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te.ringer
06-29-2013, 12:31 PM
finished up my 340 engine. my 340 stock exhaust manifolds have no part numbers any idea what year they are? my other 340 looks just like them but have numbers is this normal? I want to order a new exhaust system are they the same ?

aarracer
06-30-2013, 06:23 PM
Govier's book shows no casting number for 1973.

te.ringer
06-30-2013, 06:40 PM
thanks I wonder why? I picked them up at a mopar scrap yard in the trunk of a wrecked roadrunner someone put headers on .about 10 years ago

Duster_340
07-03-2013, 05:26 PM
The best manifolds are casting 2863549 and 2863553. These came on 68-70 340's. In 71 the passenger side changed to a poorer manifold. I would not run anything but the manifold's above. I have been running them on my 340 for years now.
The good manifolds passenger side is designed "header like". If both your side are the "log" design you have some variant of the poorer manifolds.

te.ringer
07-04-2013, 11:40 AM
I think the ones I have are 340/maybe 360 hp they look just like the 340 manifolds on my friends 69 duster which is stock but mine don't have any part/casting numbers. Aarracer said they are 1973 so I will order the exhaust that way. I'm going to Carlisle pa .next Saturday for the mopar show I'll get to see many stock 340 there

Duster_340
07-04-2013, 05:28 PM
Yes sounds like you have the low flow manifolds. You will see what I mean when you see the "good" 2 1/4 inch outlet manifolds. Cars 1968-70 had them. I googled them and saw a pair for $200.00.
If they cost twice that, I would still use them. They flat out perform..and sound awesome...I know, I switched to them from headers 15 years ago. They also look great..I use plasticote high temp black paint.

Not trying to be pushy..but I've tried lots of headers etc...Hi Flows are GREAT.

340_GTS
07-05-2013, 12:18 AM
The good ones...
http://members.toast.net/billgold/photos/_My%20Real%20Cars_/1969_Dodge_Dart/New_Engine_Parts/DSC01259.JPG

aarracer
07-05-2013, 01:44 PM
I think the ones I have are 340/maybe 360 hp they look just like the 340 manifolds on my friends 69 duster which is stock but mine don't have any part/casting numbers. Aarracer said they are 1973 so I will order the exhaust that way. I'm going to Carlisle pa .next Saturday for the mopar show I'll get to see many stock 340 there

Carefull now!

I only said - and referenced!


"Govier's book shows no casting number for 1973."

te.ringer
07-05-2013, 05:57 PM
well those are the ones I got .but not as nice looking as them.

thanks for the help!

Slingshot383
07-08-2013, 01:05 PM
If you get then extrude honed, they will work even better, then get them ceramic coated.

DartGT66
07-17-2013, 03:15 AM
Tested on a dyno in a mild 410 cu in six pack, 340 manifolds with 2.5" exhaust made 5% less peak power and 10% less low end torq than cheapo 1 5/8" primary headers with the same exhaust and mufflers. I don't think they perform that well, none of the manifolds do (similar results with BB magnum manifolds compared to 1 3/4" primary Hookers.
http://www.moparmusclemagazine.com/techarticles/engine/mopp_0307_mopar_crate_engine_exhaust/

te.ringer
07-17-2013, 08:08 AM
I've seen this before, I was at carlise pa last weekend for the mopar show gives you many ways to look at things,just going with stock exhaust for the easy way our this is just a street car.

340_GTS
07-17-2013, 09:21 AM
Tested on a dyno in a mild 410 cu in six pack, 340 manifolds with 2.5" exhaust made 5% less peak power and 10% less low end torq than cheapo 1 5/8" primary headers with the same exhaust and mufflers. I don't think they perform that well, none of the manifolds do (similar results with BB magnum manifolds compared to 1 3/4" primary Hookers.
http://www.moparmusclemagazine.com/techarticles/engine/mopp_0307_mopar_crate_engine_exhaust/

I'd like to see a test like that on a 340/360 cubic inch engine. No doubt the 340 manifolds were inadequate on a 410 cu. in. motor. They were never designed fot that kind of flow.