eBay headers are 1-5/8” primaries Disclaimer: This applies to DNA Motoring/KOSpeed. I would like to verify other sellers if purchasers wouldn’t mind measuring and posting pics to this thread. I will also update this thread with sellers with true 1-3/4” primaries from eBay once getting confirmation from anyone who shares the info. 11/26/13: Speed Engineering are now 1-3/4" primaries: https://ls1tech.com/forums/generatio...available.html 6/7/13: Speed Engineering are currently 1-5/8" primaries:
Originally Posted by Speed Engineering
(Post 17458386)
The current ones it looks like are the same dia. as other Ebay headers. We never measured them previously. 7/1/13: PaceSetter are indeed 1-3/4" see post 91 I purchased a set of eBay stainless long tubes from seller KOSpeed (kospeed2008; part number HDS-CC98LS1). KOSpeed is DNA Motoring. The shipping label, email, paypal, etc. all said DNA Motoring. I’m guessing KOSpeed is simply another account they use to sell even cheaper (I paid $182). Based on the information someone had mentioned in another thread (https://ls1tech.com/forums/17447366-post39.html), I decided to measure to ensure these really were a 1-3/4” primary. Unfortunately, I determined they are actually 1-5/8” primaries. They are also 15g steel (at 3.002 OD and 2.862 ID, that leaves us at 0.14/2= 0.07" or 14g; info from http://www.engineersedge.com/gauge.htm) These are advertised as “1.75-inch inlet” – which is true. Unfortunately, that doesn’t mean that is the primary size. What it appears is happening is they are taking the 1-5/8” primaries and expanding them to 1-3/4” “inlet” at the weld to the header flange. Below are pictures of all of the findings. I hope this might help people to determine if they really want to save the money going with the eBay longtubes. I’d implore anyone who has purchased a set to measure your primary tubes rather than the inlet to verify diameter. I’m interested to know how many have put these 1-5/8” headers on and the gains they noticed. KOS/DNA has been prompt in sending a RMA so these can go back. Unfortunately, I'm out $60 for the return shipping. I would try and fight it, but nowhere does it mention these are 1.75” primaries – only 1.75” inlet. At the very least, I'm hoping this is my financial contribution to save someone else some money! OD of primary (random spot) appx. 1-5/8”: http://imageshack.us/a/img855/9060/primaryod2.jpg OD of primary near collector appx. 1-5/8”: http://imageshack.us/a/img29/5941/primaryod1.jpg Gaskets and studs: http://imageshack.us/a/img802/6011/gasketstud.jpg Bungs on outside of collector: http://imageshack.us/a/img51/870/bungs.jpg Inside of collector: http://imageshack.us/a/img825/4380/collectorh.jpg OD of collector is 3”: http://imageshack.us/a/img69/1247/collectorod.jpg ID of collector is appx. 2-7/8”: http://imageshack.us/a/img546/2702/collectorid.jpg Now the primaries… Inside at flange (notice the flare): http://imageshack.us/a/img42/5765/inletp.jpg Outside at flange (notice the flare): http://imageshack.us/a/img163/6164/flangep.jpg ID of flange at the flare appx. 1-13/16”: http://imageshack.us/a/img195/3941/flangeid.jpg OD of flange at the flare appx. 1-3/4”: http://imageshack.us/a/img703/6493/flangeod.jpg |
Thanks for posting this. For anyone that wants to know this stems from a thread about ebay headers located here.... https://ls1tech.com/forums/generatio...-new-post.html Some poeple say all ebay headers are the same, though I tend to doubt that. I do not believe there are tons of people manufacturing them, but two or three seems realistic at this point. Pictures speak VOLUMES so as speed demon said, if anyone else has a set that seems more legit please post pics and let us know. Thanks! |
Are those the headers that are like $190? |
Originally Posted by KCS
(Post 17456207)
Are those the headers that are like $190? |
Don't have any pic but when I got mine they measured fine I will see if I can find out who I got mine from as it was a few years back |
I've got a few year old set on my car - and it's been 123mph on the motor and 131mph on the gas. They work good for the price :) |
Mine were the 1 5/8 and my 2000 ws6 a4 with factory stall and gears with only bolt on's made 345rwhp and 353rwtq on two different dyno's, so they worked for me, they're probably nothing I'd put on a bigger build, but for a budget and small build they worked perfect for me! When I sold the car they still looked shiny and nice |
Originally Posted by ds98formula
(Post 17456409)
Don't have any pic but when I got mine they measured fine I will see if I can find out who I got mine from as it was a few years back
Originally Posted by nocooler
(Post 17456460)
I've got a few year old set on my car - and it's been 123mph on the motor and 131mph on the gas. They work good for the price :)
Originally Posted by AmarilloWS6
(Post 17456510)
Mine were the 1 5/8 and my 2000 ws6 a4 with factory stall and gears with only bolt on's made 345rwhp and 353rwtq on two different dyno's, so they worked for me, they're probably nothing I'd put on a bigger build, but for a budget and small build they worked perfect for me! When I sold the car they still looked shiny and nice |
Opinion Racing was the brand had to do some digging lol. I do not have any pictures but I did measure them when they went on. I can measure them on the car if you like for outer diameter |
Does this apply to the speed engineering headers? Also obviously on a bigger build this will have an impact but on a car that is ptp tb, ls6 intake, lid, catback and ory would it have a big impact or one at all? |
^^^you should be fine I am using them on a cam set up not speed daddy but eBay headers. I put down some pretty good numbers. 373/371 that's with out ported tb, pulley, and with a very poor homemade y pipe. |
You guys keep taking about the times you ran with them, and the numbers you put down. That's fine and dandy if you're content. The point is though there's more power to be had with a larger primary. OP, nice to see someone take the time to CALIPER the headers and post good pics. |
Originally Posted by dr_whigham
(Post 17457981)
You guys keep taking about the times you ran with them, and the numbers you put down. That's fine and dandy if you're content. The point is though there's more power to be had with a larger primary. OP, nice to see someone take the time to CALIPER the headers and post good pics. |
Originally Posted by ds98formula
(Post 17458049)
Wile this is true for under 200$ shipped its a great budget. You can take the money saved and put it somewhere for bigger gains. I will change mine out eventually to bigger ones but that will be after heads and everything else is done. Also for people with a budget they can not be beat |
Yeah, I would expect this out of a $200 header. I mean hell, it's $200! LOL |
Originally Posted by ds98formula
(Post 17457418)
Opinion Racing was the brand had to do some digging lol. I do not have any pictures but I did measure them when they went on. I can measure them on the car if you like for outer diameter
Originally Posted by black79transam
(Post 17457524)
Does this apply to the speed engineering headers?
Originally Posted by dr_whigham
(Post 17457981)
OP, nice to see someone take the time to CALIPER the headers and post good pics.
Originally Posted by ds98formula
(Post 17458049)
Also for people with a budget they can not be beat |
Originally Posted by black79transam
(Post 17457524)
Does this apply to the speed engineering headers? |
Originally Posted by demonspeed
(Post 17458501)
Just found out Speed Engineering are also 1-5/8" primaries: https://ls1tech.com/forums/17458386-post76.html |
Will this really make a difference? I was gonna do speed's headers but am alittle worried not. I'm not really in the position to buy TSP's right now. |
This makes a difference when you currently have a 1 3/4" header and want to upgrade to a larger primary like a 1 7/8" header. Too many people post that they are selling a 1 7/8" header because they measure the header flange opening, which is a universal piece that everyone uses to build their headers, but it's the actual primaries that make the difference. Sure, for a stock bolt on, even a head cam car, the differences are probably minimal, but for me, I've got a set of killer heads, decent cam, and a procharger pushing 15psi of boost so I need the larger primaries for my application. |
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