What's going on with my manifold heat shield?
 

The heat shield on my 71 c10- 350 was rusted, pitted and UGLY.

Painted it with extreme heat paint.... it burned right off.

Had it powder coated.. and this is what's happening now...

I don't hear any exhaust leakage from the pipe or manifold.

Anyone have any idea or suggestions of what's going on or how to keep it looking good?

Thanks in advance..

Re: What's going on with my manifold heat shield?
 

Is that heat getting to the valve cover too? I say you have a leak

Re: What's going on with my manifold heat shield?
 

there is discoloration on the valve cover ... you thinking a cracked manifold ?

If I have to take it out... what can be done to the manifold to prevent it from looking like it does now?

Re: What's going on with my manifold heat shield?
 

Eastwood manifold paint.

https://www.eastwood.com/paints/hi-t...st-paints.html

Re: What's going on with my manifold heat shield?
 

thanks ... time to tear it apart.. again

Re: What's going on with my manifold heat shield?
 

Take a close look at the manifold, I think you'll find heat cracks caused by a retarded timing situation... https://www.google.com/url?sa=i&url=...AAAAAdAAAAABAQ Also, that white haze is probably zinc out of the smoke from the paint being burnt off the heat shield...Heat shields were never meant to be shiny bling. I suppose you could have them ceramic coated professionally by these guys, Jet-Hot High Performance Coat, or blast them clean and spray on some VHT Flame Proof and bake them in the oven when wifey is at work...;) You didn't get that info from me! lol

Re: What's going on with my manifold heat shield?
 

thanks .. i will check the timing

Re: What's going on with my manifold heat shield?
 

They had a problem for years with the manifolds cracking. I had a 72 with a 350 and it had some type of air diverters in the location you have pictured.

Most people ripped them off there due to accessibility problems when changing the spark plugs. I know that is what I did on that particular truck. When I got my 70 it did not have them on there.

Maybe someone can post a pic of those things for reference. Seems like your going for an original look.

Re: What's going on with my manifold heat shield?
 

thanks