mderoy340
Well-Known Member
Here's a good read for anyone searching the yards. Changes by year reference.
http://www.mopar1.us/sort.html
http://www.mopar1.us/sort.html
5.9 Magnum exhaust/intake combo help
- Thread starter 67CudaBob
- Start date
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mderoy340
Well-Known Member
The Dakota 5.9 R/T was a truck package that only came in the Club Cab IIRC. Stock 5.9, cam changes on the Magnums during those years were to meet the tougher EPA rules as they went into effect.
I have a 1999 Dakota R/T. Man I wish it had 275 hp!
DionR
Well-Known Member
You mentioned earlier that would be a bit before you got one apart, I understand. That's why I didn't jab you about a timeline.
That's all I wanted.
I don't see this as any huge deal, regardless of who is right or wrong. It really doesn't make a hill of beans.
On the other hand, as an example of something I felt is a little more important, I was at one time fairly vocal about whether or not Charger/300/Magnum wheels were a 5x4.5 or 5x115mm bolt pattern. I have posted pictures of a bolt pattern checking tool that fit better at 4.5" rather than 115mm, and found part listings that showed 4.5", and theorized as to how it could have happened to get into the literature, but after all the looking I did and measuring wheels where I could and listening to the people that said they didn't fit when they tried it, I didn't have enough ammo to defend it like I would want. I still have (in my opinion) enough to satisfy myself, but when I look at the consequences to someone else if I am wrong, I decided it wasn't worth championing it any more so I dropped out of the discussion.
It doesn't matter what I say someone has for a valve size, they have what they have. On the other hand, it matters (to me) if someone believes something I said about Charger wheels fitting on a Duster and wrecked their car, if I were wrong.
All that to say, I don't see this as an issue to fight about.
magnummopar
Well-Known Member
So, whether I am right or wrong, lets assume i am wrong, that with either the .397" or .410" cams listed as 5.9 cams between 96-03 as biggest possible, would that not be an even better reason to change it to at least .450"? I think that was part of OP's original inquiry. The difference between the .397" cam and a .450" is huge, what the 5.9 begs for with stock heads. I would say .525" but didnt sound like OP wants to deal with springs. $.02
I bought this RT new in 1999. The horsepower rating on a RT was 250. That was due to a bigger exhaust. Everything else as far as the motor goes is the same as a regular 5.9 Magnum. Same heads etc... No RT heads- and it had the same cam as a regular 5.9. The RT did have a different suspension and different wheels.
RT heads were Mopar Performance and will have RT stamped on them. Never put on a RT from the factory. Aftermarket only. Also its my understanding all factory Magnum heads 5.2 and 5.9 had 1.92 intake valves. Now I could be wrong on that but all the ones I have seen are 1.92. Also I believe the 5.2 ran a bigger cam than the 5.9.
Looks exactly like my trucky ^^^^
Yep, both club and regular cabs.
There was also a somewhat poorly documented "R/T appearance package" for non 5.9 Dakotas that included the R/T 17" wheels, fender flares and monochrome bumpers.
I've seen more than one of those.
I remember reading up before I bought my 2000 R/T that the engine was simply a "regular" 5.9 and even was touted as being 8.5:1 compression to run on regular gas.
I've never heard a claim of 275 HP before this thread.
There was also a somewhat poorly documented "R/T appearance package" for non 5.9 Dakotas that included the R/T 17" wheels, fender flares and monochrome bumpers.
I've seen more than one of those.
I remember reading up before I bought my 2000 R/T that the engine was simply a "regular" 5.9 and even was touted as being 8.5:1 compression to run on regular gas.
I've never heard a claim of 275 HP before this thread.
DionR
Well-Known Member
Don't think anyone is confused on that. At least that I am aware of.
BTW, those are what I am running on my Duster. :cheers:
That is what we have been discussing above. There is documentation to support a 1.88 valve in the 5.9, but at the same time, the same guy that wrote the Magnum Performance book (Larry Shepard) is also quotes as saying the 5.2 and 5.9 use the same head. Lot's of confusion. I see a logical progression as to how the documentation could have been messed up, but my theory doesn't fix the issue. So, until magnummopar get's the time to take one apart, it's an "agree to disagree" point.
DionR
Well-Known Member
I can't add anything, other than to say that you have the experience to say what to run, so I defer to your knowledge on that subject.
DionR
Well-Known Member
magnummopar
Well-Known Member
Just to be clear, I never said RT heads, I said cam was larger and pcm was different and that they put the 1.92 intake heads on the RT and that not all 5.9 have 1.92, some are 1.88. All RT I have taken apart had 1.92".
I am not willing to argue this point as its not helping the OP, If I run across documentation about the 270HP I will post in separate place, personally, I dont care. I already posted FSM quoting the 1.88 valve but nobody believes it anyway so its pointless.
I need to learn to keep my opinions to myself.
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