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Unread 12-16-2011, 09:54 PM   #1
Ripper3494
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different headers on v8 swap

since v8 swaps are in the list of advanced tech here i go... my issue is that on the drivers side i have a c6 corvette manifold, and thats all i can get to clear and put the pipe where i need it, and on the passenger side i have a v8 s10 conversion header and thats the only thing i can fit there without severe modification of the other corvette header.

my question is is it ok to run 2 different headers/manifolds, as long as i connect the pipes somewhere in the system it should be fine right?

s10 header


corvette manifold


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Unread 12-17-2011, 05:46 AM   #2
Poke
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Are the ID's the same at the flange end?
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Unread 12-17-2011, 07:11 AM   #3
oldtime_ironman
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It will work, but its not advisable on the Chevy V-8's. Reason why is that, the engine is expecting the length of the pipes to bethe same, as well as the diameter - different sizes will make it run kinda "lumpy" and rough feels almost like a race cam.
The headers affect how much air/fuel fills up the cylinders and stuff like that - you don't want one cyl to be rich and the other one to be lean. These engines flow differently depending on the header design - racers use then to tune the torque curve for ecample.

Rule of the thumb for chevy v8's is: you want all the header tubes to be the same length and diameter as much as possible. Ditto for the intakes..

So in this case you might be better off to try somethig else - take a look at this kit for example:
http://www.summitracing.com/search/S.../?autoview=SKU

With a kit like this and a few "generic" bends you should be able to get around anything - I saw a guy run his steering shaft right thru them once!
Hope that helps!
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Unread 12-17-2011, 09:21 AM   #4
jsawduste
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Iron man makes some good comments but there is a lot more to consider.
Depends on how deep you want the conversation to go.

Carb or FI ? What small block running what intake cam ?

This is all a conversation on volumetric efficiency. The engine is an air pump nothing more nothing less.

Consider the firing order of a SBC 18436572. As the numbers show, the balance is odd/even except for 5/7. The engine would react differently drawing from an open plenum intake vs. a closed plenum. Factor in a carb or different types of fuel injection. TBI MPI or Direct. Now throw the cam into the mix. Cam dynamics have a tremendous affect on VE and where it peaks. Not even factoring the heads into the equation but they too play an important part.

Bottom line, yeah it will work. How well is based on plenty of factors. With more information we can define "how well" a bit closer.
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Unread 12-17-2011, 09:22 AM   #5
Ripper3494
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Quote:
Originally Posted by Poke View Post
Are the ID's the same at the flange end?
yea, they're both 2.5in
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1994 yj stretched, locked and loaded - 6.0l vortec lq4, 4l60e, np231, Dana 44s 37" interco trxus m/t, 3.5" bds front leafs, double triangulated 4 link rear on xj front coils.
1997 ZJ limited - BONE stock
2003 tj - 4in skyjacker, 33" mickey thompsons
my on board alternator/welder write up
[url]http://www.jeepforum.com/forum/f12/alternator-welder-write-up-1301614/[/url]
my tj 1/2 doors on a yj write up
[url]http://www.jeepforum.com/forum/f12/tj-uppers-yj-half-doors-hard-top-installation-1417686/[/url]
RC vs BDS
[url]http://www.jeepforum.com/forum/f12/rough-country-vs-bds-1461555/[/url]
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Unread 12-17-2011, 09:24 AM   #6
Ripper3494
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i decided id work to run the corvette manifolds on both sides, so i moved the engine back a bit and took a grinder around the outside of the flange of the manifold, just enough to not screw with it sealing, but enough that it clears the engine mounts, thanks for the replies.
i really wasnt comfortable running 2 different ones but its good to know if its absolutely neccisarry it is possible
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build thread:
[url]http://www.jeepforum.com/forum/f22/94-yj-6-0-build-spud-1218315/[/url]
1994 yj stretched, locked and loaded - 6.0l vortec lq4, 4l60e, np231, Dana 44s 37" interco trxus m/t, 3.5" bds front leafs, double triangulated 4 link rear on xj front coils.
1997 ZJ limited - BONE stock
2003 tj - 4in skyjacker, 33" mickey thompsons
my on board alternator/welder write up
[url]http://www.jeepforum.com/forum/f12/alternator-welder-write-up-1301614/[/url]
my tj 1/2 doors on a yj write up
[url]http://www.jeepforum.com/forum/f12/tj-uppers-yj-half-doors-hard-top-installation-1417686/[/url]
RC vs BDS
[url]http://www.jeepforum.com/forum/f12/rough-country-vs-bds-1461555/[/url]
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Unread 12-17-2011, 10:19 AM   #7
oldtime_ironman
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Quote:
Originally Posted by jsawduste View Post
Iron man makes some good comments but there is a lot more to consider.
Depends on how deep you want the conversation to go.

Carb or FI ? What small block running what intake cam ?

This is all a conversation on volumetric efficiency. The engine is an air pump nothing more nothing less.

Consider the firing order of a SBC 18436572. As the numbers show, the balance is odd/even except for 5/7. The engine would react differently drawing from an open plenum intake vs. a closed plenum. Factor in a carb or different types of fuel injection. TBI MPI or Direct. Now throw the cam into the mix. Cam dynamics have a tremendous affect on VE and where it peaks. Not even factoring the heads into the equation but they too play an important part.

Bottom line, yeah it will work. How well is based on plenty of factors. With more information we can define "how well" a bit closer.
X2. I would add, you can tweak the torque curve on the chevys a bit depending on the diameters and lengths. The smallest "normal" header you can get is usually 1-5/8 dia at the port flange. Good for bottom-end torque and smooth running. Crap for high HP and high RPM tho.

Most of the street rod guys go "middle-of-the-road" with 1-7/8 tubes.

Insane race-only guys go big like 2-inch and up. Remember, this is at the ports, not the collectors. The big pipes totally kill the low RPM crawl but you can rev to the moon OTOH.

On top of all this like jsawduste says, ita all gonna depend on your choice of cam and gearing, etc. It has to be a total engineered package to get the most out of the chevy. There's no point in putting a small cam with big headers, or a huge carb with a small cam, etc.

You have to figure out what RPM's you normally run at, and build everything else around that, including the gear ratios. Just sayin from having a lifetime of chevys... and then I got the jeep
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Unread 12-17-2011, 03:43 PM   #8
jsawduste
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Quote:
Originally Posted by Ripper3494 View Post
i decided id work to run the corvette manifolds on both sides, so i moved the engine back a bit and took a grinder around the outside of the flange of the manifold, just enough to not screw with it sealing, but enough that it clears the engine mounts, thanks for the replies.
i really wasnt comfortable running 2 different ones but its good to know if its absolutely neccisarry it is possible
Best decision
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Unread 12-20-2011, 10:43 PM   #9
AndrewBu
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exactly like old time said, one side will be rich and once side lean. that will make it a ***** to tune.
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Unread 01-07-2012, 04:59 PM   #10
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I just ordered some block hugger headers so i dont have any driveline interference maybe check those out

this is what i ordered
http://www.summitracing.com/parts/HOK-2100HKR/
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Unread 01-07-2012, 07:13 PM   #11
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Quote:
Originally Posted by youngjeepr View Post
I just ordered some block hugger headers so i dont have any driveline interference maybe check those out

this is what i ordered
http://www.summitracing.com/parts/HOK-2100HKR/
Thats what I run and put on the LS TJs I've done. Fit just right between the frame rails, still able to keep ample room for motor mounts, and don't cost much at all.
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Unread 01-12-2012, 08:03 PM   #12
EZAces
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They also make headers that will run the pipes on the out side of the frame.
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