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Old 12-23-2008, 05:55 AM
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shorty headers any good

i have a 95 Chevy truck with a 350. Already have a cat back system. was thinking of getting a set of the headers that bolt right to your Exhaust with out any mods. however in my research into these matter some say these shorty headers are really no better than slandered manifolds. Nothing i have read are specific to this situation they are mostly talking about shorty headers for clearance issues. Just wondering if they are Worth messing with are not?

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Old 12-23-2008, 06:28 AM
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Quote:
Originally Posted by nskeeter99
i have a 95 Chevy truck with a 350. Already have a cat back system. was thinking of getting a set of the headers that bolt right to your Exhaust with out any mods. however in my research into these matter some say these shorty headers are really no better than slandered manifolds. Nothing i have read are specific to this situation they are mostly talking about shorty headers for clearance issues. Just wondering if they are Worth messing with are not?
you can pick up an 85-90 corvette manifold cheap and get just about the same as shorty headers.

Are shorty's any good. Too broad a question. Depends on your setup.
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Old 12-23-2008, 07:07 AM
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shorties

If you ar useing it as a daily driver I would stay with manifolds
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Old 12-23-2008, 07:52 AM
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on a stock 350 engine full length headers aren't worth that much, maybe 20hp and 30ftlb of torque over log style manifolds. With a "hotter engine" (bigger cam, more compression, better heads, better intake, ect) then headers help a lot more.

do a search on the web. Maybe 5 years ago, a chevy magazine did a write up where they compared 7 or 8 headers including shorties, block huggers, log manifolds, and full length. the shorties and block huggers split the difference between the the full length and log type manifolds. However, the cam was fairly big (compcam 292H). I remember something like a 50 or 60 hp gain with full length headers over the logs (don't quote me, look it up).

I would think shorties are worth around 10hp and 15 ftlbs on an otherwise stock 350. But can also lead to more exhaust leaks and certainly more exhaust noise.
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Old 12-23-2008, 08:06 AM
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shorties are good, but the biggest problem with your truck engine is the heads.TBI heads suck a fat one due to Half the intake runner being blocked off due to the swirl ramp put into the casting.
TBI

Real head..


sorry so big..lol But you can see the tbi head does nothing for power, best bet is a good set of vortecs and a vortec TBI manifold. then worry about the exhaust.
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Old 12-23-2008, 09:35 AM
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I go a different way... pretty much anything is better than manifolds. Shorties are a heap better than manifolds because they flow much better. Their short length however does limit their ability to maximize torque and low-rpm scavenging.

manifolds = suck
shorties = better
full-length = best
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Old 12-23-2008, 04:57 PM
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the truck is my dd. the only mods are cat back and msd coil, and a tbi spacer. vortec heads wold be nice buy i have a toy that those are going just trying to find a few bolt ons to get some extra horses. don't wont go into the motor. was thinking maybe some tbi upgrades maybe even some 1.6 rockers for a Little extra kick. this truck is the dd so it doesn't get a lot of the upgrade budget so it comes in small sprerts and can get the headers for around 150. and was thinking bight get a 10 to 15 hp gain.

Skeeter
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Old 12-23-2008, 06:18 PM
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headers

They will give you a little more HP but I think they are high maintenance as for as leaking and such, but thats just my opinion, I am just not a big fan of headers on anything but for the strip.
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Old 12-23-2008, 06:28 PM
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What is your truck doing now, that a 10-12% hp (best case) gain will do so much better?
For a truck, you want to improve torque. That means using a long tube header, if you want more torque.
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Old 12-23-2008, 06:55 PM
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agreed F-bird. If he's keeping the wheezy swirl port heads, the shorties are a mismatch to say the least.

Not to mention a big waste of money in my opinion. Bolt-ons won't do much of anything on a TBI. The heads, cam, compression, and TBI are all well-matched to the 200 hp. No magic external bolt on will make any really noticeable gains.

The $1000 you'll spend on external mods to get you 15 hp could be spent better elsewhere.
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Old 12-23-2008, 09:47 PM
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actually my engine runs very strong. when i got the truck it had 250 but the comparison was 15o psi for all 8. i think it Had to be swap out for a crate engine. just trying to ad a Little extra power with miner bolt ons and hopping that it could give me a Little better millage. 15 mph kills me even though gas is going down. it has a nv4500 and 4.11s i don't know why the original owners just did not get a 3/4 ton Any who it sounds like the headers are a wast so will probley just save my money are put it on the 4x4 that doesn't have to follow the dd rules.

Skeeter

Ps thank you guys for all the indor
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Old 12-24-2008, 10:18 AM
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Increasing the power will not decrease the fuel consumption.
The power of an engine is derived from burning fuel. Think about that.

Last edited by F-BIRD'88; 12-27-2008 at 02:14 PM.
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Old 12-27-2008, 08:58 AM
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if i remember right some the gmc had factroy headers, 1985 to 1992
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Old 12-27-2008, 10:10 AM
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as for as mpg and the headers, I could be wrong but from my understanding of Exhaust upgrades don't actually make power it frees power the engine already made. SO since the engine is technical not making more power it just had freed up power you could get better millage out of it.

Skeeter
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Old 12-27-2008, 12:04 PM
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Quote:
Originally Posted by F-BIRD'88
Increasing the power will not increase the fuel consumption.
The power of an engine is derived from burning fuel. Think about that.

??? Where you up al night before you wrote that? I think you were trying to say that when you increase the power fuel consumption can go up as well. Though i know you know that is not always the case, and in the best built street engines it is usally the opposite case.
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