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Re: ...340 manifolds, or magnums...?
[Re: Mad-Max]
#3151316
06/13/23 07:18 PM
06/13/23 07:18 PM
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Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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 ...at 54 yrs old and now with a young family...for me, thinking in depth about my coming projects is just my way of exercising my brain in-between the precious little time and resources I have available to actually buy parts and build them, so it gives me a chance to vet my ideas and fine tune my plans, including whether or not to buy a set of 340 manifolds...which thanks to all of these great discussions I'm now convinced I will not need to do. I also wouldn't be surprised if there are others pondering the same question, and if they read this they too will be reassured their 318 manifolds will be fine for the j.o.b. Plus, now I can put that (340 manifold) money towards a nice 318 cam...but that's another topic  ...but I will ensure the ports match as best I'm able - good 'put  Like so many others, this has been a really good and in depth discussion about exhaust manifolds for the small block LA and Magnum engines, and I appreciate everyone's patience and sharing of intel . - Sam I know all about the family thing, I'm 45 and got 9 kids so every penny here or there counts.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: ...340 manifolds, or magnums...?
[Re: HotRodDave]
#3151432
06/14/23 10:35 AM
06/14/23 10:35 AM
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Joined: Nov 2021
Posts: 245
Falcon, CO
Mad-Max
OP
enthusiast
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OP
enthusiast
Joined: Nov 2021
Posts: 245
Falcon, CO
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...at 54 yrs old and now with a young family...for me, thinking in depth about my coming projects is just my way of exercising my brain in-between the precious little time and resources I have available to actually buy parts and build them, so it gives me a chance to vet my ideas and fine tune my plans, including whether or not to buy a set of 340 manifolds...which thanks to all of these great discussions I'm now convinced I will not need to do. I also wouldn't be surprised if there are others pondering the same question, and if they read this they too will be reassured their 318 manifolds will be fine for the j.o.b. Plus, now I can put that (340 manifold) money towards a nice 318 cam...but that's another topic ...but I will ensure the ports match as best I'm able - good 'put Like so many others, this has been a really good and in depth discussion about exhaust manifolds for the small block LA and Magnum engines, and I appreciate everyone's patience and sharing of intel . - Sam I know all about the family thing, I'm 45 and got 9 kids so every penny here or there counts. duuuuude!!  
Last edited by Mad-Max; 06/14/23 10:38 AM.
71 Demon (project): 318, A-833od, 8-3/4, 3.23's
14 Wrangler JKU M-380 "Kilroy" (under construction): Magnum 360, 46rh, Atlas4, D60/14b-5.38s-Grizzlys, 40s
07 Ram 3500 MegaDually 4x4 "Big Mack": 5.9 6BT, G56 'Toy Hauler'
52 Willys M-38 "Poncho"
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Re: ...340 manifolds, or magnums...?
[Re: Mad-Max]
#3151513
06/14/23 02:59 PM
06/14/23 02:59 PM
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Joined: Sep 2003
Posts: 19,380
north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,380
north of coder
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wow ! you guys are still "yoots" !!!  over the [many] years my brother was growing up, and i was a junkyard owner, all the 318 cars he had retained the factory manifolds, but had muffler shop duals made with 2 1/2" pipe adapted to a short section of pipe off the manifolds after everything that was in the road cleared. sounded great, using aftermarket short turbo style mufflers. i tweeked the distributor just a bit on the weights and springs, and those 'ol 2bbl cars ran really well, plus got good gas mileage to boot ! 
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Re: ...340 manifolds, or magnums...?
[Re: Mad-Max]
#3154351
06/26/23 12:54 PM
06/26/23 12:54 PM
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Joined: Nov 2021
Posts: 245
Falcon, CO
Mad-Max
OP
enthusiast
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OP
enthusiast
Joined: Nov 2021
Posts: 245
Falcon, CO
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...another thing that separates the magnum exhaust manifolds from the LA counterparts is the magnums have the cast center divider between the 3/5 and 4/6 exhaust ports (center ports), so using LA manifolds on the magnum heads would be the same difference as using LA manifolds on LA heads, and while I would 'like' to have the center divider...if Ma Mopar didn't consider it important enough I won't either.
71 Demon (project): 318, A-833od, 8-3/4, 3.23's
14 Wrangler JKU M-380 "Kilroy" (under construction): Magnum 360, 46rh, Atlas4, D60/14b-5.38s-Grizzlys, 40s
07 Ram 3500 MegaDually 4x4 "Big Mack": 5.9 6BT, G56 'Toy Hauler'
52 Willys M-38 "Poncho"
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Re: ...340 manifolds, or magnums...?
[Re: moparx]
#3154651
06/27/23 11:17 AM
06/27/23 11:17 AM
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Joined: Jan 2005
Posts: 4,406
Michigan
MarkZ
Worthy
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Worthy
Joined: Jan 2005
Posts: 4,406
Michigan
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wow ! you guys are still "yoots" !!! over the [many] years my brother was growing up, and i was a junkyard owner, all the 318 cars he had retained the factory manifolds, but had muffler shop duals made with 2 1/2" pipe adapted to a short section of pipe off the manifolds after everything that was in the road cleared. sounded great, using aftermarket short turbo style mufflers. i tweeked the distributor just a bit on the weights and springs, and those 'ol 2bbl cars ran really well, plus got good gas mileage to boot ! ![[Linked Image]](https://media.tenor.com/sUQveloOl1EAAAAC/what-is-a-yout-yout.gif)
1987 Fifth Avenue - 512/518/D60
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