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banger, six or flat caddy v8, what should i run?

Discussion in 'The Hokey Ass Message Board' started by malaguena, Jan 29, 2012.


which motor?

Poll closed Mar 29, 2012.
  1. 1930 model A motor

    3 vote(s)
  2. mopar flathead six

    17 vote(s)
  3. cadillac flatty V8

    37 vote(s)
  1. So ive a little 39 dodge pickup truck thats been turned into a roadster. Ive got the steel for the frame, ford 9" rear end, 40 ford front end, 34 chevy grille, etc. But im still looking for the RIGHT motor for it.

    These are cheap, near the same price, thus my options.

    1930 model A motor and truck tranny. Runs but smokes black.

    a 1954 plymouth flathead six and auto. runs and shifts well.

    a 1948 caddy flathead v8, rebuilt 25 years ago and has been sitting, with auto.
  2. 38FLATTIE
    Joined: Oct 26, 2008
    Posts: 4,350

    from Colorado

    Caddy flathead, without a doubt. It has the most HP, most torque, and a definite 'cool' factor!
  3. Zandoz
    Joined: Jan 23, 2012
    Posts: 307


    I'd stick with MOPAR. The Plymouth 6 is rock solid reliable, and looks old school nifty with some of the speed equipment still floating around out there. Plus it would be something very different from the run of the mill stuff.
  4. The cadillac definately isnt something you see very often. Its rebuilt, but never installed and has been sitting for 25 years. I suppose id have to tear it down and put in new gaskets. Im sure the tranny is bad now after sitting that long, so maybe theres an easy tranny adaptor out there.

  5. william.ali.kay
    Joined: Nov 20, 2009
    Posts: 824

    from Milwaukee

    Nother vote for the Caddy.
  6. Keep it in the family, I'm for the flathead 6
  7. Cutlassboy68
    Joined: Dec 3, 2011
    Posts: 593

    from Boone, Nc

    Flathead 6... I think crossbreeding is bad...
    Thought about a little hemi?
  8. pinkynoegg
    Joined: Dec 11, 2011
    Posts: 1,135


    caddy V8. super cool and would be alot more power
  9. 38FLATTIE
    Joined: Oct 26, 2008
    Posts: 4,350

    from Colorado

    You can run a Caddy stock 3 speed easily, or Wilcap makes an adapter to a Chevy Automatic, or Ford Fe bellhousing.

    How about a huffer on one? Here's a 4-71 intake for a Caddy flathead.

    Also, check out Keeper's site,

    For a monster, blown Caddy flathead, check out my build thread:

    For Cadillac flathead horsepower tricks:

    If you don't go with the Cadillac flathead, I might be interested in it!


    Attached Files:

    Last edited: Jan 29, 2012
  10. 31HotRodLincoln
    Joined: Mar 21, 2007
    Posts: 167


    I vote for the caddy 346 because i have one too...they are heavy like 900#lbs heavy...
    get the caddy running on a stand and warm it up and see!
  11. chevydave1965
    Joined: May 2, 2010
    Posts: 370

    from Iowa

    Caddy V8. Thats my vote. Very cool !
  12. marman1950
    Joined: Jun 29, 2008
    Posts: 171


    My buddy has a dodge straight six with evans aluminum heads and Evans dual intake. That motor turns heads at all the shows. I will see if I can put up some pics.
  13. KomoG2
    Joined: Mar 10, 2009
    Posts: 170

    from Utah

    Flatheads Forever, Caddy Hands Down!!!!
  14. marman1950
    Joined: Jun 29, 2008
    Posts: 171


    Sounds great too.

    Attached Files:

  15. RainierHooker
    Joined: Dec 20, 2011
    Posts: 2,018

    from Tacoma, WA

    Caddy, no doubt...
  16. Well it sounds like most here dig the idea of the caddy mill. Its definately a cool looking motor, but i think any hop up parts would be rather expensive for it. I cant get over how awesome that blown caddy looks in that RPU though.

    I suppose headers could be fabbed, cams could be ground, all id really need is to eventually find a killer intake for it.

    Its just a tough choice for me, theyre all the same price. The A runs but smokes badly, the flat six and auto runs and shifts fine though. The caddy is rebuilt and partially assembled, its just been sitting for 25 years. Which i assume means that it just needs to be tore down, regreased with new gaskets and assembled again.
    Last edited: Jan 30, 2012
  17. 38FLATTIE
    Joined: Oct 26, 2008
    Posts: 4,350

    from Colorado

    If you don't like the blower intake, you could fab your own.

    Here is a stock intake I fabbed into a tri-carb setup, then had Cermachromed.

    Second one is a Burrell intake, dressed by Dickster27.

    Zibo fabbed a cool set of lakester style headers-search Zibo 40 Ford.

    There are more speed parts becoming available for the Caddy everyday.

    Of course, you could use the Mopar, and sell me the Caddy!:D

    Attached Files:

  18. emiliedk
    Joined: Dec 29, 2004
    Posts: 614

    from denmark

    caddy no doubt!!
    Buddy..I love that tricarb intake.

    today in the shop!

  19. slik
    Joined: Jan 11, 2008
    Posts: 183


    I love the flathead caddy, but put the flat 6 in it.
    I did a car a couple years back with the mopar flathead six. definitely cool.
    and you can still get parts for them at napa and a couple other places.
    turns out that they ran this motor up thru the early 90's in hi-lo.
  20. 38FLATTIE
    Joined: Oct 26, 2008
    Posts: 4,350

    from Colorado

    Palle, that's wicked!

    I think we may be a bad influence on malaguena! Lol!
  21. id love to run the cad flatty, its just cost that worries me.
  22. 38FLATTIE
    Joined: Oct 26, 2008
    Posts: 4,350

    from Colorado

    Then run a SBC....:eek:;)
  23. wingman9
    Joined: Dec 30, 2009
    Posts: 804

    from left coast

    Love me some sbc! :D
  24. Well it looks like im running the mopar flat six and auto.

    Sorry guys, id love to run the caddy but just cant afford the rebuild right now.

    heh, and no chance id be cuaght dead running a sbc.
  25. brianj
    Joined: Jan 1, 2012
    Posts: 92


    Run the six, save up for the caddy. Of course, if you are like me, you will probably run across another engine you just have to have in the meantime-- I have several engines i had to have, and no home for them yet1
  26. 39 chevy kustom
    Joined: Aug 9, 2008
    Posts: 427

    39 chevy kustom

    No question , flat cad all the way.
  27. rshooman
    Joined: Feb 20, 2012
    Posts: 13


    I am new to this sight, but I love what I am seeing. The more I look the more I discover.

    38 Flattie, I have a 1940 72 series formal sedan that I am considering doing up with a blower. There were only 100 made, so I want to do it right and do it different.

    Can you help me out with do's, don'ts, necessary prep work to motor when I do it over, any tech information? Frim what I have stumbled over on this site, it looks like you do some pretty cool stuff and have the knowledge to keep me out of trouble.

    Should I go with a 371 (I have one available to me) and over dirve it or go with a 471 and underdrive it?

    Any ideas / help on an intake and cam?
  28. 38FLATTIE
    Joined: Oct 26, 2008
    Posts: 4,350

    from Colorado

    I don't want to hijack this thread, so I'll be brief.

    Go with the 4-71. It creates less heat to underdrive a blower than overdrive a blower. Collin makes the nice 4-71 intake, pictured below. You can go with a 4 bbl, 2x2, or tri-power on top of the huffer.

    Do at least mild port work, especially on the exhaust-if it breathes better, it will make more power.

    Go to a bigger cam-I think something like a Winfield SU-1A, or better yet, a 425 eliminator, like Pete1 grinds. Use solid lifters.

    Dual exhaust is a must.

    Upgrade to an HEI dizzy. The boost will like a hotter spark.

    Instead of the current water pump setup, inject and remove water from both sides of the engine, for better, more even cooling.

    Last pics are of my 6-71 blown, inter-cooled, Enderle injected race engine.

    Attached Files:

  29. Hdonlybob
    Joined: Feb 1, 2005
    Posts: 3,924


    Caddy hands down!
  30. I see your point on the cost....but when you get the dough go with the Caddy for the cool factor.

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