LS2 header info

[SturdyHSV]

In light of the very attractive group buy ringram is organising ( here: https://www.facebook.com/photo.php?fbid=1015270641... ) I was forced to go off and do some research into header sizes. I've looked into this before and I'll almost certainly look into it again in the future, as it's a reasonably complicated balancing act, is packed full of conflicting opinions and apples to oranges comparisons, and final decisions have to be based on your power level, future plans, budget and the other components you're working with (or going to be working with...) in your engine.

For the moment, I thought I'd just dump some of the more interesting articles / threads I've found so you can form your own opinions. As is often the way with car parts, finding somebody who buys a shiny new part then goes nope, that was a mistake and made it worse, I'm a mug who has wasted their money is fairly difficult, so finding decent comparisons is hard.

Good summary, although geared towards far bigger engines than ours. You can't see the graphs, but the tests they refer to are covered in the next link I'll post

https://www.centuryperformance.com/forum/showthrea...

Another good one, with the graphs referenced in the previous article

http://www.sandersonheaders.com/Lets-Get-Technical...

Good summary of info here, with an alternative rule of thumb to use for calculating header primary diameter based on the exhaust valve size/flow

http://www.popularhotrodding.com/tech/1111phr_how_...

Presumably not mopar specific, has a good table with lots of figures in for different engine sizes, which are always good for getting a feel of things.

http://victorylibrary.com/mopar/header-tech-c.htm

A good forum thread that then turned me towards possibly the best article I've found on the matter.

http://www.ls1gto.com/forums/archive/index.php/t-1...

And now, the apparent holy grail, actual like for like comparisons with the only change being the thing they're bloody well testing... So same engine, same header manufacturer, same header style, only the diameter changes. All with a nice list of the results.

http://www.carcraft.com/techarticles/116_0312_exha...

I shall possibly add to this more in the future as I find more stuff, you're welcome to as well of course, I just thought it'd be good to share some of the possibly more clear cut information so we don't all have to wade full page after page of forum arguments and evidence free opinion shouting that always greets you after a google search for header sizes...

[ringram]

LS1tech and Texasspeed show gains even on a stock LS1 from 1-7/8 headers and they are not the only ones.

[SturdyHSV]

ringram said:

LS1tech and Texasspeed show gains even on a stock LS1 from 1-7/8 headers and they are not the only ones.

Texas speed who make and sell headers?

But no, I'm sure they do, I've just been trying to find decent comparisons that were like for like, for example one of the LS1Tech 1 3/4 vs 1 7/8 comparisons was with old 1 3/4" from one brand and new 1 7/8" from another, so still open to arguments about primary length / design etc.

As it's the internet, it's always easy to find a forum thread to back up either side of the story, so for example here's a 1 3/4 is better thread on LS1Tech

http://ls1tech.com/forums/generation-iv-external-e...

It's all about power levels, engine size, rpm for peak torque etc., hence why I was just trying to give some of the more clear cut looking information I managed to dig up. It could still all be well off and biased of course, and it's expensive to test these things out for ourselves

For balance, here's a forum who are more pro 1 7/8. Corvette owners seem to be more pro 1 7/8.

http://www.corvetteforum.com/forums/performance-re...

Edited by SturdyHSV on Tuesday 9th September 14:36

[SturdyHSV]

Interesting post

http://www.camaro5.com/forums/showpost.php?p=13680...

American Racing Headers apparently compared their own 1 3/4 and 1 7/8 and found the 7/8 better, but I've not dug this up yet to see. Asnthey're their own headers tjough, I'd assume the most expensive ones would always win...

[jameshsv]

SturdyHSV said:

Interesting post

http://www.camaro5.com/forums/showpost.php?p=13680...

American Racing Headers apparently compared their own 1 3/4 and 1 7/8 and found the 7/8 better, but I've not dug this up yet to see. Asnthey're their own headers tjough, I'd assume the most expensive ones would always win...

I will be getting 1 7/8 and selling my 1 3/4

[SturdyHSV]

jameshsv said:

I will be getting 1 7/8 and selling my 1 3/4

You've got long tubes on currently haven't you? Would be good to see before/after dyno

[jameshsv]

SturdyHSV said:

You've got long tubes on currently haven't you? Would be good to see before/after dyno

Yes m8 long tubes already fitted.But 1 7/8 will be fitted when I have a little power upgrade.

Edited by jameshsv on Thursday 11th September 20:09

[mikeyb1987]

jameshsv said:

Yes m8 long tubes already fitted.But 1 7/8 will be fitted when I have a little power upgrade.

Power upgrade?

[jameshsv]

mikeyb1987 said:

Power upgrade?

Only a little upgrade mikey.

[mikeyb1987]

jameshsv said:

Only a little upgrade mikey.

I look forward to hearing more at the AAS Newcastle meet

[ringram]

jameshsv said:

mikeyb1987 said:

Power upgrade?

Only a little upgrade mikey.

Nice

[willisit]

I didn't know that community existed. Joined.

I'd have no clue about headers (I mean, I know what they are.. that's it though) to know what I was doing here. I'd have to go ask the fish since I have a cat-back...

[jameshsv]

willisit said:

I didn't know that community existed. Joined.

I'd have no clue about headers (I mean, I know what they are.. that's it though) to know what I was doing here. I'd have to go ask the fish since I have a cat-back...

Thats ok most of us dont bave a clue we just talk good.

[jameshsv]

willisit said:

I didn't know that community existed. Joined.

I'd have no clue about headers (I mean, I know what they are.. that's it though) to know what I was doing here. I'd have to go ask the fish since I have a cat-back...

Thats ok most of us dont bave a clue we just talk good.

[jameshsv]

willisit said:

I didn't know that community existed. Joined.

I'd have no clue about headers (I mean, I know what they are.. that's it though) to know what I was doing here. I'd have to go ask the fish since I have a cat-back...

Thats ok most of us dont bave a clue we just talk good.

[SturdyHSV]

willisit said:

I'd have no clue about headers (I mean, I know what they are.. that's it though) to know what I was doing here

That's why I posted all the links, so you have a good bit of reference material should you wish to learn a little more