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Author Topic: Help identify this CB750 4into1 header  (Read 552 times)

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Offline newday777

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Help identify this CB750 4into1 header
« on: May 22, 2025, 02:40:33 AM »
I bought this NOS 4into1 header at last week's Jap Bike Mike's Swapmeet and wondering what brand it is. There are no markings on it and the owner didn't know either. He had it advertised on marketplace as bought from a dealer in 2012.
Edit....
I don't need guesses. Just the facts backed up with pictures to compare please
« Last Edit: May 22, 2025, 05:17:51 AM by newday777 »
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline newday777

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Re: Help identify this 4into1 header
« Reply #1 on: May 22, 2025, 02:47:27 AM »
A couple pictures I took once back to my shop of the header and one with a muffler slipped on I already had that fits.
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline Mark1976

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Re: Help identify this 4into1 header
« Reply #2 on: May 22, 2025, 04:20:09 AM »
    Possibly an old Hooker, it's remarkably clean...
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Offline newday777

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Re: Help identify this 4into1 header
« Reply #3 on: May 22, 2025, 04:22:30 AM »
Quote from: Mark1976 on May 22, 2025, 04:20:09 AM
    Possibly an old Hooker, it's remarkably clean...
Thanks but.....
Definitely not Hooker headers.
I have those Hooker Header 4into1 on my K5 and they have individual pipes into the muffler having 4 holes for the pipes to fit into. I don't need guesses.
« Last Edit: May 22, 2025, 04:38:13 AM by newday777 »
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline Tim2005

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Re: Help identify this CB750 4into1 header
« Reply #4 on: May 22, 2025, 05:44:05 AM »
Have you seen this post? All the common ones are in there  http://forums.sohc4.net/index.php/topic,97959.0.html
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Offline newday777

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Re: Help identify this CB750 4into1 header
« Reply #5 on: May 22, 2025, 05:47:09 AM »
Quote from: Tim2005 on May 22, 2025, 05:44:05 AM
Have you seen this post? All the common ones are in there  http://forums.sohc4.net/index.php/topic,97959.0.html
Yes a couple years ago, and just went through it again.
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline BenelliSEI

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Re: Help identify this CB750 4into1 header
« Reply #6 on: May 22, 2025, 06:25:21 AM »
Gemini made “black” and “chrome” versions in California. One of the few that were permanently welded to the collector. Unfortunately I just sold this one to a friend, so only the one picture to compare.
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Offline seanbarney41

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Re: Help identify this CB750 4into1 header
« Reply #7 on: May 22, 2025, 06:33:33 AM »
Quite sure I know what it is, but you say no guessing, so I will keep it to myself.
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Offline newday777

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Re: Help identify this CB750 4into1 header
« Reply #8 on: May 22, 2025, 06:33:56 AM »
Quote from: BenelliSEI on May 22, 2025, 06:25:21 AM
Gemini made “black” and “chrome” versions in California. One of the few that were permanently welded to the collector. Unfortunately I just sold this one to a friend, so only the one picture to compare.
Those are different John,  they have softer bends.
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline newday777

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Re: Help identify this CB750 4into1 header
« Reply #9 on: May 22, 2025, 06:42:28 AM »
Quote from: seanbarney41 on May 22, 2025, 06:33:33 AM
Quite sure I know what it is, but you say no guessing, so I will keep it to myself.
You funny guy
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline Stev-o

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Re: Help identify this CB750 4into1 header
« Reply #10 on: May 22, 2025, 08:51:34 AM »
Quote from: newday777 on May 22, 2025, 06:42:28 AM
Quote from: seanbarney41 on May 22, 2025, 06:33:33 AM
Quite sure I know what it is, but you say no guessing, so I will keep it to myself.
You funny guy

I think I know too...but dont want to guess!!!
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline newday777

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Re: Help identify this CB750 4into1 header
« Reply #11 on: May 22, 2025, 08:56:18 AM »
Quote from: Stev-o on May 22, 2025, 08:51:34 AM
Quote from: newday777 on May 22, 2025, 06:42:28 AM
Quote from: seanbarney41 on May 22, 2025, 06:33:33 AM
Quite sure I know what it is, but you say no guessing, so I will keep it to myself.
You funny guy

I think I know too...but dont want to guess!!!
Yuk Yuk
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline newday777

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Re: Help identify this CB750 4into1 header
« Reply #12 on: May 22, 2025, 09:21:53 AM »
I dug out my Kerker header to compare the 2.
Definitely different. Kerker is on the right with the bolt flanges.
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline BenelliSEI

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Re: Help identify this CB750 4into1 header
« Reply #13 on: May 22, 2025, 01:56:38 PM »
Regardless of the manufacturer, that is a fine looking pipe!
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Offline newday777

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Re: Help identify this CB750 4into1 header
« Reply #14 on: May 22, 2025, 02:21:11 PM »
Quote from: BenelliSEI on May 22, 2025, 01:56:38 PM
Regardless of the manufacturer, that is a fine looking pipe!
Yes indeed
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline willbird

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Re: Help identify this CB750 4into1 header
« Reply #15 on: May 22, 2025, 02:31:58 PM »
Quote from: BenelliSEI on May 22, 2025, 01:56:38 PM
Regardless of the manufacturer, that is a fine looking pipe!

I guess I agree with you LOL.

Bill
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Online HondaMan

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Re: Help identify this CB750 4into1 header
« Reply #16 on: May 22, 2025, 03:00:42 PM »
Stu: what is the ID of the pipes at the headers?
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Offline newday777

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Re: Help identify this CB750 4into1 header
« Reply #17 on: May 22, 2025, 03:36:04 PM »
Mark
38.05 mm OD
They have 1.25" long inserts to strengthen the head pipes at the clamping area, ID is 33.7mm, which means they won't go on the pre 77Ks(with the exhaust spigots), so, they must be used on 77/78K or F0-F3 or remove the spigot and use F clamp system.
The outlet diameter is 64mm
« Last Edit: May 22, 2025, 03:46:10 PM by newday777 »
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline low-side

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Re: Help identify this CB750 4into1 header
« Reply #18 on: May 22, 2025, 05:01:30 PM »
I'm not guessing either, but I did have an old Kerker that used the collets and collars.
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Offline newday777

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Re: Help identify this CB750 4into1 header
« Reply #19 on: May 22, 2025, 05:02:34 PM »
Quote from: low-side on May 22, 2025, 05:01:30 PM
I'm not guessing either, but I did have an old Kerker that used the collets and collars.
Interesting
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline BenelliSEI

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Re: Help identify this CB750 4into1 header
« Reply #20 on: May 23, 2025, 05:52:09 AM »
Are the collector and tailpipe all one piece? I don’t see and weld seams.if so, that is pretty unique too.
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Offline newday777

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Re: Help identify this CB750 4into1 header
« Reply #21 on: May 23, 2025, 06:03:22 AM »
Yes John, it is welded into one piece, just like the Kerker is.
« Last Edit: May 23, 2025, 06:06:56 AM by newday777 »
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline newday777

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Re: Help identify this CB750 4into1 header
« Reply #22 on: May 23, 2025, 06:14:18 AM »
It has some nice welds to make it one piece
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A
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