Ebay/OBX style header install w/plenty of PICS (LONG, but detailed)
Jun 17, 2010 | 04:28 PM
#151
I didn't read the entire thread so excuse me if this has already been covered, but I wanted to throw out there that header primaries are measured outside diameter, not inside. So if they measure 1 3/4" outside, then that's what they are and why they are advertised as such. Folks can go measure their Pacesetters, ARH, Kooks, etc to verify that one. 
Jun 17, 2010 | 05:38 PM
#152
Think about it. How do you have a constant measuring stick across the spectrum of various header manufacturers if everyone uses a different thickness material for their tubing. Sure two companies may have the same o.d. of 1-3/4" but if the material thickness is different between them, then the i.d. will be different and the subsequent performance between them if used on the same engine will be varied.
Long story short, primary tube sizing should be according to the i.d. of the tube. So before anyone orders some headers, check to be sure.
When I used to play with SBC stuff, headers were called out according to their i.d. Newer gen headers shouldn't be any different.
Jun 17, 2010 | 06:29 PM
#153
I didn't read the entire thread so excuse me if this has already been covered, but I wanted to throw out there that header primaries are measured outside diameter, not inside. So if they measure 1 3/4" outside, then that's what they are and why they are advertised as such. Folks can go measure their Pacesetters, ARH, Kooks, etc to verify that one.
Jun 17, 2010 | 06:42 PM
#154
Do the OBX headers have bungs for o2 sensors? I can't tell by the pics.
Also, what are the negatives of tuning for LT's (I have shorties and catback atm) before actually installing them?
Also, what are the negatives of tuning for LT's (I have shorties and catback atm) before actually installing them?
Jun 17, 2010 | 06:58 PM
#155
For those who don't know, these headers are down to $290 shipped! Great deal IMO.
http://cgi.ebay.com/ebaymotors/ws/eB...:MEWAX:IT#shId
http://cgi.ebay.com/ebaymotors/ws/eB...:MEWAX:IT#shId
Jun 17, 2010 | 09:24 PM
#156
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The only negative I have come across is that longtubes (any brand) tend to cause the O2 sensor readings to be "slower" reacting due to being farther away from the cylinder heads. I simply "turned off" all of the slow response codes but they don't make a difference in how the truck runs anyway.
Jun 20, 2010 | 08:37 PM
#157
Yes, there's at least 6 bungs that can be used, so no extensions are needed. Screw your O2's into whatever bung that they're closest to.
The only negative I have come across is that longtubes (any brand) tend to cause the O2 sensor readings to be "slower" reacting due to being farther away from the cylinder heads. I simply "turned off" all of the slow response codes but they don't make a difference in how the truck runs anyway.
The only negative I have come across is that longtubes (any brand) tend to cause the O2 sensor readings to be "slower" reacting due to being farther away from the cylinder heads. I simply "turned off" all of the slow response codes but they don't make a difference in how the truck runs anyway.
Jun 20, 2010 | 08:46 PM
#158
Negative. Primaries are supposed to be measured using the i.d. for consistency from manufacturer to manufacturer. If some company is actually calling out o.d's, then shame on them because that is incredibly misleading.
Think about it. How do you have a constant measuring stick across the spectrum of various header manufacturers if everyone uses a different thickness material for their tubing. Sure two companies may have the same o.d. of 1-3/4" but if the material thickness is different between them, then the i.d. will be different and the subsequent performance between them if used on the same engine will be varied.
Long story short, primary tube sizing should be according to the i.d. of the tube. So before anyone orders some headers, check to be sure.
When I used to play with SBC stuff, headers were called out according to their i.d. Newer gen headers shouldn't be any different.
Think about it. How do you have a constant measuring stick across the spectrum of various header manufacturers if everyone uses a different thickness material for their tubing. Sure two companies may have the same o.d. of 1-3/4" but if the material thickness is different between them, then the i.d. will be different and the subsequent performance between them if used on the same engine will be varied.
Long story short, primary tube sizing should be according to the i.d. of the tube. So before anyone orders some headers, check to be sure.
When I used to play with SBC stuff, headers were called out according to their i.d. Newer gen headers shouldn't be any different.
Jun 21, 2010 | 02:27 PM
#159
Negative. Primaries are supposed to be measured using the i.d. for consistency from manufacturer to manufacturer. If some company is actually calling out o.d's, then shame on them because that is incredibly misleading.
Think about it. How do you have a constant measuring stick across the spectrum of various header manufacturers if everyone uses a different thickness material for their tubing. Sure two companies may have the same o.d. of 1-3/4" but if the material thickness is different between them, then the i.d. will be different and the subsequent performance between them if used on the same engine will be varied.
Long story short, primary tube sizing should be according to the i.d. of the tube. So before anyone orders some headers, check to be sure.
When I used to play with SBC stuff, headers were called out according to their i.d. Newer gen headers shouldn't be any different.
Think about it. How do you have a constant measuring stick across the spectrum of various header manufacturers if everyone uses a different thickness material for their tubing. Sure two companies may have the same o.d. of 1-3/4" but if the material thickness is different between them, then the i.d. will be different and the subsequent performance between them if used on the same engine will be varied.
Long story short, primary tube sizing should be according to the i.d. of the tube. So before anyone orders some headers, check to be sure.
When I used to play with SBC stuff, headers were called out according to their i.d. Newer gen headers shouldn't be any different.
Jun 21, 2010 | 02:29 PM
#160
sure they "should" be, but their not... Headers are made out of tubing and not pipe. Tubing is measured by the OD and Pipe is measured by the ID. Sure it would be nice for them to be measured and advertised by the ID since that is where all the flow is but it just makes things even more confusing. Especially for anyone working in an industry that deals with OD's and ID's day in and day out.