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Technical Ram Horns

Discussion in 'Traditional Hot Rods' started by Willywash, Mar 21, 2020.

  1. Willywash
    Joined: Sep 18, 2019
    Posts: 54


    Anyone have experience with the smoothie ram horn exhaust manifolds? I think they look really old school. I'll be using them on a SBC in a 31 Model A Coupe. Will I have problems with burning plug wires? Thinking they might look better then hugger headers. Any other problems to consider?
    Joined: Jul 20, 2006
    Posts: 2,424


    Use them they look better than headers. You won’t burn plug wires as long as you route them correctly
    mgtstumpy, Deuces, nunattax and 4 others like this.
  3. jetnow1
    Joined: Jan 30, 2008
    Posts: 1,536

    from CT
    1. A-D Truckers

    Gm built millions of cars with them, you can route the wires just as they did.
  4. squirrel
    Joined: Sep 23, 2004
    Posts: 46,104


    Kan Kustom, 49ratfink, Deuces and 6 others like this.
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  5. 56sedandelivery
    Joined: Nov 21, 2006
    Posts: 6,218


    When using the factory Rams Horn exhaust manifolds, I take advantage of the little "web" that sits between the two center runners. I drill a hole through it, use an aftermarket, custom, 4 wire spacer, and use straight end plug boots. Simple and effective, with everything neat and tidy. I am Butch/56sedandelivery.
  6. Shorty
    Joined: Sep 11, 2002
    Posts: 45


    Found this....... hope it helps
  7. OLSKOOL57
    Joined: Feb 14, 2019
    Posts: 445


    I’m using them, definitely look better than hugger headers.
  8. Phil P
    Joined: Jan 1, 2018
    Posts: 268

    Phil P

    How important are those heat shields above the spark plugs?

  9. deathrowdave
    Joined: May 27, 2014
    Posts: 2,147

    from NKy

    Used many sets , not one issue . There are a few different type in OEM configurations . 2 in exhaust , 2 1/2 exhaust , rt curve back , lt curve back , generator mount lt or rt . I have seen aftermarket models , I can not see why they would not be as nice as OEM . To me a street driven car , headers are a PITA x 10 . , not needed . I want to do more things than retightening bolts and replacing gaskets . Hell I have a rattle trap roach Harley if I need something to tighten up things on daily !
    belair, foxforcefive, Deuces and 2 others like this.
  10. Blake 27
    Joined: Apr 10, 2016
    Posts: 586

    Blake 27

    Just as Squirrel said, run the front wires behind the motor mount pad.
    This is how I routed my plug wires. HPIM0206.JPG
  11. squirrel
    Joined: Sep 23, 2004
    Posts: 46,104


    they were more important in the days before silicone plug wire boots, but Chevy used them for decades...and they don't like spending money they don't have to spend.
  12. DDDenny
    Joined: Feb 6, 2015
    Posts: 13,439

    from oregon

    Smoothie, are you talking aftermarket manifolds, smoothed oem, what?
    "Old school", I'm old, not old school though.
  13. 427 sleeper
    Joined: Mar 8, 2017
    Posts: 1,020

    427 sleeper

    Like has been said, if you're gonna use factory style exhaust, factory plug wire routing will work the best. There's a reason the factory did things the way they did. ;) I also like to use the stainless Banana Shields on 1&3 and 2&4 whenever possible. But that's just me though... :)
    Kan Kustom and Deuces like this.
  14. Bob Lowry
    Joined: Jan 19, 2020
    Posts: 41

    Bob Lowry

    Years ago I no longer did headers, but instead went with ram horns. Stock ones had 2" outlets, whle the
    340hp Corvettes had 2 1/2" outlets. Check the web for Dorman products who offer the 2 1/2" ones for like
    $89 each, versus the $200+ you see from other people. I have used these without heat shields for years with
    no issues. They make some really simple spark plug wire holders that attach to your valve cover screws that work great. Look for them in Chevelle or Impala catalogs.
  15. Ben Chirco
    Joined: Oct 21, 2019
    Posts: 76

    Ben Chirco

    I want to install the smoothie manifolds on my model a with a 350. Driver side is extremely tight. I am including a picture of a dimension i need to be sure it will fit my application. Can someone provide that? Or are they made to exact size of the OEM manifolds?
    dimension on header.jpg
  16. Willywash
    Joined: Sep 18, 2019
    Posts: 54


    I like the Tru Ram brand, but they are three hundred a pair. The arch raises higher than OEM and are completely smooth.
    The Shift Wizard likes this.
    Joined: Mar 21, 2014
    Posts: 711

    from okc

    Use GM ram horns, corvette have bigger exhaust ports, think they sell them new.....
    Truckdoctor Andy likes this.
  18. Deuces
    Joined: Nov 3, 2009
    Posts: 18,539

    from Michigan

    ......and they're worth 10 more h.p. with the 2.500" dia. outlet..... ;)
    Truckdoctor Andy likes this.
  19. Dooley
    Joined: May 29, 2002
    Posts: 2,648

    from Buffalo NY

    This is how I ran my wires.. 20190424_193927.jpg
    Deuces likes this.
  20. I've ran into plug clearance problems with repro 2.5" Corvette style rams horns and Vortec heads. I am going to headers to gain clearance, avoid burning boots/wires. I've tried shields and covers, not happy with the results. Your situation may vary, just my .02.
  21. H380
    Joined: Sep 20, 2015
    Posts: 433

    from Louisiana

    That's the problem. Rams horns don't fit Vortec heads. No one makes a pair that does fit 100%. Huge opening for someone to fill a big need.
    Deuces and 427 sleeper like this.
  22. The Shift Wizard
    Joined: Jan 10, 2017
    Posts: 1,955

    The Shift Wizard

    +2 on the Tru Rams.
    They are a kind of new option on the market and don't have that angular, lumpy, gusseted appearance of the older options. So toe-the-traditional-line owners who want every detail just like Fred flintstone did it might not appreciate the look. On the plus side, they have an actual collector and flow like headers so they're not just a pretty face.
    Deuces likes this.
  23. Phil P
    Joined: Jan 1, 2018
    Posts: 268

    Phil P

    Here you go. image1.jpeg image0.jpeg

    Looks like 3.4 inches. These were stock manifolds off a 66 Corvette (of course ;))

  24. j3harleys
    Joined: May 12, 2010
    Posts: 815

    from colorado

    I have oem 2.5 early Corvette ram horns on a 1996 L31 Vortec in my 58 Impala. The fit fine. I have not had any problems with clearance or burning boots.
    Deuces and pprather like this.
  25. deucendude
    Joined: Oct 31, 2008
    Posts: 569

    from norcal

    I use the factory heat shields. I just feel better.
    Deuces likes this.
  26. Fiend42
    Joined: Mar 8, 2012
    Posts: 189


    Run the wires like the factory did with ramhorns, pictures are available. 1 and 3 ran down along the oil pan rail to pass the header.
  27. tj
    Joined: Aug 19, 2006
    Posts: 490


    I used 1 ton truck left side on A’s. It kicks in and back to get extra clearance on the steering shaft if needed. Don’t remember the part number. A lot of them cracked from the weight of the exhaust from not being supported. Standard ram horn on right side is okay.
  28. bschwoeble
    Joined: Oct 20, 2008
    Posts: 551


    Never liked the look of wires over the valve covers. Look at the info. Shorty provided. You can't go wrong doing it this way. Everything looks very tidy.
  29. billthx138
    Joined: Oct 17, 2009
    Posts: 395


    I always use rams horns, dont have to worry about the exhaust leaks associated with headers. Heres a routing method.
    100_8462.JPG 100_8397.JPG

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