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DG
Dodge Dakota
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8/20/2006
20:37:25
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 Subject: 4.7 header ?
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I was just wanted to know if the 4.7 has studs already in the block from the old manifolds,and new shorty headers slide right over them with new nuts, or do the new headers come with new bolts? I am talking about gibson shortys. Thanks
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josh
Dodge Dakota
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8/21/2006
13:08:45
|  RE: 4.7 header ?
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the stock manifolds on the 4.7 dont have studs, they have bolts and the gibson headers has a bolt kit with it. they are somewhat difficult to install, just dont twist the stock y-pipe of you will have an exhaust leak. found out the hard way, but it is worth it to do it yourself and learn what you can and cant do. that is my .02
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trucky
Dodge Dakota
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8/22/2006
05:42:26
| RE: 4.7 header ?
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how are the headers on the 4.7, and what metal did u get
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01Motorsport
Dodge Dakota
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8/22/2006
10:11:11
| RE: 4.7 header ?
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The factory exhaust manifolds were designed to flow within 2 percent of headers. Money is better spent downstream on the exhaust, especially trashing the factory y-pipe with its 1 1/2" inlets. Magnaflow and other companies make mandrel-bent y-pipes, or go to true duals.
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trucky
Dodge Dakota
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8/30/2006
17:58:14
| RE: 4.7 header ?
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what do i do just replace the stock y-pipe with the new one or is it more complicated
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GraphiteDak
GenIII
8/31/2006
02:51:17
| RE: 4.7 header ?
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I am still wanting to try LONG tube headers. The short tubes probably don't make much diff over stock.
But long tubes have GOT TO scavange some gases that the STOCK manifold wont.
Some people have said the stock 4.7 manifolds are no where as restrictive as the 318 ones.
Maybe later in the fall when I have more time I may build some headers from scratch. I have an extra 4.7 engine to at least mock up the exhaust flange to the head first.
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trucky
Dodge Dakota
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8/31/2006
07:57:05
| RE: 4.7 header ?
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you and your crazy projects...i've seen ur webpage...you're an inspiration
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GraphiteDak
GenIII
9/04/2006
15:55:43
| RE: 4.7 header ?
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"Crazy Projects"
LOL! Thanks dude!
I have been dreaming up a really cool intake manifold for the 4.7 to unleash both low RPM's AND high RPM's.
IF I ever get brave enough.... :p
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trucky
Dodge Dakota
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9/04/2006
16:07:56
| RE: 4.7 header ?
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hey i have a 4.7...care to share? : o ) im in the middle of trying to relocate my intake (like you did) to get some ram air action. or at least more than that little hole by the headlight that does nothing. drop me a line oubobcats27@gmail.com
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Josh
Dodge Dakota
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9/04/2006
19:38:36
| RE: 4.7 header ?
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I hav A 03 dakota guaud cab 4.7 50.000 miles Whoever said the short gibson headers dont work Are Wrong almost feels like its got a turbo.My headers were my best upgrade for the money bottom line they Do work.
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GraphiteDak
GenIII
9/04/2006
22:22:50
| RE: 4.7 header ?
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Trucky, I actually have my intake going BACK to the stock hole in the fender. But I sealed it to the fender so no under hood air gets sucked in too.
If you want to RAM AIR it, I assume you are going through the hood or something?
Josh. That's awesome. I have the feeling that 99% of the peoplke who say headers would not provide any gain on a 4.7, doesn't even have one :p
I couldn't see how they WOULDN'T give something. They defenitely would not hurt. Full length would be great too.
People also think 2 1/2" true duals, with NO crossover would KILL torque.
Not even :) I just towed way over stock rating and the engine was a torque monster at 3200 RPM's.
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trucky
Dodge Dakota
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9/07/2006
02:45:19
| RE: 4.7 header ?
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actually i have no idea what im going to do... i have the K&N kit setup right now... i've heard peeple use chainsaw hose to extend it? maybe i can put that on my k&n tube and extend the filter to where i want it? i dont even know where to start.
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Justme
Dodge Dakota
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9/07/2006
07:59:57
| RE: 4.7 header ?
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Who can say that these stock manifolds flow 2% Less vs. Headers?
http://www.cardomain.com/ride/813977/3
I kinda find that hard to believe.
Jimbo.
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Josh
Dodge Dakota
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9/08/2006
21:19:26
| RE: 4.7 header ?
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The intakes that were romoved from my 4.7 were a stait iron tube with four holes not possible itonly flows 2 percent lesss then the gibsons that replaced them NO WAY..........PERIOD!
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GraphiteDak
GenIII
9/09/2006
00:05:06
| RE: 4.7 header ?
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Yeah I think that always sounded a little odd that headers don't flow (any more than 2%) over stock manifolds. In some ways they may be BETTER than the older 318 style manifolds. But again all 4 outlets blow into a single tube. I don't see how it would do a good SCAVANGING effect like good headers do.
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Kowalski
GenIII
9/09/2006
07:45:38
| RE: 4.7 header ?
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Not sure where that would be much different than "shorty" headers that are typical for the 4.7. For the best scavaging, we need tuned headers of equal length - old long tube style headers give you that. The shorty style does not - just a little further downstream, they do the same thing the stock manifolds do - dump into a single tube...
You're right of course - shorty headers just aren't good headers.
Lead, follow, or get out of the way
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Josh
Dodge Dakota
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9/09/2006
14:09:51
| RE: 4.7 header ?
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If you dont have headers installed and see for yourself than why voice a opinion.It gave me more power than the superchip and the cool intake combined wich were installed first.I installed the side swept gibson exhaust also at the same time but with the stock Y pipe still in place i cant see were the muffler and little bit of gibson pipe made that big of a difference I feel if i woulda just installed the gibson exhaust without the headers the results would not of been even close to what i have now.I will find a nice Y very soon and it will be complete .But i do not expect any more gain with the Y pipe as i have now.The headers are also wrapped for the heat and what not but it rocks cold or warm so the wrap didnt make a difference i guess.
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Kowalski
GenIII
9/09/2006
15:01:36
| RE: 4.7 header ?
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Did you dyno to see what if any real power was gained with your exhaust changes ? You opinion doesn't seem to be based on good science; claiming you have more power due to the headers when more than one thing was changed, and saying that you don't expect any more from a change in the y-pipe when its been well documented here in the past that that is where our biggest exhaust restriction is. Josh, we're all free to post on anything we like here, I'm as entitled to my opinion (and that's all it is, from both of us, unless you've dynoed) as anyone.
I'd like to hear from anyone who's actually dynoed the gains from the header swap alone; or a header swap with other exhaust mods for the 4.7. That would help weed out the claims of gains people think they get from dropping some $$$ and getting a more agressive exhaust tone, from what the actual gains are to be had.
Lead, follow, or get out of the way
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Josh
Dodge Dakota
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9/09/2006
16:51:30
| RE: 4.7 header ?
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I dont need a dyno to tell me what i got and I would say the opinion from the guy who actually bought them and installed them is a little more worthy then a few guys that wont spend the money on them and just say no way they dont work do to science?to convince themselfs cause they already now they will never purchase or bye them.I was not on a dyno with it but heres a story my buddie out at work got a full size chevy silverado 300 hp stock I let him drive my Dakota he was amazed.He told me his chevy would not be able to keep up and this is commin from a bragging man who never thout a midsize truck would beet his Chevy.I live in michigan detroit area come on over ill prove it or pay for your trip if I cant.P.S Thanks for your OPINION Follow or get out of the way cause you Will Never LEAD. HEHE....
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trucky
Dodge Dakota
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9/09/2006
19:00:53
| RE: 4.7 header ?
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I'm sorry I couldn't follow that last reply. there was too many much grahm-atticul air-ors.
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Josh
Dodge Dakota
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9/10/2006
09:10:00
|  RE: 4.7 header ?
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I'm sorry, I just realized how dumb that sounded. Don't know how I could have thought this mod is proven to be so great by comparing it to a 300 hp motor in a much heavier truck. That makes no sense; now that I think about it. I put so much time, effort and money into this that it just has to work though - and I'm all tapped out now, so replacing the restrictive y-pipe couldn't help further. Anyone like to come half way across the country to race me though ? I had my mother help with the spelling so you could understand me this time.
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