How hot do my exhaust manifolds get? - Chevelle Tech
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post #1 of 15 (permalink) Old Jan 30th, 11, 3:50 PM Thread Starter
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How hot do my exhaust manifolds get?

Goint to paint my exhaust manifolds and the primer I want to use says good to 400 degree. Is this good enought. Stock 66 396/360HP?

Thanks, probably not the right area; but thought you guys would know the answer right off.
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post #2 of 15 (permalink) Old Jan 30th, 11, 3:59 PM
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Re: How hot do my exhaust manifolds get?

Exhaust manifolds have been known to glow in the dark after a high speed run.......so I have been told. That would be upwards of 1000 degrees or more. A leaned out carb and timing off the mark can aggravate the situation as well. Paint even burns off the cross over in the intake manifold under normal use. You will need high heat header type paint for it to survive long.
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post #3 of 15 (permalink) Old Jan 30th, 11, 4:21 PM
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Re: How hot do my exhaust manifolds get?

Quote:
Originally Posted by james a larson View Post
the primer I want to use says good to 400 degree.
That would probably burn up the first time you start the car.

That paint would probably be good to paint rest of the motor though, just not for the exhaust.
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post #4 of 15 (permalink) Old Jan 30th, 11, 4:27 PM
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Re: How hot do my exhaust manifolds get?

You need to use a coating safe to a min of 1500 F

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post #5 of 15 (permalink) Old Jan 30th, 11, 4:36 PM
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Re: How hot do my exhaust manifolds get?

they can get to 1200-1300 degs-no primer, straight header paint, after rust rem-Eastwood makes some paint that lasts pretty good

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post #6 of 15 (permalink) Old Jan 30th, 11, 5:01 PM
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Re: How hot do my exhaust manifolds get?

Jim, I used the POR-15 manifold kit 5 years ago on my mostly stock 283 and they still look like new with probably 12K miles on them.http://http://www.por15.com/MANIFOLD...uctinfo/MRKBV/
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post #7 of 15 (permalink) Old Jan 30th, 11, 5:22 PM
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Re: How hot do my exhaust manifolds get?

x2 on the POR manifold Gray paint, good to 1400* and looks like cast iron gray. I finished the manifolds on my sedan in 2004 with POR and have driven it 45000 miles since, still look like I just did them. Don`t need any primer, just bead blast them, make sure they are dry and paint them. It brushes on.

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post #8 of 15 (permalink) Old Jan 30th, 11, 5:25 PM
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Re: How hot do my exhaust manifolds get?

Go here to see a small block 383 at idle..

"Heat" Pictures of headers

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post #9 of 15 (permalink) Old Jan 30th, 11, 7:06 PM Thread Starter
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Re: How hot do my exhaust manifolds get?

Thats, good information. Thanks. I used Eastwoods product about 4 yrs ago. Looked good for 2+ years, then a couple of rust spots started to show up. Still have some left along with their rust enscapular from a different job. But the rust enscapular is only good to 400. thats what I was asking about. Guess I will just give it a couple coats of the left over Eastwood product. Maybe the Por 15 now or in a couple of years.
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post #10 of 15 (permalink) Old Jan 31st, 11, 2:17 AM
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Re: How hot do my exhaust manifolds get?

Quote:
Originally Posted by will02 View Post
Jim, I used the POR-15 manifold kit 5 years ago on my mostly stock 283 and they still look like new with probably 12K miles on them.http://http://www.por15.com/MANIFOLD...uctinfo/MRKBV/
Quote:
Originally Posted by elcamino66 View Post
x2 on the POR manifold Gray paint, good to 1400* and looks like cast iron gray. I finished the manifolds on my sedan in 2004 with POR and have driven it 45000 miles since, still look like I just did them. Don`t need any primer, just bead blast them, make sure they are dry and paint them. It brushes on.
They also make POR-20 which is an exaust and header paint. it also can be brushed on or sprayed on.

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post #11 of 15 (permalink) Old Jan 31st, 11, 9:39 AM Thread Starter
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Re: How hot do my exhaust manifolds get?

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Originally Posted by elcamino66 View Post
x2 on the POR manifold Gray paint, good to 1400* and looks like cast iron gray. I finished the manifolds on my sedan in 2004 with POR and have driven it 45000 miles since, still look like I just did them. Don`t need any primer, just bead blast them, make sure they are dry and paint them. It brushes on.
That manifold kit looks inviting. I had the manifolds sandblasted a couple of years ago and little rust spots are starting to show up. Don't really want to go through the blasting thing again. How do you think this would hold up applied on top of freshly cleaned eastwood product I applied a couple of years ago? Or do they have to be sandblasted again?
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post #12 of 15 (permalink) Old Jan 31st, 11, 11:05 AM
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Re: How hot do my exhaust manifolds get?

I am going to try the POR-15.Iwas told to bake them in an oven at 450* for 4 hours. Is this really necessary? Also,how much is required to do 2 manifolds,8oz?
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post #13 of 15 (permalink) Old Jan 31st, 11, 3:49 PM
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Re: How hot do my exhaust manifolds get?

Quote:
Originally Posted by james a larson View Post
That manifold kit looks inviting. I had the manifolds sandblasted a couple of years ago and little rust spots are starting to show up. Don't really want to go through the blasting thing again.
Well then you definitely want the POR stuff. that's what it's made for ("POR"... Paint Over Rust )

Quote:
Originally Posted by grandsport View Post
I am going to try the POR-15.Iwas told to bake them in an oven at 450* for 4 hours. Is this really necessary?
I don't think that it is, since it said nothing on the can about that when I used the POR-20 stuff. As far as your question about how much you need, you should send them an e-mail question about that. I'm sure that there must be a "contact us" link on their website somewhere.

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post #14 of 15 (permalink) Old Jan 31st, 11, 4:08 PM
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Re: How hot do my exhaust manifolds get?

Quote:
Originally Posted by grandsport View Post
I am going to try the POR-15.Iwas told to bake them in an oven at 450* for 4 hours. Is this really necessary? Also,how much is required to do 2 manifolds,8oz?

I think I'd buy 2- 8oz. cans. My headers took more than I thought.

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post #15 of 15 (permalink) Old Feb 2nd, 11, 8:18 PM
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Re: How hot do my exhaust manifolds get?

I did not bake them. I just let them dry for a couple days, installed them and fired it up. I guess that baked them pretty good. The small can of manifold paint did my stock manifolds and enough left for another set or more. The por would probably go on over the Eastwood since everything is clean.

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