67 427 factory tube headers

[Dave W.]

we got a set off tubular side exit headers and large [ 3 or 3 1/2 inch] black side pipe mufflers with our car they have a G M ?? part number 3960710 and BH125A stamped in them are these GM dealer headers ?? was told hooker made these for gm, and gm just added their part number any info appreciated thanx dave

[Joe L.]

Re: 67 427 factory tube headers

we got a set off tubular side exit headers and large [ 3 or 3 1/2 inch] black side pipe mufflers with our car they have a G M ?? part number 3960710 and BH125A stamped in them are these GM dealer headers ?? was told hooker made these for gm, and gm just added their part number any info appreciated thanx dave

Dave------


GM #3960709 and GM #3960710 were once-available big block headers available in SERVICE. They were never installed on a PRODUCTION Corvette. These parts were released sometime during the 1969 model year; they were not even available during the 1967 model year.

What the manufacturing history of these parts was I do not know.

[Duke W.]

Re: 67 427 factory tube headers

I recall from the Chevrolet Power Manuals that the GM OTC big block racing exhaust system was made by Kustom Headers. Hooker also made a similar system with slip in mufflers for the side pipes... had a friend back then with this system on a '67, but I think it was only sold through the aftermarket, not GM.

Duke

[Daniel S.]

Re: 67 427 factory tube headers

The Z28 had Kustom (yes with a K) headers available OTC GM but were never installed on the assembly line. Same throughout 68-69. Not like this helps but I surmise Kustom was considered an OEM supplier similar to Winters, AC Delco, etc.

Dan

[Steven B.]

Re: 67 427 factory tube headers

A friend's roomate had these on his Vette made by Kustom. The Hookers were/are different I have a Kustom flyer somewhere with these advertised. Steve

[Duke W.]

Re: 67 427 factory tube headers

The Z28 had Kustom (yes with a K) headers available OTC GM but were never installed on the assembly line. Same throughout 68-69. Not like this helps but I surmise Kustom was considered an OEM supplier similar to Winters, AC Delco, etc.

Dan

Kustom also manufactured the 409 stainless try-wye header that was factory installed on all Cosworth Vegas.

Duke

[Dick W.]

Re: 67 427 factory tube headers

Easy way to identify the difference between Hooker and Kustom. The two supports on the side pipes are flat steel on Hookers, the Kustoms were a stamped steel channel. I had to go look, I still have a pair of NOS Kustom side pipes (no headers)

[Edward B.]

Re: 67 427 factory tube headers

Not specific to Corvettes, there's a lot of good information on the CAMARO RESEARCH GROUP site regarding factory headers.

Ed

[Dave W.]

Re: 67 427 factory tube headers

doyou want to sell mufflers ?? how much thanx dave