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HEMI Tech- Intakes and exhaust manifolds

Discussion in 'The Hokey Ass Message Board' started by scootermcrad, Jul 5, 2006.

  1. scootermcrad
    Joined: Sep 20, 2005
    Posts: 13,071

    scootermcrad
    ALLIANCE MEMBER

    This has to be one of the most popular topics for Hemis (and any motor for that matter). What should be used and what's available for these old motors.

    1) Intake manifolds...
    - What's good for what application?
    - What manifolds will "over-carb" in relationship to various set-ups?
    - Vacuum considerations?
    - Cast vs. U-fab intakes?
    - Features of various stock manifolds for different makes and models? (I.E. Water flow)
    - Who's still making them and where can I get one?

    2) Exhaust manifolds...
    - Which ones are interchangable and for which makes and models?
    - Types available?
    - Stock vs. aftermarket?
    - Make your own or buy them?
    - Who sells the headers, kits, etc.?
     
  2. SinisterCustom
    Joined: Feb 18, 2004
    Posts: 8,252

    SinisterCustom
    Member

    I see the u-fab units on E-bay alot. Available unassembled, tacked or fully TIG welded in 4x2, 6x2 and 8x2:eek: .
    I have a feeling this is going to be a long thread with lots of good tips!:D
     
  3. George
    Joined: Jan 1, 2005
    Posts: 6,752

    George
    Member

    Quite a large # of choices on Chr. intakes. Up to '54 are wet with integral thermostat housing. '55 & later are dry intakes. Later intakes can be used on 51-54 by drilling the intake mounting flange where the water ports are, or drilling the front of the heads, & putting fittings in. A remote thermostat is then used. Afermarket intakes for Dodge & DeSoto are scarce!
     
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  5. scootermcrad
    Joined: Sep 20, 2005
    Posts: 13,071

    scootermcrad
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  6. scootermcrad
    Joined: Sep 20, 2005
    Posts: 13,071

    scootermcrad
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  7. Sixcarb
    Joined: Mar 5, 2004
    Posts: 1,497

    Sixcarb
    Member
    from North NJ

    I like the Weiand inline 4 carb and the stock 4 bolt exhaust manifolds, the exhaust manifolds will take a 2 1/2 pipe right from the flange that you can run down cap off and come off the top of the pipe in 2" or whatever you like.
     
  8. George
    Joined: Jan 1, 2005
    Posts: 6,752

    George
    Member

    Some time ago in one of those "too little to do & too much time thinking" situations I had the following thought...take a '55 or later Hemi, put the Chevy W/P on it, & a 392 crossover (if '55 331 or 354), & a '54 wet intake. Run both thermostats & run both hoses to the radiator. Make someone walking by think you got a flathead in there & get a real suprise when they look. Sometime after that someone posted on here photo showing an early Hemi w a dry intake. They had tapped either the intake, or front of the heads & run both hoses to the radiator w/o the remote thermostat. Kinda what i was thinking!
     
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  9. scootermcrad
    Joined: Sep 20, 2005
    Posts: 13,071

    scootermcrad
    ALLIANCE MEMBER

    I think Pinkee's did that with the 29 RPU. Would look pretty neat I think!

    Anyone running the U-fab intakes like Crower used to offer and Lake Headers makes now? Anyone runing 6x2 with all six carbs dumping (progressive or whatever)? How do the manifolds hold up? How did you coat them... paint? Powder? Plating?
     
  10. SinisterCustom
    Joined: Feb 18, 2004
    Posts: 8,252

    SinisterCustom
    Member

    I think Jimmy White's coupe is running all 6 carbs all the time. But it's a Weiand Drag Star cast manifold. Carbs also mounted on spacers.
     
  11. scootermcrad
    Joined: Sep 20, 2005
    Posts: 13,071

    scootermcrad
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    Yes, Drag Star. Love that intake!

    This could be asked under the cam thread too, but I'll shoot it here first since it's related to this subject. With respect to cams, when should you jump from a 4x2 to a 6x2 intake manifold (without blocking carbs off)? I know there are lots of details to this answer (jetting, carb size, etc.), but generally speaking, what is a max cam that should be running with a 4x2 before you say... "I need more carbs"?
     
  12. George
    Joined: Jan 1, 2005
    Posts: 6,752

    George
    Member

    97s are rated @ 150 CFM, so 4 is 600 CFM, 6 is 900 CFM. 94s (depending on witch variant you have) range from 155 to 185. So 4 could be from 620 to 740 CFM. 6 range from 930 to 1110 CFM. You can see where 4 should be fine, but over carbing occurs quickly with 6, not to mention tuning that many!
     
  13. scootermcrad
    Joined: Sep 20, 2005
    Posts: 13,071

    scootermcrad
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    My thoughts exactly! Seems like you would have to have a hell of a cam to run six.
     
  14. Ruiner
    Joined: May 17, 2004
    Posts: 4,148

    Ruiner
    Member

    I'm running an old U-Fab I'll be picking up soon with 4 GM single barrels on it, might switch out to deuces later, but ultimately I'd like to go injected...might save the injection dream for the drag motor that will replace the current one being built...just as long as I don't pull a Littleman and blow my "street" motor and be forced to finish my drag motor to get it back on the road...
     
  15. Little Wing
    Joined: Nov 25, 2005
    Posts: 7,458

    Little Wing
    Member
    from Northeast

    anyone have stock 4 barrel intake casting #'s
     
  16. George
    Joined: Jan 1, 2005
    Posts: 6,752

    George
    Member

    what brand?
     
  17. Ruiner
    Joined: May 17, 2004
    Posts: 4,148

    Ruiner
    Member

    alright, the old U-Fab I was intending to run didn't work out for me, so I'm now contemplating the Weiand dual quad intake, anyone had luck with those? He doesn't list a powerband for his intakes if memory serves me right, but maybe he'd know offhand if I called?...I'll be running a 331 bored out to a 354 with 9:1 compression, fenderwell headers, stock crank and rods, Mallory Unilite/Pro Master/Hy-fire ignition, and haven't decided between a solid or hydraulic cam...if I do run this dual quad I'd like to run a pair of 600cfm Holleys...I'm trying to keep this build as close to '62-'63 NHRA gasser rules as possible, but would the Hot Hemi Heads tunnel ram be a better choice? he lists the powerband from 2800-7800 because of the design...I'm leaning towards the tunnel ram, not just for the coolness factor, but because of the lower powerband you usually don't see on a tunnel ram, and I'd like to drive this thing on the street quite a bit...what are your guys' thoughts?
     
  18. Ruiner
    Joined: May 17, 2004
    Posts: 4,148

    Ruiner
    Member

    ok, for retaining the early '51-'54 heads and using the later '55-'57 intake, what exactly do you need to do for water crossovers? George tried to explain it, but it wasn't descriptive enough for me to understand...what needs to be drilled on the intake mounting flange? and if you do that, where do you mount the remote thermostat? same goes for adding fittings to the front of the '51-'54 heads, where does the remote thermostat go?
     
  19. George
    Joined: Jan 1, 2005
    Posts: 6,752

    George
    Member

    2 pieces of hose(1 each side) Ys into a remote thermostat housing. Then a hose runs to the radiator. Haven't had to use one, probably make a bracket to mount above front of engine.
     
  20. scootermcrad
    Joined: Sep 20, 2005
    Posts: 13,071

    scootermcrad
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  21. scootermcrad
    Joined: Sep 20, 2005
    Posts: 13,071

    scootermcrad
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    I've seen this too. I'll dig through some pics and see if I can find something. Maybe someone else has some they can post in the mean time.
     
  22. Ruiner
    Joined: May 17, 2004
    Posts: 4,148

    Ruiner
    Member

    I'm assuming he means to drill and tap the later style '55-'57 intake manifolds in the center of the flange between the number 3 and 5 cylinder ports and the 4 and 6 intake ports where the stock early '51-'54 intake manifolds used to crossover...
     
  23. scootermcrad
    Joined: Sep 20, 2005
    Posts: 13,071

    scootermcrad
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    Yeah, that sounds about right.
     
  24. ks662
    Joined: Jan 11, 2007
    Posts: 49

    ks662
    Member

    Anybody seen one of these Desoto manifolds?I know it's not traditional but it looks good to me after searcing for impossible to find and exspensive stock four barrel manifolds.A seller on EBAY makes them for $600 bucks.I didn't post a link for the auction.Is it ok to put EBAY links on this board?
     

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  25. ratstar
    Joined: Feb 22, 2005
    Posts: 1,315

    ratstar
    Member

    I wouldnt post it. If someone wants it thay can search for it on ebay. I do like the looks of those but for 6 bills? I dunno. I think I would make my own for that price. I do like the idea and how the water is routed.
     
  26. George
    Joined: Jan 1, 2005
    Posts: 6,752

    George
    Member

    Depends on your personal preference. You should be able to get an OEM for that price.
     
  27. Tdesoto276
    Joined: Mar 22, 2006
    Posts: 76

    Tdesoto276
    Member
    from Des Moines

    I recently scored a factory dual four manifold for a high deck DeSoto. Any body have any ideas on the best carbs for this set up? If this gets buried in this discussion, I might post a new thread. Thanks in advance!
     
  28. Blown 61
    Joined: Feb 22, 2005
    Posts: 265

    Blown 61
    Member

    I had a 354 out of a dump truck that the exhaust manifolds where gold, 3 inch outlets.
     
  29. strombergs97
    Joined: May 22, 2006
    Posts: 1,890

    strombergs97
    Member
    from California

    :D Hello..This 3x2 came from Hot Heads..for my 241 Red Ram Dodge Hemi..I believe that the three 81s will perform just right for this mild build engine..Have 97s that I can put on it also..I also have a 4x2 Log intake and I'll see if the 241 can handle it with the 81s..or 97s..My hunchis the 3x2 with the 81s will be the way to go.. Would love to use the 4x2 log because of the looks..
    Will let you know which works best.:rolleyes:
    duane...
     

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  30. George
    Joined: Jan 1, 2005
    Posts: 6,752

    George
    Member

    Edelbrock 500 CFMs. They are wide & short vs Hollys being long. Carter used to make a pair of 400s for dual quads, probably extinct today.
     

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