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I need chevy exhaust manifolds (Read 7,607 times)

Scot-W

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Posts: 34

I need chevy exhaust manifolds
Oct 26^th, 2011 at 4:16pm

71 K10 350 restoration project. After driving her for some 20K miles with no indication of an exhaust leak. She slept covered up, for 15 years. Come to find out after sand blasting the manifolds for paint, they are cracked, like see through cracks !!! Any way all new manifolds come with a.i.r. ports which I don`t want. I need a pair, ,,,

casting # 3989036, ram horn style, center dump, 2 inch outlet with donut style gasket , no accessory mounts or a.i.r. ports left and right the same.

I`ve spent 10 hours + looking with little to no luck. Have any ? Any leads ? TIA

Regards
Scott W.

Zi6_0952.JPG (702 KB | )

Zi6_0951.JPG (752 KB | )

Zi6_0949.JPG (1028 KB | )

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Randy H.

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Tools are only as good
as the Tech holding them

Posts: 1,692

Bardstown, Kentucky
Kentucky
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Re: I need chevy exhaust manifolds
Reply #1 - Oct 26^th, 2011 at 4:31pm

You can always Braze the old ones (a lost art anymore). Brazing is done using brass and an acetylene torch OR MAPP gas and oxygen. OR you can buy cast iron welding rods - but very few welders can do this anymore. You have to weld cast iron very carefully - most welders cant do it.

Have you tried the racing supply companies?
(JEGS, SUMMIT)
Or have you tried Rock Auto (my fave) or Northern Auto Parts?

Anyhow those cracks arent that bad - its not broken in two - so you could easily braze those cracks shut once you vee it out with a grinder Wink

Randy Hatton
Fleet Technician
Elevation: AVG 648 ft.

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Scot-W

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Re: I need chevy exhaust manifolds
Reply #2 - Oct 26^th, 2011 at 5:50pm

Whoa, messed up those pics, I`m not sure brazing would be the way to go for this application, good thought though. The manifolds will be coated by Jet-Hot. They heat em up to about 1400 degrees, sand blast em, coat em inside and out with a lifetime warranty. I would be afraid bronze would void the warrenty.

New oe and aftermarket manifolds come with a.i.r. ports drilled in them. Don`t want that.

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Randy H. Super Nerd Picogroup Offline Tools are only as good as the Tech holding them Posts: 1,692 Bardstown, Kentucky Kentucky USA Gender:	Re: I need chevy exhaust manifolds Reply #3 - Oct 26^th, 2011 at 6:57pm If they have air ports drilled in them, are they threaded? If so just find some pipe caps and fill the holes....
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drdiesel1 Super Nerd Picogroup Offline Posts: 1,243 Nevada USA Nevada USA Gender:	Re: I need chevy exhaust manifolds Reply #4 - Oct 26^th, 2011 at 7:04pm Aftermarket headers have come a long way in the last 15 years. I wouldn't bother with the old crap. Some newer stuff would work better, IMO
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daveyK Super Nerd Picogroup Offline (Retired) - Elevation: 525 feet Posts: 2,357 Hellertown, PA, USA Pennsylvania USA Gender:	Re: I need chevy exhaust manifolds Reply #5 - Oct 27^th, 2011 at 8:34pm Scot, give this place a try: http://www.bowtiebits.com/ If what you want is not on their website it may pay to call or email them. HTH dave
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