Author Topic: original headers  (Read 1616 times)

sam

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original headers
« on: January 18, 2011, 05:06:02 PM »
did any of the original GM headers for the  Z/28 come with 3 bolt flanges or did both manufactures supply 4 bolt flanges?  Thanks, Sam

x66 714

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Re: original headers
« Reply #1 on: January 18, 2011, 07:51:52 PM »
My factory headers have 3 on 3 flange although nobody will acknowledge their existance & at least 2 sets of these exist...Joe
See America's First, Chevrolet

1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968
1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969

Jon Mello

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Re: original headers
« Reply #2 on: January 18, 2011, 09:53:57 PM »
Show us some pictures of what you have.

-Jon
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x66 714

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Re: original headers
« Reply #3 on: January 18, 2011, 10:15:24 PM »
I don't know how to post pictures but I can send some to you if you would post them...Joe
See America's First, Chevrolet

1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968
1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969

tom

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Re: original headers
« Reply #4 on: January 18, 2011, 11:28:56 PM »
Use quick reply. Type in your message. Click on "Preview" button. Near the bottom of the screen (you may need to scroll down) click on the "Browse" button. Browse your PC and select the photo you want to post. Maximum size of the image is 150 KB, and you can attach up to 4 pics to a single message. You Can also link pictures from other web sites, but if the photo comes down on the other site it will no longer show up here.
Looking forward to seeing those photos...
69 X11 Z21 L14 glide
looking for a 69 export model (KPH) speed
o

x66 714

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Re: original headers
« Reply #5 on: January 19, 2011, 02:03:30 AM »
These are the header that are on my car. They say "GM 3" in 4 different locations per pair. They have an od shaped mounting flange & the alt bracket is welded on to support the original mounting bracket. They are 1-3/4 primaries with 3 bolt collectors...Joe
See America's First, Chevrolet

1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968
1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969

Jon Mello

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Re: original headers
« Reply #6 on: January 19, 2011, 04:26:00 AM »
What's the thickness on that upper header flange? It seems thicker than usual for a '60s era header. The flange itself is not shaped like either the Bill Thomas '67 header or the Kustom '68 header. I've seen Kustom use two different style upper header flanges back then, one with straight-cut ends and the other with pointed ends. Both had square notched areas for the boss in the side of the head, and only one notched area per flange rather than two like these have. I don't know what these are. Maybe Jerry does.

-Jon
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x66 714

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Re: original headers
« Reply #7 on: January 19, 2011, 04:34:12 PM »
.250 flange thickness...Joe
See America's First, Chevrolet

1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968
1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969