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Ram Horn Manifold?

RAM horns on a 73+ engine mount will require a little trimming on the clamshell engine mount. At least on the drivers side.
 
They made some of those where the drivers manifold was angled back at the collector flange, I wonder if those might be a bolt on deal?

I dont remember what they came on though, Ive just seen them around.

I do however, own a pair of the 2.5" outlet ram horns.
 
find ones angled towards the back slightly to help aviod engine mount issues and a tight bend in the exhaust pipe to clear them.
 
Thanks for the info guys. I did a quick internet search and could not find a set of the angled ones. As matter of fact all I could find was the driver side that was angled back. If I do the ram horns I would like them to match on both sides. Maybe I'm just being picky.:rolleyes:

Or just run the straight dump and trim up the clam shell motor mount.

Is anyone running just the straight dump?

Edit........maybe they made them angled on the driver side only..........
 
One side is angled the other is not. I do remember doing a little grinding on one side.

I am running them on a motor from a 93 Sub in my 70. I am too cheap to re-do my exhaust right now. Been working fine for 5 yrs.
 
Yes,only the drivers side was angled on some of the ram horn manifolds...they stopped using them in 1972 I think,in '73 they went to the "log" style manufolds that exited farther to the rear to miss the new for '73 clamshell motor mounts..some of them came angled on the drivers side as well as flat across,the passenger side was at a 45 degree angle..
 
I'm pretty sure only 2.25 outlets had the bend back. And old chevy trucks had the bend on both sides I'm.sure. my 66 nova has an angled back on driver's side, but its 2.25 outlet.

Yes there were 2.25 angled for pass side but they were known to crack and were often replaced with straight ones
 
Ok, just checked, my 71 chevy has the angled back on.drivers side.

Maybe I missed it, but why do you want to run those ramhorns? Any details about your engine now?
 
Believe all the 2.5" ram horns are center dump, but some of the 2" ones are angled.
 
63chevyll said:
Ok, just checked, my 71 chevy has the angled back on.drivers side.

Maybe I missed it, but why do you want to run those ramhorns? Any details about your engine now?
Click to expand...

Well I have just been toying around with the idea of running them. My engine is bone stock. The two manifolds on there right now are cracked and need to be replaced. The exhaust system as a whole is shot and needs to be redone.

So the plan was to run 2.5 true dual exhaust with magnaflow muffelers. I don't want to do headers so I either need to replace the exhaust manifolds with the original kind or go with the ram horns. I like the ram horn idea because it would be 2.5 all the way from the manifolds back. And they are supposed to get a little better flow.

Suggestions ?
 
Personally, when I open a hood of a specific year of vehicle, I feel its appropriate to have orig parts on it. Or at least from the correct year/vintage.
If anything newer on older is better than older on newer.
But that's just my opinion. Not knocking or telling you what to do.

And most 350 manifolds flow very well for stock to mild applications. The 305 manifolds were prob the worst.
 
I looked up the ram horn manifolds in a friends Dorman catalog,they sell both styles new now--I was mistaken about the drivers side only having the angled outlet--they BOTH were angled on the 67-72 trucks,the passenger car ram hotns were a straight outlet on both sides in most applications,but some models did have a angled outlet on the drivers side also...I wasnt able to copy the part numbers down ,as my friend was in a rush to close up right after I got to his shop...but you can likely see the illustrations on Dormans web site,,,


I'd say the worst manifolds GM used on a small block were the ones on 267-305 engines in 78-84 Malibus and Caprices,they were "over" the spark plugs and very restrictive--I think they also had a strange 5 bolt mounting pattern also..probably of no use to us 4x4 guys ,but they used those on El-caminos and other G body cars..

I'd use whatever I have on hand that works when I'm building something--I dont have a lot of cash to spend to keep my trucks alive,so whatever I have gets used up or whatever I can scrounge up free or cheap is often all I have at my disposal...I think a lot of the older stuff was built better and designed better--I'd have no fears of using ram horns on a truck whether it was a 67 or an 87...
 
Are there any dyne tests out there that show more performance with the ram style over the log style?
 
COCHEV said:
Are there any dyne tests out there that show more performance with the ram style over the log style?
Click to expand...

I just did a quick google search and came up with this. It compares ram horns vs headers on a 383 that was going into a Impala. Its not the best comparison for our trucks but its something I guess.

I to would be interested to see dyno test of ram horns vs. normal style manifolds. I have no clue if they flow better or not. That is just what I have always heard and if you do some research on the internet a lot of people really seem to like them :dunno:. Thats what got me thinking about them.

http://www.impalas.net/forums/showthread.php?t=4901
 
diesel4me said:
I looked up the ram horn manifolds in a friends Dorman catalog,they sell both styles new now--I was mistaken about the drivers side only having the angled outlet--they BOTH were angled on the 67-72 trucks,the passenger car ram hotns were a straight outlet on both sides in most applications,but some models did have a angled outlet on the drivers side also...I wasnt able to copy the part numbers down ,as my friend was in a rush to close up right after I got to his shop...but you can likely see the illustrations on Dormans web site,,,


I'd say the worst manifolds GM used on a small block were the ones on 267-305 engines in 78-84 Malibus and Caprices,they were "over" the spark plugs and very restrictive--I think they also had a strange 5 bolt mounting pattern also..probably of no use to us 4x4 guys ,but they used those on El-caminos and other G body cars..

I'd use whatever I have on hand that works when I'm building something--I don't have a lot of cash to spend to keep my trucks alive,so whatever I have gets used up or whatever I can scrounge up free or cheap is often all I have at my disposal...I think a lot of the older stuff was built better and designed better--I'd have no fears of using ram horns on a truck whether it was a 67 or an 87...[/quote]

Thanks for the info and going outof your wy to look at your buddies manuals diesel4me that is helpful and very kind.

And to your point that I bolded out above........I could not agree more. Thats what kind of led me to the ram horn idea. See the manifolds that are on my Jimmy know are both cracked and need to replaced. I will not put cheap headers on it and $500.00 plus for a good set is not in the budget, plus the engine is bone stock. So manifolds it is. So in doing research I have found that people really seem to like the ram horns on their trucks. And as far as I can tell they are cheaper than the the normal log style manifolds any way.
Click to expand...
 
If you have HEI, then you can get a set of spark plug wires for a 75 corvette, they are plenty long enough to go under the ramhorn manifolds. Other than flow, I have no idea but run them on 2 of my trucks
 
bigbadchev84 said:
If you have HEI, then you can get a set of spark plug wires for a 75 corvette, they are plenty long enough to go under the ramhorn manifolds. Other than flow, I have no idea but run them on 2 of my trucks
Click to expand...


I do have HEI..........thanks for the tip.

What year trucks are you running them on and do you have te angled or straight dump?
 
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