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Username Post: Rams horn manifols vs Headers?        (Topic#226992)
Number21 
Senior Member
Posts: 811
Number21
Loc: OR
Reg: 02-01-05
10-01-09 08:29 PM - Post#1781595    

I've got a '79 1 ton truck with a 350 and my ultimate goal is somewhere close to 1HP/CI. I'm starting with the exhaust, because it needs it now. I was going to buy a cheap set of headers from Jegs, because my stock log manifolds are rusted out, but then I realized the "rams horn" type exhaust manifolds are even cheaper. I like to use genuine GM parts when I can, and the manifolds are probably less likely to leak than cheap headers.

Anyway...how would the performance compare between 2.5" oulet rams head manifolds or 2.5" collector headers? Behind that I'll be running new duals, probably 2.5" the whole way.

 
55chevy383 
Silver Supporting Member
Posts: 1314
55chevy383
Age: 46
Loc: Noble, Ok.
Reg: 12-08-05
10-02-09 05:22 AM - Post#1781703    
    In response to Number21

Headers will perform better, if you can afford them get them.

Phil
11.66 @ 115 N/A.
Phil's '55


 
Big Jacks Auto 
Contributor
Posts: 314
Big Jacks Auto
Loc: Syracuse, N.Y.
Reg: 08-14-07
10-02-09 05:39 AM - Post#1781711    
    In response to Number21

I was actually stuck running a set of the 2.5" rams horns manifolds on my blown small block about ten years back
they actually peformed pretty well
I would go with the headers for performance reasons on anything over say 250 hp
proably will gain more in the mid to higher rpm ranges with the headers. of course you will experience more rust issues if driven in snow or wet weather and leak issues and of course the headers will be louder under the hood than the manifolds
getting 350 hp out of a 350 is pretty easy these days
if you have a set of 1.94 x 1.50 heads just install a comp cams 280 magnum cam and an edelbrock performer or performer eps or rpm manifold
you can get 400 hp with the 292 magnum cam but you may experience some issues with clearance depending on the pistons.
let me know if you need any specific examples of using these cams in 350's
S.H.R.A
Syracuse Hot Rod Association
55 Chevy 327 Muncie 4 speed
Prostreet Studebaker x Gasser SBC 6-71 Blown
Video of My SBC powered Studebaker


 
DavidTX 
Frequent Contributor
Posts: 1097
DavidTX
Loc: Killeen, TX
Reg: 08-11-03
10-02-09 06:01 AM - Post#1781722    
    In response to Big Jacks Auto

You know the old saying "You can pay me now or you can pay me later". Get porcelain covered headers. They will last almost forever and reduce the under hood heat considerably. In the long run they will be more efficient and save you money.


 
Impala65SS 
Valued Contributor
Posts: 3767
Impala65SS
Loc: Sweden
Reg: 08-23-07
10-02-09 11:22 AM - Post#1781868    
    In response to Number21

Yes to headers.
Ultimately either stainless, hard chromed or ceramic coated are the best longterm choice - until then, get a pair of used headers. If not else, to act as a mock-up to build the exhaust you want for the future proper headers. I've never bought a pair of new headers - always used or they were already on the vehicle - never had a leak problem from head flanges or collector flanges even reused collector flange gaskets. I did have rust holes though... I will get a pair of stainless longstyle headers for my suburban though.

The flow impairment of any log style or rams horns is just too great to even consider 30hp down the drain for no good reason.
http://www.youtube.com/watch?v=SXn2QVipK2o&a mp;fea...


 
52chevybob 
Dedicated Enthusiast
Posts: 5628

Reg: 05-27-08
10-02-09 01:53 PM - Post#1781961    
    In response to Impala65SS

If you want a loud exhaust, go with the headers as they will participate in the sound. The CI Rams horn manifold will be a lot quieter and not lose all that much power. Use the large ones from Speedway.
Also, if yoou're in the rust belt, headers will quickly rust away if they're not coated and even then, they'll still go.

 
wheelman 
Valued Contributor
Posts: 3203
wheelman
Loc: Long Island--New York
Reg: 04-14-07
10-02-09 02:55 PM - Post#1782011    
    In response to 52chevybob

I use the rams horns on my 327 that puts out roughly estimated 300-325HP and I considered switching to Headers(full tube) but live by the ocean so rust is an issue as well is the fact that mny accessories bolt to the exhaust manifolds and my heads have no accessory holes so I would have to get extra custom bracketry, so I stayed with Rams Horns and they work pretty darn good.
1968 Impala Sports Coupe
1997 Buick LeSabre Custom
Save a Classic - Crush an Import
My 68 Impala


 
awsum55 
Senior Member
Posts: 8838
awsum55
Age: 62
Loc: O.P. Kansas
Reg: 09-27-01
10-02-09 03:29 PM - Post#1782030    
    In response to wheelman

Headers will only make a significant difference in the top end. I wouldn't worry about using rams horns unless you are going to race it.
Five things that you cannot recover in life:

* The Stone after it's thrown
* The Word after it's said
* An Occasion after it's missed
* The Time after it's gone
* A person after they die


 
MikeB 
Senior Member
Posts: 9533
MikeB
Loc: Plano, TX
Reg: 08-28-03
10-02-09 05:48 PM - Post#1782109    
    In response to Number21

If you get the 2.5" ram's horns, make sure your crossmember won't interfere with the straight down dumps. My 69 2WD pickup requires the angled back versions that are only available in 2.0".

I doubt you would ever notice any seat-of-the pants performance difference between 2.5" rams horns and headers on a street engine. And the rams horns will never leak, warp, or have their coatings bubble or flake off. And the thick cast iron keeps the heat inside the manifolds, where it's supposed to be, instead of heating up brake and fuel lines.

1982 C-10 SWB pickup -- Unmolested, original paint, 250 six, 3-on-the-tree
(Soon to be 350 w/Vortec heads & TH350)

Sold my 55 sedan in June 2014, having owned it 11 years.


Edited by MikeB on 10-02-09 05:50 PM. Reason for edit: No reason given.

 
Impala65SS 
Valued Contributor
Posts: 3767
Impala65SS
Loc: Sweden
Reg: 08-23-07
10-03-09 05:38 AM - Post#1782241    
    In response to 52chevybob

  • 52chevybob Said:
If you want a loud exhaust, go with the headers as they will participate in the sound. The CI Rams horn manifold will be a lot quieter and not lose all that much power. Use the large ones from Speedway.
Also, if yoou're in the rust belt, headers will quickly rust away if they're not coated and even then, they'll still go.



I guess sound is perceived differently - but I just compare with my Biscayne 2" Hooker competition headers, 3" homemade exhaust, homemade X-pipe, 3" exit in front of rear wheels, no mufflers... At normal crusing it's OK, - when taking over, they will know I'm coming
http://www.youtube.com/watch?v=SXn2QVipK2o&a mp;fea...


 
Impala65SS 
Valued Contributor
Posts: 3767
Impala65SS
Loc: Sweden
Reg: 08-23-07
10-03-09 05:43 AM - Post#1782245    
    In response to awsum55

  • awsum55 Said:
Headers will only make a significant difference in the top end. I wouldn't worry about using rams horns unless you are going to race it.


Well, the fuel consumption can easily be knocked off with 10% - I'd say 25% in many cases. all due to better flow and better scavenging (less charge dilution)... and knowing there is more in the top rpm is a good feeling
http://www.youtube.com/watch?v=SXn2QVipK2o&a mp;fea...


 
awsum55 
Senior Member
Posts: 8838
awsum55
Age: 62
Loc: O.P. Kansas
Reg: 09-27-01
10-03-09 07:54 PM - Post#1782607    
    In response to Impala65SS

I just switched from long tube headers to rams horns on my Vette and can see no difference at all.
Five things that you cannot recover in life:

* The Stone after it's thrown
* The Word after it's said
* An Occasion after it's missed
* The Time after it's gone
* A person after they die


 
Impala65SS 
Valued Contributor
Posts: 3767
Impala65SS
Loc: Sweden
Reg: 08-23-07
10-04-09 02:40 AM - Post#1782653    
    In response to awsum55

  • awsum55 Said:
I just switched from long tube headers to rams horns on my Vette and can see no difference at all.


When I swap parts I don't expect any radical change from, let's say switching the alternator position from passenger side to driver side, I generally don't make an effort to verify an impact from the change either. So given your assumption - headers and cast manifolds don't make a difference - did you actually bother to verify

The reason I know, I fool around with my daily drivers as well, where I keep a fairly tight log over fuel consumption.
http://www.youtube.com/watch?v=SXn2QVipK2o&a mp;fea...


 
1983G20Van 
Super Senior Member
Posts: 3223

Loc: Bedford, Texas, USA
Reg: 11-13-02
10-04-09 11:14 AM - Post#1782809    
    In response to DavidTX

  • DavidTX Said:
You know the old saying "You can pay me now or you can pay me later". Get porcelain covered headers. They will last almost forever and reduce the under hood heat considerably. In the long run they will be more efficient and save you money.



I agree here.. You may be able to do what I did and find a set of used Doug Thorley Tri-Y headers on Craigslist or Ebay. They are IMO the BEST header design and setup for a small block chevy. You will gain HP/TQ and fuel mileage over even the Rams Horn manifolds. I had what I consider the BEST cast iron manifolds (late model LT1) and got a noticeable seat of the pants increase over them.
1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


 
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