1400 for the heads? I'm on a tight budget so I don't want to spend the money if the gain wont be worthwhile. I dont have either set of heads right now so I'll be getting a set of either. Im trying to get this car to go 12's if possible.
on a budget? get the enginequest "Iron Rams" hughes is selling in the new products section for $800. get the 318B's with the LA intake pattern.
https://board.moparts.org/ubbthreads/show...e=0#Post5090712
can use any chevy rocker or stock magnum rockers (~$80/set new), need to measure and get pushrods (~$50 from summit), and need magnum head bolts (~$20).
LA valve covers work on them. any X head that needs valves/guides/springs/seats is going to be more than $800 to build up, and don't flow as good as the EQ's....
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: 340 Edelbrock heads or 340 X heads
[Re: patrick]
#294894
04/21/09 09:30 PM
04/21/09 09:30 PM
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Joined: Jun 2007
Posts: 1,169
clarks summit pa
73cuda340
OP
super stock
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OP
super stock
Joined: Jun 2007
Posts: 1,169
clarks summit pa
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Has anybody tested the two heads to see the gains?
1973 Cuda 528 all aluminum Hemi, 4 speed, 3.23 Sure-Grip,
(JA5) Silver Frost Metallic
1973 Challenger Rallye 340
1985 W150 Power Ram prospector
1986 Camaro IROC-Z 305 tpi
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Re: 340 Edelbrock heads or 340 X heads
[Re: 73cuda340]
#294895
04/21/09 09:41 PM
04/21/09 09:41 PM
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Joined: Jan 2003
Posts: 6,266
Renton Washington
Triple Threat
master
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master
Joined: Jan 2003
Posts: 6,266
Renton Washington
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Quote:
Has anybody tested the two heads to see the gains?
Here is my experience
Low compression 340, similar camshaft to yours, Old Offy intake, 2.02 valve 915 casting Iron heads (basically the same exact thing as an "X" head,)2800 converter, 3.91 gears and a 26" tire The car went 13.80's consistently.
WITH NO OTHER CHANGES I replaced the iron heads and reassembled the car with 63 cc edelbrocks. First day to the track the car went 12.81@106mph. Took a full second off my ET's. You have to understand I gained about 1 point in compression doing this swap as well going from 8.5:1 to 9.5:1. The edelbrocks have a smaller CC combustion chamber, so that was likely part of the reason for the power increase.
Cliff Notes :
My car went 13.80's @99mph
I put on a set of edelbrocks and the car went 12.80's @106mph
I was very happy with my purchase
You should get a set too.
-Dustin
67 Dart, 9 second, 392" G3 Hemi
68 Barracuda 340 F/SA
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Re: 340 Edelbrock heads or 340 X heads
[Re: 69Cuda340S]
#294897
04/21/09 10:32 PM
04/21/09 10:32 PM
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Joined: Nov 2008
Posts: 660
San Diego
formula S
mopar
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mopar
Joined: Nov 2008
Posts: 660
San Diego
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Quote:
Go with the Edelbrock closed chamber 360 head. That will get the compression up and the Edelbrocks flow a lot more then x heads. It is advised that you have the valve job and valve guides looked over by a machine shop prior to installing.
 
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Re: 340 Edelbrock heads or 340 X heads
[Re: 73cuda340]
#294899
04/22/09 06:57 AM
04/22/09 06:57 AM
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Joined: Feb 2009
Posts: 1,532
off the grid
340B5
pro stock
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pro stock
Joined: Feb 2009
Posts: 1,532
off the grid
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I use home ported J heads and have run 12.02 in bad air (29.5) on a windy day ~~~~~~I have $700 in them. You probably need a little more cam to go deep into the 12's.
Yeah, it's got a smallblock.
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Re: 340 Edelbrock heads or 340 X heads
[Re: 340B5]
#294900
04/22/09 09:39 AM
04/22/09 09:39 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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lemme repeat, hughes "IRON RAMS" flow 95% of an eddie head for less than 5/8 the cost, come assembled with hughes 1110 springs (120lb seat, 300lb@.5" lift, 360 lb/in rate). here's from hughes website (I cropped so they're side by side):  nice apples to apples comparison since these are all done at the same shop on the same bench. the 1.92" valve enginequest heads flow nearly identical to the eddies until .5" where they give up 10cfm. X heads would flow pretty much the same as the '576 heads in the chart. using stock mag rockers would up the lift on your cam to .509/512" lift. stock magnum rockers are $9.69/cyl from rockauto.com, or you can use any aftermarket chevy/amc roller rocker...scorpion performace rollers (made in florida) are $200-250 for amc apps on ebay order the 318B's, LA intake bolts up, LA valve covers & headers bolt right up to mag heads too. if the MP 7.625" conversion pushrods are too short (has been the case for some people), summit sells 7.65" pushrods for $63. the comp lifters are amc style with pushrod oiling provisions, so your total cost (using OEM rockers) is about $950....or less than $1100 using some pretty nice roller rockers.
Last edited by patrick; 04/22/09 09:57 AM.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: 340 Edelbrock heads or 340 X heads
[Re: 73cuda340]
#294902
04/22/09 11:55 AM
04/22/09 11:55 AM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
Has anybody tested the two heads to see the gains?
I have tested them with the seat of my pants. The Edelbrock heads made more horsepower for sure and made my car handle better than my old 2.02 iron heads. Best thing since sliced bread for SB mopars. 
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Re: 340 Edelbrock heads or 340 X heads
[Re: Valiant_Showoff]
#294904
05/12/09 07:20 PM
05/12/09 07:20 PM
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Joined: Jun 2007
Posts: 1,169
clarks summit pa
73cuda340
OP
super stock
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OP
super stock
Joined: Jun 2007
Posts: 1,169
clarks summit pa
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I bought a set of ported J heads at carlisle for $650. Fully rebuilt and it looks like they might have been milled. Supposedly flow more than Edelbrocks out of the box, according to the guy. Well see how it goes.
1973 Cuda 528 all aluminum Hemi, 4 speed, 3.23 Sure-Grip,
(JA5) Silver Frost Metallic
1973 Challenger Rallye 340
1985 W150 Power Ram prospector
1986 Camaro IROC-Z 305 tpi
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Re: 340 Edelbrock heads or 340 X heads
[Re: 73cuda340]
#294905
05/12/09 07:36 PM
05/12/09 07:36 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Edelbrocks.. with just a "mild" port job,mine perform extremly well probably never go back to iron heads..
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Re: 340 Edelbrock heads or 340 X heads
#294906
05/12/09 08:43 PM
05/12/09 08:43 PM
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Joined: Nov 2004
Posts: 2,495
Oregon City, OR
Baxter61
top fuel
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top fuel
Joined: Nov 2004
Posts: 2,495
Oregon City, OR
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Id say if your limiting yourself between the edelbrocks and the x heads, you really need to examine how tight your budget is. Its what, $1200 for new eddys then maybe another $200 to have them checked out. So given they dont need to be fixed, your $1400 in them. You can be less that $700 into a set of irons and you will can get into the 12's fairly easy.
No, I dont think that iron heads are as good as Eddy's, and if he goes with something other than an x-head you can save some more coin on the castings. But when the budget gets really tight, $200 to $400 here or there can become pretty significant and if its the difference between going racing and sitting at home waiting for the extra cash to buy the eddy's, Id rather go racing.
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