Re: Rams horn exhaust manifolds
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Re: Rams horn exhaust manifolds
I ditched my ram horns for some hooker headers & have had 0 yes ZERO problems with leaks or spark plug burning.
As Todd said, I too was having heating issues, cant truly pin it on the exhaust, but I made the change to headers & added a tranny cooler and my heating problems went BY BY. no more over heating when driving down the high way. I'm also running a modified 327 so the 4000 - 6200 rpm range is quite often a norm for me when I'm enjoying the truck on the weekends!!! |
Re: Rams horn exhaust manifolds
whats the best way to clean these things minus sandblasting?
rusty stock ramhorns? heard of people puttin' em in vinegar or something... Thanks!!! Glad to hear ramhorns ftw! lol headers are more $ lol |
Re: Rams horn exhaust manifolds
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Re: Rams horn exhaust manifolds
Porcelainizing will last forever as long as you don't hit it with anything hard like a tool.
Ray |
Re: Rams horn exhaust manifolds
Vinegar is an excellent rust remover - just dunk & wait a few days. Then remove, shake & dunk in baking soda & water to kill the vinegar acid. Dry immeadiately & coat to prevent flash rust.
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Re: Rams horn exhaust manifolds
So where can I get a few gallons of vinegar lol, walmarts?
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Re: Rams horn exhaust manifolds
I would buy them new, its not worth the energy to work on them and then it cracks or whatever.
Smitty |
Re: Rams horn exhaust manifolds
haha i'll leave em rusty before i buy new ones...Im on a budget here lol..
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Re: Rams horn exhaust manifolds
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In my opinion, unless you are having a NASCAR exhaust specialist building you a custom set of exhaust manifolds for YOUR truck, I'd stick with rams horns. And oh by the way, if you stick with stock rams horns you can order a COMPLETE exhaust kit shipped to your door from Heartthrob exhaust via LMC for around $200. On one hand: Flows as good or probably better then headers, no burnt wires, leaks, headaches, $200 to complete the pipes out the back. On the other hand: A ton of money, tons of leaks, tons of headaches, custom (expen$ive) exhaust to finish it off. No brainer. Quote:
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Re: Rams horn exhaust manifolds
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I put my truck to work, and I just want the least amount of headaches while maximizing the performance. That's why I ordered the Thorleys, but it seems like it's hard to get them these days. I also don't want massive amounts of heat in the engine compartment, and I have a large PTO hydraulic line running against the frame on the passenger side. So I'm thinking that keeping the ram horns (and maybe having a local machine shop port them) is a better shot. Things happen for a reason and I'm thinking that my bad experience with ordering Thorleys is telling me something... Quote:
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I'm not gonna say manifolds of any kind flow better than long tube headers. That's the science of fluid dynamics. What can be said is that some headers (ie: shortys and cheap headers) may not flow any better than ramhorns. The issue is finding a GOOD header that drops in on these trucks without ANY problems. Quote:
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Thanks for the feedback. |
Re: Rams horn exhaust manifolds
I'm piggy backing on this old thread. I need to replace my broken Rams Horn. The GM casting number is 3797942 (A 63-65 327 Vette). I've gone to several places and no one has that number. They are suggesting 3797901or 3846563. So I can't find how to cross match. The port holes are 1 x 1.
I need a Rams Horn to match up with the 2 1/2 SS exhaust pipe. I'm running a Chevy 400cid. So does any one have: 1) A - 3797942 (drivers side LH) manifold? 2) How to reference these other numbers? 3) Where to buy a 3797942? ( If it references to the other numbers there are a ton of places) Thanks in advance. |
Re: Rams horn exhaust manifolds
Thoght i bought mine from dorman, ended up cutting off the generator mount, then it doesnt matter if you buy a right or left.....could be wrong on that
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Re: Rams horn exhaust manifolds
An attempt at the best of both worlds would be opening-up your manifolds. Not sure how much it costs, but you could extrude-hone them (don't look at this if you are eating):
http://www.gethoned.com/process.html |
Re: Rams horn exhaust manifolds
are ram horns also on I6 250 motors or just small blocks:devil: if so i need to replace mine, one of the bolts is cracked along the side and i have a slight leak..;:devil::devil:
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Re: Rams horn exhaust manifolds
Can these mainifolds be welded or otherwise repaired? I have a pretty good sized crack in one of my and a hairline crack in the other.
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Re: Rams horn exhaust manifolds
i scrapped all my crackedones...:(
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Re: Rams horn exhaust manifolds
Just looked at the Speedway stainless ramshorns - very nice. Two questions:
1) Is there anybody here using them in our trucks? 2) They are center-dump. Will they work with a sb in the stock location? http://www.speedwaymotors.com/Tru-Ra...301#tabcontent |
Re: Rams horn exhaust manifolds
I have these on my 383 They even had the right notch for my A/C bracket.
I recently found these results too. |
Re: Rams horn exhaust manifolds
OK I have found a few things. The Dorman part is 674-502 (2 1/2") and it does have the alt/gen bracket ($70). It might have to be cut off? I found a manifold at Stevens for $149. The dorman appears to have the same tube on the inside. What does that do???? The one from Stevens doesn't have it. Stevens said the hole is for a tube which is for a pre heat on the choke. He said "The holes are there but you won't have any exhaust leak"??? Isn't a hole a hole??? Unless the tube is inserted or the hole filled, won't exhaust leak?
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Re: Rams horn exhaust manifolds
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CORRECT on the hot air for the choke Actually,now that think about it, you don't even have to drill it |
Re: Rams horn exhaust manifolds
1 Attachment(s)
Are these the Ram horn manifolds you guys are talking about?
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Re: Rams horn exhaust manifolds
Yep! What size are the intake (square or round) and exhaust ports?
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Re: Rams horn exhaust manifolds
Not sure, never removed them from the engine. It's funny cause my Dad has been telling me "them are good manifolds, you want to keep them", my response to that is, heck no I'm getting rid of them and getting some headers first chance I get :lol: Now I am thinking maybe I should take his advice...LOL
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Re: Rams horn exhaust manifolds
I know this is an old thread but here is my take on the manifold/header debate. If your looking for 100% no mainetance system then manifolds are the only answer, but if you have a engine of any HP then you can be leaving as much as 50 hp on the table. Stock engines are not loosing with manifolds unless you have an 370 HP LT-1. Ram horns are the best of the SBC manifold hands down for performance. BTW the later log manifolds fit the 67-72 frame just fine, mine has them. Now if your willing to spend a little money along with sometime during oil changes and tune ups, then headers are not that big of a hassle. If the engine is over 350 CID and the cam has more than 220° duration at .050 along with everything to support an engine of this performance level then headers will have a gain most of the RPM range (not just above 3000). In a truck that actually works as a truck (tows and haul heavy loads) I would keep the ram horns (I also would build a 400 SBC that was under 220° and 9.0 compression) but a set of small headers would work. Headers will radiate heat faster and the tune needs to adjusted to suit the headers (this is why most complain about the header making the engine run hot). NEVER wrap the headers unless you like replacing headers alot, it will embridle the metal and they WILL crack (I know this cause I have worked with header company on warrentys). I have a 406 SBC in a Monte Carlo that was dynoed with ram horns (2 1/2" Corvettes ported) that put out 370 HP/420 lbs ft but after the engine was in the car the cast iron logs were tossed in favor of 1 3/4" primary 30" long 3" collector Hookers Super Comps. The car used to run 14.10 at 99 MPH, after the headers (along with a retune) Monte went 13.50 @ 104MPH (this 406 is out of steam by 5500 RPM) and the driveability is so much better with the headers. It is like anything else you need to descide how your going to use the vehicle and how much work your willing to do to achieve a level of performance.
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