Ok I just boought another slant 6 project tuck 79 D 100. Exhaust manifold is cracked. Anybody have one? Or ideas? Also need speedo head. HELP!

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Do the thing you fear... And the death of fear is certain..

You need to decide if you want to simply replace the broken manifold with another factory manifold or that the opportunity to up-grade the exhaust system.
DD

I'd love to do the header thing but this is your basic rat rod truck used for haulin motorcycles. Although I have made the interior nice.
I have a 79 Magnum that gets all the good stuff lol. I really don't have a few hundred bucks to throw at headers although I know its the best way to go.

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Do the thing you fear... And the death of fear is certain..

Oops, no, you misunderstood Doc's post. Headers are not the best way to go. Click the photo he posted.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Didn't see photo. I just need something to quiet the thing up and not leak. I like the noise coming from the back of the truck. Not the front. lol.

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Do the thing you fear... And the death of fear is certain..

Click the link for a new manifold. This is in case you can't find one at your local wrecking yard. http://www.1aauto.com/1A/ExhaustManifol ... 09/1071591

i have one $25 plus shipping pm me with your address if interested

Sounds like a used factory manifold is the best for your situation.
Be careful, many of the used exhaust manifolds are also cracked and warped... you end-up putting time and $$ into a manifold that does not fit well or quickly breaks.

Be sure to read the exhaust manifold installation article posted in the article section of this web site and keep asking questions.
DD

Cheap fix (if you have access to an oxy-acetyl. set up) is braze it-if you know where the crack is drill a 1/16" hole at either end to stop it from getting worse. Then do some homework on cast iron brazing and have at it.

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<img src="http://farm4.static.flickr.com/3173/2992308402_5481afb26e_t.jpg">

Yeah! Do it! I just bought the front half, waiting on some money to buy the back 3 cylinders.

But if you want to weld up the cracked manifold, it will work. I did it on my 4 banger turbo years ago and it held for about a year. Then new cracks appeared. Not saying yours will, but cracks are a scourge of the inline community. Why not just fix it right to start with, and never have to fool with it ever again?

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If it was easy, everybody would be doing it.

I appreciate everyone's help and advice. I haven't wrenched on a motor in 3 years. I guess it's time to get dirty. I always did enjoy it. Who knows...with all your help maybe I'll end up with a dependable everyday ride that won't kill my wallet. I always understood the SL6 to be indestructable. Hope what I hear is right. lol. Again,, thanks to all.

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Do the thing you fear... And the death of fear is certain..

I'd be inclined to do the "stitch" repair method rather than try to weld or braze it

http://www.locknstitch.com/castironwelding.htm

unless you have the facilities and experience to weld iron castings...

Stitching works on larger castings where the crack is surrounded by a relatively large area of sound material which supports the repaired area. Usually stitching is used to repair freeze cracks in heads and blocks. Exhaust manifolds often break completely. Even if they don't break completely they are usually very brittle and weak and a poor candidate for welding. A good used or new manifold is likely cheapest and easiest.

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Joshua