Factory Small Block Heads
- Thread starter 318willrun
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Just to be nitpicky, and I know you know this, besides never becoming an actual production car, it came a couple of decades after I talked to the guy trying to sell his slant six 62 Dodge. But I'm happy and sad to be reminded of what Chrysler might have been capable of. Chrysler has a great history of high performance and luxury, but now it's brand has degenerated into - a minivan. That's it!
At least they gave us several years of the Challengers, Chargers, and some cool pickups. Mopars will be around a long time.
Ram and Jeep will definitely carry on Chrysler hanging by a thread, Dodge is questionable after this electric car debacle.
Swinger 340
Well-Known Member
I have been running miss match heads ( "O" and "U") on my van for 35 years without any issues. Both are simular to the "X".
side track - what is your van? I kinda got a thing for vans... lol
Oh! Great! Time to move this to the Blue section. Van ****. LMAO!
4eighteener
Well-Known Member
Hey Krazykuda,No, they couldn't... If the head is within spec, they run it...
It's too hard to coordinate castings on both sides of the assembly line, they put on whatever fits... When you are running production lines, you have to throw them together as fast as you can... Especially with an engine factory that supplies multiple car plants... To quote a paint manager at Warren Truck, "I don't have time to finger f*ck every truck that goes through my shop... I have to do my best with the time I have with them on the line"...
It's too hard to track and separate castings in a factory... There are many issues to deal with...
If one machine goes down on the machine line, they will shut down that machine to repair it and run the machines in front of it and rack off the parts at the station just before the down one and put them aside... Then when that station goes back up, they keep running the complete line using currently loaded parts at the front of the line... Then if a machine at the front of the line goes down, they will then take the parts from they racked off from the first down machine and load them back on the line after the new down machine to keep the line going and parts coming off... Now those castings will make it to the assembly line weeks or months after the other castings in that batch that made it first time through... Then you have reworked parts and teardown parts from engines that were defective and torn down and the parts recycled... It's not a simple it goes from the back of the plant to the front in one swoop, there are hiccups on the way through...
So the machine lines build up banks of extra parts to fill in when their machine line goes down so the assembly line can keep running...
This is what machine lines have to do to keep the assembly line running... YOU HAVE TO KEEP THE ASSEMBLY LINE RUNNING!!!
If the executive managers at HQ see your assembly numbers are not what they should be, they make a call to the component plant Plant Managers and demand answers. Then the plant managers in the component plants chew out the area managers of the assembly line and machine lines responsible for not making their daily numbers... The **** rolls downhill... The execs at HQ get reports for production numbers every day and keep an eye on them... Every plant, whether it is a component plant or assembly plant has its daily production target that they are expected to meet and have to answer to the corporate exec's every day if they are short...
And god help the component plant if they can't supply the assembly plants and shut them down... There will be hell to pay...
A typical car plant runs 70 cars per hour off their assembly line... That's a car coming off the line every 51.4 seconds... Now think about if the assembly line goes down/stops for 15 minutes... You are talking 18 cars short... Now let's say that each car is worth $30k, 30k x 18 = $540.000, that's half a million dollars in product that they are short now... And what if you are making trucks worth $70k or more, that's over one million dollars for 15 minutes of downtime... That is why you have to keep the production line running....
So there's not enough time and manpower to finger f*ck every head casting to both sides of the assembly line to make them match... You throw on whatever you have on that pallet on that side of the line that meets specifications...
You were fortunate to have seen, and worked through that era! All the automotive books seem to agree that is the era when the Japanese automobile industry got their foot in the door here in America.
Whereas the big 3 would never shut down the line to correct a problem, in Japanese manufacturing, every employee had the responsibility to shut down the line if they saw a problem.
They figured a defective car getting out cost them more with warranty work, a dissatisfied customer base that would no longer buy a future product from them, and also telling their friends and families not to buy that product. It's called customer satisfaction.
Sometimes a little finger f*ck is all it takes
Head castings didn't wreck the American auto industry. And the cars that people want, love, and pay huge to buy today are the cars that were made yesteryear. American cars. The cars that Americans had pride in for years. Cars of statement. Not cars of compliance. I said enough... back to heads!!
4eighteener
Well-Known Member
I assumed the head thread was over when it started talking about van ****.
middleagecrisis
Well-Known Member
I want to keep this thread alive and about its original purpose, so I’ll bring up my J heads. I have a set of fresh 915 J heads with 202/160 valves that I’ve pocket ported and cleaned up the intake and exhaust runners. i’ve ported the Edelbrock torker manifold internally and will be using a Oregon grind, 1173 I believe.I’m anxious to see how it’s all going to perform together!Head castings didn't wreck the American auto industry. And the cars that people want, love, and pay huge to buy today are the cars that were made yesteryear. American cars. The cars that Americans had pride in for years. Cars of statement. Not cars of compliance. I said enough... back to heads!!
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That is not right.
4eighteener
Well-Known Member
I believe you are both right.
Although open chamber heads had been used decades before the pollution era, I think RRR was referring to chrysler ditching the closed chamber design heads in favor of the open chamber heads at the start of the pollution era as an attempt to lower the compression ratio and hence lower NOx output. I should say I'll fated attempt, aa NOx went down, so the carbon monoxide and hydrocarbon levels went up and performance went down.
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I am pretty sure that when the open chamber X head came into play the 340 was making about 10.5 to 1.
I would not call that a low emission attempt.
I would not call that a low emission attempt.
Yes it is. That’s how Chrysler met emissions.
They also explained how to correct it. If you correct it, the open chamber in those heads is as fast as the much ballyhooed magnum chamber.
Exactly correct. This is what happens when lawyers who don’t know anything write laws.
TT5.9mag
Two atmospheres are better than one
Wow handsome and has a vocabulary like that? How does she keep her hands off of you?
Wow handsome and has a vocabulary like that? How does she keep her hands off of you?
I have to limit her. I sleep in the back bedroom with the dogs so I get some rest!
4eighteener
Well-Known Member
You are right the 340 never changed (assuming X and J are relatively the same) their cylinder heads between pre-emission, or post emissions.but they did knock down the compression height with different pistons in the emissions era 340's '72/'73.
The lower compression knocked down the NOx. After that, they incorporated a egr system to knock down the carbon monoxide and hydrocarbons. Then they went to closed chambers and small valve to increase swirl in an attempt to increase burn efficiency with a leaner mixture, and lastly changing the magnum block to a lower deck height to optimize quench.
What cylinder heads were a closed chamber for the 340? X or J heads?
4eighteener
Well-Known Member
Neither
Did I miss understand you as I thought you said that they went to a closed chamber head and smaller Valves to help the swirl affect for better burn efficiency
4eighteener
Well-Known Member
Yes, in later engines, like the 302 heads as an example for the 318.
Not factory in a 340 motor unless you go aftermarket
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