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Old January 8th, 2012, 07:15 PM   #1
kyl_maxwell
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Default headers vs. manifolds

I picked up a set of cheapo headers (free) and was wondering if it was worth the time and lil bit of money involved in putting them on will it make a noticable difference or are the stock manifolds doing me fine?
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Old January 8th, 2012, 07:17 PM   #2
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What kind of engine? Whats been done to the engine?
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Old January 8th, 2012, 07:17 PM   #3
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headers all the way. I picked up a set for my lebaron a few years ago and I will say they made a huge differance
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Old January 8th, 2012, 07:18 PM   #4
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Originally Posted by High Center Hancho View Post
headers all the way. I picked up a set for my lebaron a few years ago and I will say they made a huge differance
Was it turbo?
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Old January 8th, 2012, 07:29 PM   #5
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Only if it was a convertible.
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Old January 8th, 2012, 07:32 PM   #6
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It's basically a stock 350 guy that I bought it from said it has a small cam in it but idk, also has a edelbrock performer intake and edelbrock 650 carb
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Old January 8th, 2012, 07:40 PM   #7
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They are probably good for 10-15 horsepower on a stockish engine.
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Old January 8th, 2012, 07:51 PM   #8
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Depends on the condition of the headers, if they look good I would do it, But if they look like they are rusty or weak in anyway, toss them.
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Old January 8th, 2012, 07:56 PM   #9
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They have surface rust they have been sitting around a while
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Old January 8th, 2012, 08:18 PM   #10
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Headers can sometimes cause underhood temps to increase.
The thick casting of the manifolds helps to retain and distribute the heat, where with headers it tends to transfer to the air in the engine bay much quicker.

Just something to keep in mind for summer,
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Old January 8th, 2012, 08:39 PM   #11
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And don't wrap mild steel headers either. I've had one grenade on me.
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Old January 8th, 2012, 08:42 PM   #12
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Quote:
Originally Posted by Sandals View Post
Headers can sometimes cause underhood temps to increase.
The thick casting of the manifolds helps to retain and distribute the heat, where with headers it tends to transfer to the air in the engine bay much quicker.

Just something to keep in mind for summer,
agree with this.....

my old K5 was fine with manifolds.......til i went long tubes and would get so damn hot starter would have issues cranking hot.

--Between rotting out quickly
--constant leaking
--hot as hell underhood temps
--harder acess on spark plugs(some sbc headers)
--headers are easily damaged on trucks.....(i had a large branch fling up and bent the hell out of the collector......

Ill stock with manifolds unless im building a badass motor...
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Old January 8th, 2012, 08:48 PM   #13
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leeking headers suck ass.

But they sound cool.

If you decide to put them on, mount them with socket head cap screws.

This will help with access to bolt them up.
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Old January 8th, 2012, 09:13 PM   #14
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They arnt the big long ones these dump out only about 4 inches further down then the manifold
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Old January 8th, 2012, 09:16 PM   #15
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They look like the ones they would give you for a v8 swap in an s10
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Old January 9th, 2012, 06:05 AM   #16
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Total waste of your time other than the bling factor.
-more under hood heat
-expect exhaust leaks
-tend to rot out quickly
-need to modify exhaust to fit (probably)
-no noticeable performance increase
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Old January 13th, 2012, 08:25 PM   #17
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Quote:
Originally Posted by Sandals View Post
Headers can sometimes cause underhood temps to increase.
The thick casting of the manifolds helps to retain and distribute the heat, where with headers it tends to transfer to the air in the engine bay much quicker.

Just something to keep in mind for summer,

also keep in mind if its a single wire O2 sensor they use the heat contained from the manifolds to stay warm. it won't read right with headers.
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Old January 13th, 2012, 08:28 PM   #18
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Quote:
Originally Posted by skife View Post
also keep in mind if its a single wire O2 sensor they use the heat contained from the manifolds to stay warm. it won't read right with headers.
That's not quite correct. Even with long tubes you can mount the sensor in the collector and it keep it up to temp. It takes a couple minutes for it to get to temp on a cold start but after that it's just fine.
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Old January 14th, 2012, 09:24 AM   #19
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Quote:
Originally Posted by mcampau View Post
That's not quite correct. Even with long tubes you can mount the sensor in the collector and it keep it up to temp. It takes a couple minutes for it to get to temp on a cold start but after that it's just fine.

just going with what i read, its not hard to upgrade to a 3wire o2 sensor though.
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Old January 14th, 2012, 03:17 PM   #20
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ok well i guess im the only one that feels this way but EVERY vehicle ive owned 78 c10 bbc, 75 c10 bb and sbc, 6 camaros v8s v6s, s10 4.3, k5 BUILT bbc, 1.3 tracker, and soon to be a 98 ZJ i have and always will continue to put headers on them, i hate stock manifolds. maybe its just my preference, one i like have accesability to my spark plugs (some vehicles not an issue 4.0 for instance) ive ALWAYS noticed a small amount of change in power and mpg definately worth the time and more mods to the motor the bigger gain, my reasoning behind the header theory is if you compare a header port to a manifold port the manifold is substantially smaller, my theory is if its a bigger opening it will allow the exhaust to escape a little easier because it wont be constricted to such a small area inside the manifold. under hood temps, ive never noticed any real significant change, granted im not saying youll put long tubes on your sbc and gain 500hp and be able to pull wheelies. again this is just my .02 theorys nothing proven from books or anything along those lines, just my personal history i say HEADERS FTW!


also the leaking issue, if you install the headers correctly with proper gaskets you will NEVER have a leak. install the headers with good fel-pro or equivalent gaskets, brand new bolts with lock washers (or go to parts store and buy locking bolts i.e lock wire, extended lock washers) and run the vehicle for 20 minutes let it get up to temp AT IDLE, tighten bolts down, i do this 3 times on every vehicle and only have ever had one issue and found out it was because of a bent flange
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