Sign in to follow this  
68RIVGS

Exhaust Manifold R and R.

Recommended Posts

Posted (edited)

Finally getting ready to change the cracked passenger exhaust manifold on my '68 Riviera 430.

It's only been that way for a few years now, and I figure I've procrastinated long enough.

Got a good used replacement manifold, Remflex gasket set, and new, shiny  SST manifold bolts.

Got a good mechanic with torches, and the use of a bud's warm, spacious heated garage.

Say a few prayers for me and my car !

Fingers crossed.

. . . will keep y'all posted

Manifold 1.jpg

Manifold 2.jpg

Manifold 3.jpg

Edited by 68RIVGS
. . . to add photos (see edit history)
  • Like 1

Share this post


Link to post
Share on other sites

DON'T use stainless bolts for ANYTHING on the exhaust!!!!

  • Like 1

Share this post


Link to post
Share on other sites

. . . any particular reason(s) why not SST bolts Tom ?

Please share with the group !

Share this post


Link to post
Share on other sites
Posted (edited)

. . . update:

Got the old crusty, crscked passenger side exhaust manifold off !

Did it the easy way -  simply torched the heads off the bolts, since the manifold was no good anyway.

Now each one of the exhaust bolt studs will need to be removed from the head.

A slow and time consuming process, don't want to break any !

Run a tap through each location, and the replacement manifold is good to go.

Edited by 68RIVGS (see edit history)
  • Like 2

Share this post


Link to post
Share on other sites

Don't install the new manifold until you put a straight edge across the runners and check for warpage. If it is warped, a machine shop can true it up.

Share this post


Link to post
Share on other sites

Randy,

 

   I replied to your PM which you can share with the group. DON'T use gaskets on the exhaust as Buick originally designed them for metal-metal contact.  The manifold probably cracked because of an exhaust leak causing the manifold to become overheated even though you may not have heard any loud exhaust noise.        For the BEST results have the manifold "Refaced" at a machine shop for the best no leak results.

  • Like 1

Share this post


Link to post
Share on other sites

Without gaskets, the manifolds also act as a heat sink and pull heat from the head. 

Share this post


Link to post
Share on other sites

Well the entire exercise has turned into a project, as the stubborn manifold bolts would not budge -

I managed to get 1 out of 6 out of the head - not bad for a beginner eh ?

Even after careful heating with an oxy/acetylene torch the bolts simply would not turn.

Heck, they have only been in there since 1967.

After breaking two of the through bolts, with no choice, we decided to remove the head on the right side of the engine to drill out the remaining bolts.

As expected, this has turned into a major job, but it's much too late to turn back now ! 

Onward and upward is the only way to go !

Man over machine, sez I !

Also on the + side, a good time to detail that intake manifold.

Edited by 68RIVGS (see edit history)
  • Like 1

Share this post


Link to post
Share on other sites

Always look for the silver lining.  Lots of times, it's the only thing that gets you through.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this