470 exhaust manifold, looks okay?

[natemoore]

I pressure tested my manifold. There are no leaks. That's good.

You can see from these pictures that there is considerable erosion around the #4 cylinder mating surface, as compared to the #2, also shown.

The Quicksilver manifold is $900. An aftermarket company called GLM is going to start making these, and they'll retail at around $350, but they are at least a year away according to one of their distributors.

So, I think this manifold will work despite the thin gasket surface area, at least for a while. Hopefully, it will last until these GLMs are offered.

Can an adept aluminum welder add some metal to the eroded areas, or would this stress and crack manifold?

 

[bruceb58]

Re: 470 exhaust manifold, looks okay?

This is the mating surface between the manifold and the head right? There is no water passage here so not a big issue. As long as you don't have an exhaust gas leak there should be no danger of using these as is.

 

[natemoore]

Re: 470 exhaust manifold, looks okay?

This is the mating surface between the manifold and the head right? There is no water passage here so not a big issue. As long as you don't have an exhaust gas leak there should be no danger of using these as is.

Yes, manifold-cylinder head mating surface.

 

[nimrod69]

Re: 470 exhaust manifold, looks okay?

Stay away from GLM- very bad quality- Made in China, need I say more?

 

[bruceb58]

Re: 470 exhaust manifold, looks okay?

If you aren't getting an exhaust leak then you need not be worried. Its the riser manifold joint where you need to be worried about.

 

[natemoore]

Re: 470 exhaust manifold, looks okay?

Stay away from GLM- very bad quality- Made in China, need I say more?

Hey watch it! Every single one of my disposable power tools in my work trailer is made in China!

 

[natemoore]

Re: 470 exhaust manifold, looks okay?

If you aren't getting an exhaust leak then you need not be worried. Its the riser manifold joint where you need to be worried about.

There is a little erosion there, but it still looks okay to me. No one has answered the welding question, though.

Red RTV is from my pressure test, btw.

 

[Link2052]

Re: 470 exhaust manifold, looks okay?

Here is mine, 2003 4.3L port side exhaust riser spacer. after 6 years raw water cooled run in salt only and flushed with a flushing product for salt use.
When I split it apart I noticed the exhaust shutter was cracked I think this might have added in the breakdown of the cast at that surface.
took off other side and it was perfect .
Replaceing both riser spacers
Link