I have a 77 Riviera with a 403 that has a cracked exhaust manifold, does anyone know if there is an aftermarket replacement available? Thanks

 

I don't know of aftermarket availability, maybe search ebay for 403 exhaust manifolds or oldsmobile exhaust manifolds.

 

x2

Aftermarket exhaust manifolds aren't available. A good welding shop should be able to repair the crack for you.

 

The correct manifold is casting number 554581. Search for that number on ebay.

 

contact me at wpgjetfan@hotmail.com

 

That post is nearly four years old. Hopefully the OP found one already.

 

@oldcutlass I am not sure how to report this, but is it possible that someone hijacked wpgjetfan account since he was not active in last few years till today?
.


?

 

While it is possible, it doesn't look like anything is out of order. He may very well have this part, however as always buyer beware and take the proper precautions. We all have accidently clicked on old forums by mistake, will monitor.

 

Its me,
googled that part number and although a 403 Olds part the 403 was used in several corporate applications.
I hope I can help the guy
parts horde acquired and I don't have a Rivera

 

If I don't hear back it will be an EBay item
Brian

 

Oldsjunction also did not list the part in their olds manifolds... so this is another reason this link was worth checking on. Old info is still good info!
Brian

 

Manifold up on EBay if you want more secure purchase
Brian
oldscutsup