I have a 73 Duster with a 318-auto....exhaust manifold is cracked so I need to replace it....I have already have a set of magnum manifolds from a dakota, would they fit??? I like the idea of free or I have thought of the cheapo summit headers...I am VERY low or no budget or the wife will force the sell....lets hear some advice yall

I put magnum manifolds on my 69 dart, they fit great. actually dumped in the right place, better than any other manifolds. didn't need oil filter adapter. I had to shorten trans dipstick bracket a little. now the bad news, I have manual steering box, manual valve body-no kick down linkage, floor shifter-no shift linkage.

I wonder if they will fit with PS and my kickdown BS???

No brainer there! Are these the early 92/93 ones with the ~2&5/16 outlets or the later ones with 1&7/8 outlets? big difference in performance and their value. I dont think with headers you would like the cost/addit'l parts needed/fitment headaches

Will the dakota magnum manifolds fit? They dump pretty far back, especially on the driver side. I know on the magnum swap I did on my jeep, the manifolds dumped right into the firewall so I had to do a bit of clearancing.

the 67 coronet i got with a 360 in it had magnum manifolds on it i'm pretty sure.

i redid the whole exhaust and went with some headers...but the manifolds did fit, i have power steering too...

There is also a special Jeep Magnum exhaust manifold, different from the Ram/Dakota design.

FWIW I sold my 5.2 magnum mani's of my 95 a while back. The guy the bought them wanted them for his 340 swinger. When I asked if they fit, he said like a glove and they are much better than the stock 340 mani's.

The placebo effect. IIRC the 340 manifolds and the Mag manifolds were within a few hp of each other when tested back-to-back.

R.

I remember that article. All of them, including the low po stuff, we're right about the same. Not worth the money IMO to buy one vessels the other when headers are so much better bang for the same buck

The problem I see is that the early (92/early 93) mag manis are ~2&5/16 outlets and are very nice pieces whereas the later ones are 1&7/8 which is the dia of one header pri tube on my last BB. yes they would fit (that is important!) and would be fine for a DD 318. the very best manifold combo is a 68-70 340 HP pass iron manifold and an early mag dr side manifold (what I have on the stock car).

IIRC the engine used was fairly mild and the exhaust may not really matter at that level.

Don't waste your time with the manifolds.

My 5.9 Duster went from 14.2 to 13.0 with a swap from manifolds to headers.

Will not fit on the drivers side with power steering.

I've heard this several times about the outlets being much smaller on the later year magnums. Any idea why they did this? And can the later ones be opened up to the large size or is the casting totally different?

The 340 manifolds were probably designed for high flow at high rpm and wide open throttle.

The official Chrysler literature from 1992 and 1994 describe the new design exhaust manifolds as "equal flow" ports.

Since both years Magnum V8s had egr systems those model years,
i suspect Chrysler did research and testing on these Magnum manifold ports to make sure that each cylinder ended up with the same amount of egr,
since the exhaust manifold back pressure influences the "internal egr" left after the exhaust stroke.

The fact that Chrysler later made the 1994 and after outlets smaller seems to point to these Magnum manifolds equallizing the flow from each port.

When you retrofit Magnum exhaust manifolds onto earlier engines i bet the engine runs a bit smoother in typical 1500 to 3000 rpm part throttle daily driving.

The fact that at least one side of the Magnum manifolds flows very well at high rpm and wide open throttle is just an added benefit.

these are the manifolds i pulled off (not my auction but same part numbers)
http://www.ebay.com/itm/1999-DODGE-RAM-1...7-/231828060461

this is what the outlet looks like, no not much room for porting

Mine are the early big outlet manifolds.....some say they fit others say they don't.....looks like I am gonna have to try them....to the fella that said just go with headers....I'd love to but like I said my wife is watching the budget super sharp as we have one son getting close to college and she is planning our 20th anniversary trip to the UK so little to no cash spent is my goal

The magnum drivers manifold will NOT fit with power steering in an a-body, period.

Feel free to give it a go.

Alright solved, looks like I'm gonna have to take em off your hands