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Re: OE 1969 340 X heads vs aftermarket aluminum heads. [Re: cudaman1969] #2387391
10/14/17 04:27 PM
10/14/17 04:27 PM
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Posts: 2,363
Cotati, CA
Dave Hall Offline
top fuel
Dave Hall  Offline
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Cotati, CA
I think the guys running in the heads up E final at Indy both have aluminum heads. Yeah, 10.00 is flyin' in D! If heat makes more power why do guys ice engines to go faster?

Re: OE 1969 340 X heads vs aftermarket aluminum heads. [Re: Dave Hall] #2387463
10/14/17 07:49 PM
10/14/17 07:49 PM
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fredericksburg,va
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cudaman1969 Offline
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fredericksburg,va
Originally Posted By Dave Hall
I think the guys running in the heads up E final at Indy both have aluminum heads. Yeah, 10.00 is flyin' in D! If heat makes more power why do guys ice engines to go faster?

Cool that cast iron skillet intake, I'll be using the LD340

Re: OE 1969 340 X heads vs aftermarket aluminum heads. [Re: Rhinodart] #2387496
10/14/17 10:25 PM
10/14/17 10:25 PM
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Posts: 3,886
Lost and Spaced
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bboogieart Offline
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Originally Posted By Rhinodart
lighten up Francis...

haha
Nice Stripes reference.
Also good advice.


I have mechanical Aptitude.
I can screw up anything.
Re: OE 1969 340 X heads vs aftermarket aluminum heads. [Re: Barrelhouse] #2387640
10/15/17 10:46 AM
10/15/17 10:46 AM
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Abilene, Texas
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fastmark Offline
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Ok..I have a question for you stocker guys about the alum Edelbrock heads. I went by Summit racing on the way back from the races at Dallas yesterday and laid my eyes on the Edelbrock heads. The ports look very restrictive to me. It looks like they are made to port and I can’t see how they flow more than stock heads right out of the box. Now I could not see the area right under the valve which is the most important. Any feedback is appreciated. I’m sure they have not allowed porting in stock yet.

Re: OE 1969 340 X heads vs aftermarket aluminum heads. [Re: fastmark] #2387664
10/15/17 11:33 AM
10/15/17 11:33 AM
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Posts: 2,363
Cotati, CA
Dave Hall Offline
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I don't race in Stock but it was posted here that the Edelbrock's are factored 3hp lower than the iron heads.

Re: OE 1969 340 X heads vs aftermarket aluminum heads. [Re: Dave Hall] #2387736
10/15/17 01:57 PM
10/15/17 01:57 PM
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Bend,OR USA
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Cab_Burge Offline
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Bend,OR USA
Edlebrock makes several different part numbers and casting of their aluminum heads for the LA motors, only one is NHRA legal scope
The original X and 915 J, O, and U heads are very restrictive also, hence the acid porting back in the day whistling shruggy
I raced stock up to 1988, I later helped two different SO CA NHRA SB 340 racers, one held the E/SA record for two years and later set the C/SA record with a 1970 T/A Challenger, he bought every stock looking X and J head he could find and then had them flowed to get the best heads for his program shruggy He swap heads like I use to swap tires work My message is not all heads flow and perform the same, OEM, stock or otherwise whistling

Last edited by Cab_Burge; 10/15/17 01:59 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: OE 1969 340 X heads vs aftermarket aluminum heads. [Re: Barrelhouse] #2387754
10/15/17 03:22 PM
10/15/17 03:22 PM
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las vegas
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stock heads are controlled by the CC of the port. To make the eddy head legal in stock the valves have to be changed from 11/32 stem to 3/8 stem..


Tony

70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
Re: OE 1969 340 X heads vs aftermarket aluminum heads. [Re: Barrelhouse] #2387758
10/15/17 03:32 PM
10/15/17 03:32 PM
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Posts: 8,192
fredericksburg,va
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cudaman1969 Offline
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E, Stock heads.. They made it as close to stock as possible. One head fits all. Just like their BB E head, it starts out closed chamber and small valve to fir those early 60s heads, 361-383-413-426 then a lot of work to make them like a 906. This means one is allowed to "machine" it to open up the chamber and big ex valve, porting in a sense, but still must maintain same CC, combustion chamber and ports. Now they allow any valve job and look the other way untill you stir up to much dust, but then you get a HP adjustment. High dollar game to play, better have a big wallet or the smarts before jumping in. My top piston ring will cost me $1400 (to play big league). So anyway, the stock heads are drying up so something had to take there place.
Now they let us run the LD 340 intake (Eldebrock, with factory part number) :-) even though none came on a stock engine from the factory, politics! Chevy-Ford guys are crying the blues!

Re: OE 1969 340 X heads vs aftermarket aluminum heads. [Re: Barrelhouse] #2387783
10/15/17 04:34 PM
10/15/17 04:34 PM
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1 Offline
Too Many Posts
Challenger 1  Offline
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Posts: 28,312
Cincinnati, Ohio
Originally Posted By Barrelhouse
Im having my 340 totally rebuilt my engine builder says that it would be a good idea to change my x heads to aluminum heads for better performance and lighter weight. What do you guys here on Moparts think is it a good idea and what are the best heads to use, thanks.


I have had good luck with edlebrock heads on my 340 and 440. Both got out of the box eddie heads and have ran great with no problems. My 340 is 10 years old now and has been driven 30K+ miles since then. I beat the crap out of the motor 3 different times/years out at Bonnelville running the motor at hi rpms for long periods of time.(many miles at a time and you can't hold it WFO but close...if you got the balls and motor) After those beatings it blew out the mufflers but the motor is still going strong. I drove it last night.

As soon as I backed out of the driveway after the rebuild and put it in first gear I could tell I had more ponies and a better handling car that was lighter. It took off like never before! The pistons were lighter too than the early hi compression pistons that were in there. I did not re balance the motor.

I used KB243 pistons on stock rods, CC the motor and it has 10.4-1 compression with open chamber 340 eddie heads made for the hi compression pistons. It runs great on 91 octane gasoline. twocents I built the motor.




Re: OE 1969 340 X heads vs aftermarket aluminum heads. [Re: Rhinodart] #2388355
10/16/17 08:22 PM
10/16/17 08:22 PM
Joined: Jan 2003
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dogdays Offline
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Heck no, steel is not a generic term, at least not a generic term for cast iron. Ask any foundryman or metallurgist or welder, for that matter. They have different properties - machinability, weldability, ductility, castability, for starters.

R.

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