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eBay headers are 1-5/8 primaries

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Old 06-11-2013, 04:45 PM   #61
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anybody have any info on the BBK headers ??
Yes, they're a cost effective option if you don't mind a 2.5" collector and Y pipe. Installation is a breeze.

Only thing I'll say, is I've yet to meet ANYONE who modded and eventually didn't want more power. I'd opt for anything with a 3" collector first, but that's just me.

The BBK's are a great value and fit and function well.
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Old 06-11-2013, 05:38 PM   #62
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I'm just commentary, hoping to point out that if you buy some no name eBay parts in a very competitive market and it's priced well under what other Chinese manufactured parts are, then you shouldn't expect very much at all...as you may have learned.
I've expected simply what everyone else has expected -- 1-3/4" primaries. I understand your schtick, but the fact of the matter is people have been proclaiming the virtues of these headers without knowing they were running 1-5/8" primaries. Just as my thread title states, this is merely to let everyone know that "eBay headers are 1-5/8" primaries" -- that is, the savings aren't just from thin steel, word of mouth advertising, and Chinese origin. No whining (remember, I "paid" to bring everyone this info), just matter-of-fact tech data.

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Yes, they're a cost effective option if you don't mind a 2.5" collector and Y pipe. Installation is a breeze.
That's the only reason I skipped the BBK. I had good luck with them "back in the day" on my [old school] 5.0, but 2.5" collectors won't cut it.
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Old 06-11-2013, 08:37 PM   #63
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Originally Posted by omc8 View Post
What is the gauge of the tube wall. Have you measured it? If its presently 16, and they go to thin wall 18ga on there new race version then they will flow very close to 1 3/4 . They can keep the the same OD , but by going to a higher gauge they will be increasing the ID and they will flow close to 1 3/4 But the end result is a cheaper product .
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Awesome! Thank you!



Unfortunately, I measured everything except the wall thickness; however, it was certainly thin compared to anything I've seen with the name-brand headers (as is obvious in the pictures). So, even if Speed Engineering says theirs is also thin-wall and will flow close to a 1-3/4" primary, it's still the same, inexpensive Chinese 1-5/8" stainless that their eBay competitors are selling for a lot less (that they're advertising as a 1-3/4" - which it isn't).

At the end of the day, we need to determine the honest size of the primaries and the gauge of steel they're using. This it the only way to compare the brands at this point since now even a sponsor is advertising 1-3/4" primaries that are actually 1-5/8". I'd love for someone to measure their TSP primaries...

EDIT: I should have thought about this before, but we can determine the gauge because I measured the OD and ID of the collector. At 3.002 OD and 2.862 ID, that leaves us at 0.14/2= 0.07" or 14g.
Thanks for updating us with the wall thickness. Im little surprised that they are 14 ga , I was going to guess that they would have been closer to 16 ga. It will be interesting, if the Chinese ebay headers ever come up with a header that is egr delete , with the bungs in the correct position and a true 1 3/4 or 1 3/4 stepped to 1 7/8 at a price point of say $200 or $220 If they could do that they would have my attention.
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Old 06-11-2013, 08:44 PM   #64
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would you mind checking for us
Ill post results possibly sometime this weekend when i redo my manifold gaskets.
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Old 06-12-2013, 08:18 AM   #65
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Quote:
Originally Posted by omc8 View Post
Thanks for updating us with the wall thickness. Im little surprised that they are 14 ga , I was going to guess that they would have been closer to 16 ga. It will be interesting, if the Chinese ebay headers ever come up with a header that is egr delete , with the bungs in the correct position and a true 1 3/4 or 1 3/4 stepped to 1 7/8 at a price point of say $200 or $220 If they could do that they would have my attention.
Check out Speed Engineering's thread... they're listening to what's been unfolding with the new info

https://ls1tech.com/forums/generatio...ailable-5.html

edit: I've learned some more about metal thickness: http://www.engineersedge.com/gauge.htm

We really need to find out what the name brands measure for an accurate comparison.

Last edited by demonspeed; 06-12-2013 at 12:24 PM.
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Old 06-12-2013, 04:52 PM   #66
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Just checked the OBX headers I got in today, they're true 1-3/4" OD primaries.
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Old 06-12-2013, 04:58 PM   #67
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Just checked the OBX headers I got in today, they're true 1-3/4" OD primaries.
LOL, and how much more did they cost?
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Old 06-12-2013, 05:06 PM   #68
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LOL, and how much more did they cost?
$550 for headers and y-pipe, shipped.
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Old 06-12-2013, 06:00 PM   #69
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$550 for headers and y-pipe, shipped.
Certainly not a bad deal.

However if one is truly pinching pennies, $182 (shipped) for 1-5/8" long tubes and $148 (shipped) for Speed Engineering Y... $550>$330. $220 can buy some other things, wouldn't you agree, Know_It_All?
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Old 06-12-2013, 07:10 PM   #70
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Very cool and not doubting you, but pics of measurements would be AWESOME! make it happen brother.
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Old 06-13-2013, 01:55 AM   #71
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My caliper is old school analog dial
Not one self respecting machinist has a digital caliper. Period. Those are for the guys who buy the WorxGT trimmers and Kobalt DualDrive screwdrivers.
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Old 06-13-2013, 09:16 AM   #72
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Not one self respecting machinist has a digital caliper. Period. Those are for the guys who buy the WorxGT trimmers and Kobalt DualDrive screwdrivers.
This is probably your best contribution to this thread. Honestly, I paid $30 for my Kobalt digital calipers. Some may scoff saying that's a lot of money to measure stuff, but it's a precision measuring device -- and a cheap one at that. To buy a dial caliper that's certified is going to run ~$200 for just a mid-range.
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Old 06-13-2013, 08:47 PM   #73
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This thread needs to stay on track. Keep it informative and on topic, and refrain from any personal attacks or useless banter. We don't welcome such behavior, especially in a tech section in regards to a tech topic.

I've already deleted several replies that were inappropriate or just off-topic. If the thread continues to go downhill with personal attacks and such, I'll simply delete/prune all replies that are not on topic starting with the earlier pages of this thread.

Please do not repost any reply that is pruned or deleted. Doing so may result in suspension of posting privileges.

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Old 06-18-2013, 08:49 AM   #74
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fizzle................................
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Old 06-18-2013, 08:52 AM   #75
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I still wish people with other eBay brands would measure with calipers and post their findings. Perhaps they're not because they're finding 1-5/8" primaries
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Old 06-18-2013, 09:09 AM   #76
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Well i will eventually I don't have a working caliper though
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Old 06-18-2013, 09:10 AM   #77
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Well i will eventually I don't have a working caliper though
You get a pass because I don't think your brand exists anymore
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Old 06-18-2013, 10:23 AM   #78
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Yeah I don't see it anymore but I still wanna do it just to see. I think what you got going on in here is awesome info for people
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Old 06-18-2013, 10:28 AM   #79
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I would still like to see someone measure name brand too
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Old 06-18-2013, 10:36 AM   #80
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I would still like to see someone measure name brand too
Agree.
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