Wtf, broken exhaust manifolds

[M92PV4U]

This truck has been through 4 driver side and now two passenger side manifolds.
It's a '93 3500 5.7 tbi.
What causes this?

 

[ThePanzerFuhrer]

This truck has been through 4 driver side and now two passenger side manifolds.
It's a '93 3500 5.7 tbi.
What causes this?

It’s a 93. Should have went to the scrap yard 10 years ago

At least how it works up here

 

[M92PV4U]

It’s a 93. Should have went to the scrap yard 10 years ago

At least how it works up here

Aww come awn man, this is the new service truck, we've owned it less than 10 years.

 

[ThePanzerFuhrer]

Aww come awn man, this is the new service truck, we've owned it less than 10 years.

Are you even allowed to drive something that old in commiefornia?

 

[ThePanzerFuhrer]

This is me being jealous of a almost 30yo vehicle with factory heat shields still on the exhaust manifold . Fuck they even still look new

 

[ridenby]

Replacements have been dorman type stuff rather than GM?

 

[TRINDU]

All repop manifolds suck.

Buy cheap headers and remflex gaskets

 

[PAE]

Was antiseize used on the last break ?

Think of trying studs and brass nuts ?

I know its a spendy proposition but try ARP studs thru Summit racing, online thats the best stud or bolt you could buy and the best way to buy them.

Had a set of manifolds I gave away might still have the bolts, ill look.

 

[M92PV4U]

Replacements have been dorman type stuff rather than GM?

Dorman, couldn't locate factory manifolds, I guess that I should try harder?

 

[M92PV4U]

This is me being jealous of a almost 30yo vehicle with factory heat shields still on the exhaust manifold . Fuck they even still look new

Thats a couple month old dorman, that replaced the stock factory.

 

[M92PV4U]

Was antiseize used on the last break ?

Think of trying studs and brass nuts ?

Antiseize was used this last time, not the time before.

 

[M92PV4U]

It has new engine mounts, any suggestions on better quality manifolds? I really don't want to resort to headers.

 

[ridenby]

All repop manifolds suck.

Buy cheap headers and remflex gaskets

My train of thought.

 

[Thatg9659]

Obviously needs ls swap


Dorman manifolds are just junk. On triton Fords I would bust them off with a hammer.

 

[M92PV4U]

Fawk.

 

[Twankie]

I don’t think I have any on hand but the pnp has plenty of those manifolds if you need a set. I can get them decked before shipping if you want also.

 

[M92PV4U]

I don’t think I have any on hand but the pnp has plenty of those manifolds if you need a set. I can get them decked before shipping if you want also.

I'll keep you in mind, I'll check local yards first.
Decking would be great though, I've been using a long sanding board .

 

[ridenby]

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Maybe check parts counter here.

 

[Leadfoot21]

Do you have solid exhaust hangers ? Those trucks won’t tolerate much rigidity in the exhaust

 

[M92PV4U]

Do you have solid exhaust hangers ? Those trucks won’t tolerate much rigidity in the exhaust

No solid hangers and the y pipe has a flexible connector to try and stop the driver side from cracking.

 

[Snoop dogg]

I was gonna mention pick n pull. There are lower mileage Chevy trucks of that flavor still in the yards and a factory manifold would be ideal.

Also ebay might turn up something for you.

 

[TRINDU]

I really don't want to resort to headers.

What's the objections? smog nazis?

There has to be a cheap set of factory replacement shortys. Remflex will make up for the inconsistency/warpage.

 

[M92PV4U]

What's the objections? smog nazis?

There has to be a cheap set of factory replacement shortys. Remflex will make up for the inconsistency/warpage.

Yes, mostly smog nazis. Price really isn't a concern anymore, I've got at least $500 in manifolds + my hourly rate.

 

[woods]

I first reaction is how much room you have to work in there. holy crap

 

[TrailTamer]

This may be a silly idea, but… I’ll ask anyway.

What gasket did you used and did you gorilla torqued them on?

Too tight and excessively preventing the manifold from expand and contract?

Also, I’m failing to see what broke on manifold(s) in pics.

 

[M92PV4U]

This may be a silly idea, but… I’ll ask anyway.

What gasket did you used and did you gorilla torqued them on?

Too tight and excessively preventing the manifold from expand and contract?

Also, I’m failing to see what broke on manifold(s) in pics.

Torqued to specs. Driver side dorman gasket, cracked down by the collector.
Passenger side no gasket, cracked under the heat shield on the first outlet (cylinder #2).

 

[M92PV4U]

Maybe I should reduce torque by 30% since I'm lubricating the bolts...

 

[TrailTamer]

Maybe I should reduce torque by 30% since I'm lubricating the bolts...

I think they should’ve been find despite lubricated bolts.

Just get CA-approved shorty headers…?

 

[M92PV4U]

I think they should’ve been find despite lubricated bolts.

Just get CA-approved shorty headers…?

Possibly, the other hang up besides smog is... my dad's my boss and he's a stock purest, so I'll pick some out and we'll see.

 

[bradp674]

1993 Chevy C3500 Exhaust Manifolds | Speedway Motors