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Old 11-11-2009, 06:12 PM
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headers??? whats so good about headers, compaired to stock exhaust manifolds?

I was talking to a few people about exsaust on here but the headers that we were talking about are about $2000 , so what is the bigg differance? The headers look alittle differant, but pretty simular. I just put a new muffler on the truck, 92 suburban, 350 5.7L. And another qestion, what can you use to take off old spot welds, I had camps and 1 inch spot welds, and I cutt them out with a chizel and a heavy hammer. But there has to be a easier way! Just looking for some knowlage, and a little advice. p.s.
could I go dual with stock exsuast manifold?
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Old 11-11-2009, 06:44 PM
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headers have individual runner (primaries) that maintain a smooth flow of exhaust then flow into a collector that connects to your exhaust pipe. The stock manifold is generally a log style manifold has all the exhaust ports flow into a small chamber that exits out the rear of the "log" or chamber that goes to the down pipe that then connects to your exhaust pipe. Different primary length and sizes can change the torque curve as does the collector.

If you think of your exhaust less like a gas and more like a fluid it is easier to understand how flow can help your power. It you hook an water fosset to a straw it will come out it lots of volicity and pressure but you are limiting its ability to flow max volume (chocking it) If you have the same fosset and attach a fire hose it will flow max volume but with little volicity and pressure(no power).

Take a look and see what Jegs or summitracing has for your truck. The only problem with cheap headers are the cheaper materials used. Thin flanges can warp and cause constant exhaust leaks. Headers also have a shorter life than stock manifolds they can last for years but will rust out before cast iron monifolds. I bet you can find something less than 2 grand that are still quality parts. Sanderson, Doug Thorley, and Hooker header are all good. I have had a bad experience with dynomax Black Jack header.
A small die grinder with a cut off wheel works pretty well.With a 1 in bead a dremel may take a while and burn through a couple ends but can be done.

If you have 2 exhaust manifolds you can have true duals pretty easily if you have the room under your vehicle. For example, 80's cameros are tough to get good ground clearance. Your suburban shouldn't have a problem. An X pipe, which is a pipe that flows exhaust from one pipe to the other cause a scavenging effect, help build power while toning down the exhaust note and drone.

Last edited by sam_bo3; 11-11-2009 at 06:56 PM.
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Old 11-11-2009, 09:14 PM
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Summit Racing has headers for your Suburban starting around $250. If you're paying $2000 for headers they better but solid gold!

An engine is an air pump. The easier you can get air into and out of the engine the more efficient it is. Headers and dual exhaust will give you more bang for the buck than any other modification. Its that simple.
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Old 11-12-2009, 08:07 AM
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Quote:
Originally Posted by Centerline
Summit Racing has headers for your Suburban starting around $250. If you're paying $2000 for headers they better but solid gold!
.
That's what I was thinking, I'd like to know which ones cost that much.

Vince
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Old 11-12-2009, 08:46 AM
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Quote:
Originally Posted by bigno09
what can you use to take off old spot welds
Google "spot weld cutter" and see the results- a chisel isn't too much fun, but if they are too big to deal with them by using a cutter, that may be your course of action!

But be sure the welds are actually welded 1", the metal may distort but the spot weld can be smaller than the pock mark the spot welder leaves.

A die grinder and/or cut-off wheel also comes to mind, depending on your circumstances. Don't forget eye and ear protection.

Good luck.

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Old 11-12-2009, 09:18 AM
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take your pick.. http://www.summitracing.com/search/D...?Ns=Rank%7cAsc
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Old 11-12-2009, 03:22 PM
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Occasionally, it is also easier to buy headers then replacement manifolds. Like, let's say you have a true Pontiac motor and both your manifold-pipe flanges are broken. No way you'll find a true Pontiac in a junk yard around...say...Baltimore where cars rust at break-neck speed.

For the same price as fresh manifolds you can get Hooker "Comp" headers which have nice thick flanges. I opted for the ceramic coated ones cause they look cool.

-J
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Old 11-12-2009, 03:34 PM
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Stainless headers for my toy was like $299 off ebay.. will never rust, nor rot out. Show polish, but that only lasts a few minutes till they are rainbowed.

Headers, but the way they are made with the collector, they "BLOW" across the other tubes applying a vacuum to them helping suck the exhaust gases out.

Cross over pipes behind them collectors add torque.. I still ain't figured out why..

I did however throw a tin foil ball one time into a set of headers.. it fluttered up and back around inside the collector till I revved the engine and shot it out..

Sealing them headers are a pain.. they come loose from the heads and gaskets on most of them blow.. I've soaked them in water *white gaskets.. cut the flanges between the pipes.. milled the gasket side level.. I seem to remember the last set I bought was already milled flat.

They make it interesting to change sparkplugs.. sometimes it requires a boxed end wrench cut off short.
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