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Open Roads Forum  >  Class A Motorhomes  >  Maintenance Issues & Tips

 > Any advice for replacing exhaust manifold gasket in a 454?

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Brian in Michigan

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Posted: 05/14/20 11:51am Link  |  Quote  |  Print  |  Notify Moderator

I changed mine over to headers about 10 years ago. Used my acetylene torches and got each bolt red hot then let it cool for a minute. Each bolt came right out. Are you sure its a blown gasket and not a cracked manifold?


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atikovi

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Posted: 05/14/20 12:12pm Link  |  Quote  |  Print  |  Notify Moderator

Brian in Michigan wrote:

Are you sure its a blown gasket and not a cracked manifold?


At this point does it matter? Either way it has to come off.

Krusty

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Posted: 05/14/20 12:57pm Link  |  Quote  |  Print  |  Notify Moderator

I would definitely be tempted to go over it with a stethoscope and figure exactly where the noise is coming from before I took it apart.


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Posted: 05/15/20 09:38am Link  |  Quote  |  Print  |  Notify Moderator

atikovi wrote:

Brian in Michigan wrote:

Are you sure its a blown gasket and not a cracked manifold?


At this point does it matter? Either way it has to come off.


Well, yes, it does matter. If the manifold is cracked, replacing the gasket won't fix your problem. [emoticon]


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atikovi

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Posted: 05/15/20 05:26pm Link  |  Quote  |  Print  |  Notify Moderator

Got it off today in less than an hour.

[image]

[image]

Didn't bother using any fluid as it's mounted with bolts and no way to reach the threads behind the manifold. Bolts came out without any issue. Which gasket should I use? This metal GM gasket for about $20?

[image]

Or these composite style aftermarket for half that for a pair?

[image]

okhmbldr

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Posted: 05/16/20 12:51pm Link  |  Quote  |  Print  |  Notify Moderator

Great job! I think the composite gaskets would work just fine.

atikovi

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Posted: 05/16/20 03:17pm Link  |  Quote  |  Print  |  Notify Moderator

Turns out those are the wrong gaskets. This manifold has round ports and those gaskets are oval. Looks like I need a Fel Pro 1412 or Mahle 95100SG. Any idea what heat riser gasket it would take? The distance between bolts is 3 9/32" and the hole diameter is 2 9/16" but I came up empty.

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Bird Freak

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Posted: 05/16/20 03:48pm Link  |  Quote  |  Print  |  Notify Moderator

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