sandblast exhaust manifolds? - Pontiac GTO Forum
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post #1 of 14 (permalink) Old 01-22-2012, 09:37 AM Thread Starter
 
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sandblast exhaust manifolds?

I am still looking at new HO manifolds or headers, but if I do keep my original manifolds, I would need to clean them up.
I couldnt upload pics, but they have the usual amount of surface rust for a car that's 47 years old
Is sandblasting a good idea for these? I have "black beauty" that I've used for other body parts.
As always, any input is appreciated.
Paul
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post #2 of 14 (permalink) Old 01-22-2012, 10:06 AM
 
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I have a few spares sitting around that were nasty. Blast cabinet with sand had them cleaned up in about 5 minutes each, no issues.

Burning rubber since 1982!!
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post #3 of 14 (permalink) Old 01-22-2012, 10:43 AM
 
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Blasted mine, look like new...
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post #4 of 14 (permalink) Old 01-22-2012, 10:47 AM
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I blasted mine last March and painted them with flat black stove paint. They still look fine and have no rust....and I've driven the car quite a bit since then.
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post #5 of 14 (permalink) Old 01-22-2012, 12:48 PM
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Yeah, blast em with about anything and then coat em with some type of high heat paint or sealer.

I like Eastwoods stainless steel or cast iron paint.
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post #6 of 14 (permalink) Old 01-22-2012, 01:19 PM Thread Starter
 
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Looks like it's unanimous.
I'm heading to a sandblast cabinet tomorrow.
Thanks guys!
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post #7 of 14 (permalink) Old 01-22-2012, 10:07 PM
 
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I knocked off the heavy rust with a hand held wire brush (although I do have a blast cabinet) then painted them with POR-15 factory manifold grey. They look brand spanking new! I recommend getting a small can of the POR15 factory manifold grey.
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post #8 of 14 (permalink) Old 01-23-2012, 09:46 PM
 
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Thanks for all the posts in this thread. I'm still running my original exhaust manifolds, so this looks like the best option is to sandblast and high heat paint. Typically, once sandblasted and repainted, are the casting numbers still legible?
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post #9 of 14 (permalink) Old 01-23-2012, 10:01 PM
 
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Cant remember if mine were or not. But I doubt it.
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post #10 of 14 (permalink) Old 01-23-2012, 10:25 PM
 
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No issues with the PN, that is heavy metal and blasting just skims the surface. The ones I did look great, but were older restoration pieces, not original rust belt items.
Orbit, I love por 15, how long did the manifold paint last? May paint the bottom of the heads with the stuff if it works really good.

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