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  1. 'Mad Max'

    Magnum Exhaust Manifolds in an A Body

    very interesting thoughts about manifolds - thanks to everyone posting up the great points of view. Sounds like the bottom line is there likely isn't much difference between regular and "HP" manifolds, at least not so much that anyone would really notice, with the exception being real racing...
  2. 'Mad Max'

    Magnum Exhaust Manifolds in an A Body

    correct, for both the 5.2 and 5.9, which is also the same outlet size as the passenger-side 340 center dump manifold. I just checked and the 318 is 1-3/4" outlet...but a 318 is not a huge engine.... 318 above, 340 below - Still tho...I really wonder how much that tiny difference will...
  3. 'Mad Max'

    Magnum Exhaust Manifolds in an A Body

    ...regarding port sizes and sealing to a magnum head, another bit I can offer into the discussion pool is I just finished firing up my 02 Dakota - it retained its mag 360 and now has an Eddy 7577 and Holley 2bbl Sniper (w/ adapter). To keep things simpler with the exhaust routing and such...
  4. 'Mad Max'

    Magnum Exhaust Manifolds in an A Body

    yep copy - while I do have a set of those the interference with the power steering box is a non-starter...plus if I have the choice I'd really like to have era-matching manifolds
  5. 'Mad Max'

    Magnum Exhaust Manifolds in an A Body

    ...fair points about the inlet and outlet ports. I'm pulling the 318 manifolds off today and will measure the outlet port sizes, and I'll measure the head port sizes for comparison. Hopefully the outlets are at least the same as the 1-7/8" magnum outlets.
  6. 'Mad Max'

    Magnum Exhaust Manifolds in an A Body

    ...maybe 318 manifolds... So to recap, I'm building a fun 71 Demon. Dropping in a nice warm magnum 318, with a 4bbl and nice '340' cam, and an A-833od 4-speed, and 3.23 gears - just a nice clean-running hot street machine that cruises perfectly on the highway and idles with a bit of lope -...
  7. 'Mad Max'

    Magnum Exhaust Manifolds in an A Body

    ...so this is an old thread but man is it a good one - very valuable and even in 2023 still very relevant intel on the pros and cons of running small block magnum exhaust manifolds in an A-body. I am pondering this very thing for my build now, and wanted to respond with a quick recap to make...
  8. 'Mad Max'

    72 340 pass side manifold

    turns out the ones I just got are 4041466, which I think is the later 70's manifolds, maybe more correct for an LRE...I think - either way them's the ones I'm using.
  9. 'Mad Max'

    72 340 pass side manifold

    just to follow up - I discovered the motor mounts in our 94 Jeep Grand Cherokee utilize the LA bosses and not the magnum bosses, and as such I'm using two of the p-side GC mounts on my 02 magnum 360 (one on each side), which gives me all the room I need to use center dump manifolds - simple and...
  10. 'Mad Max'

    72 340 pass side manifold

    in my mind, a center dump 1-7/8" manifold should flow equally the same as a rear dump 1-7/8" manifold - can't imagine a reason why a rear dump would 'flow' better, but even if it does it can't be a lot better, but either way I've decided to go with the 340 manifolds and call it 'good enough'...
  11. 'Mad Max'

    72 340 pass side manifold

    center dumps are the simplest to plumb on both sides for my application - a truck.
  12. 'Mad Max'

    72 340 pass side manifold

    possibly...but at what rpms? I'm thinking 'any' 318/340/360 manifold likely flows equally enough up to ~4000 rpm to be 'moot' from a performance standpoint, and I've also read they are likely better flowing in the higher rpms...but not by a lot, plus my engine won't be in the higher rpms enough...
  13. 'Mad Max'

    72 340 pass side manifold

    really good thread - old but very relevant, and I'd like to hop on this 'musical manifolds' train with another manifold question, but regarding 'truck engines'. I'm building an 02 Magnum 360 - stock long block save for a Comp Cams cam (#20-745-9: 212-218 (264/270), .480/.480, on a 114* LSA)...
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