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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old June 2nd, 2016, 04:34 AM
HOTRODJOHN HOTRODJOHN is offline
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Default Exhaust or headers

Has anyone built or bought headers. I am thinking on having flanges laser cut and building a set. What do you think. Thanks, John
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  #2  
Old June 2nd, 2016, 04:39 PM
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Default Re: Exhaust or headers

There was an album showing pictures of custom headers, but now I can't find it. lol I'll keep looking.
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Old June 2nd, 2016, 05:17 PM
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Default Re: Exhaust or headers

thunder v-12 makes header flanges for these engines. magnum & standard. can be purchased at thunder v12 .com
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Old June 4th, 2016, 04:56 AM
Olboatanchors Olboatanchors is offline
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Default Re: Exhaust or headers

I'm gonna follow this one. I've been thinking about building a set. Have you checked out http://www.headersbyed.com/hc_buildbetter.htm ? They don't sell flanges for the GMC 6's but there's some good info there.

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Old June 5th, 2016, 07:28 AM
HOTRODJOHN HOTRODJOHN is offline
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Default Re: Exhaust or headers

Have not tried either one but will follow up on Monday and report back. Thanks, for the info
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Old June 8th, 2016, 05:41 AM
HOTRODJOHN HOTRODJOHN is offline
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Default Re: Exhaust or headers

Bought the flanges today, he makes 2 sets one 1/4" and 3/8" thick. The 3/8" thick were more than twice as much but gonna give it a shot. The openings are 1 3/4" OD so that will be good, I will start to make them in aBOUT 3 WEEKS and will keep you posted. John
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Old June 8th, 2016, 03:21 PM
bobdylan bobdylan is online now
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Default Re: Exhaust or headers

Did you get them at thunder v12?
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  #8  
Old June 8th, 2016, 04:00 PM
Chuck78 Chuck78 is offline
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Default Re: Exhaust or headers

Sounds great, post pictures of your progress! I'd love to have a set of headers but don't have tubing bending equipment or experience...
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Old June 9th, 2016, 01:33 AM
HOTRODJOHN HOTRODJOHN is offline
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Default Re: Exhaust or headers

I got them from Thunder V12. The 3/8" flanges were stainless so I went with that. Hopefully no mistakes , could get expensive. Will keep you posted on progress. Thanks for the info on where to get the flanges. Very nice to work with, very informative.
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  #10  
Old June 27th, 2016, 07:37 AM
HOTRODJOHN HOTRODJOHN is offline
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Default Re: Exhaust or headers

Received the flanges they are vey nice. The exhaust ports are rectangle 1 3/4 x 1 /1/2. I am having the short pipe from the flange made now, when I get them I will start to post photos as I go. I am probably about a month away from starting due to the jobs I am doing now, 2 installations of A/C in other trucks. John
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