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Old 10-27-2015, 12:19 PM   #1
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1997 31' Land Yacht
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Manifold 454 engine

Has anyone had trouble with cracked manifolds? We had a cracked manifold, replaced it, but it cracked again within a year and replaced it again, fortunately the second time was under warranty.
We are now in Niagara Falls, ON and went to a garage with another problem, and were told that there are special manifolds for RVs with this engine; however they have no idea where to get one.
Does anyone know of a source for this in case it happens again?
Thanks.
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Old 10-27-2015, 01:54 PM   #2
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hmm, some ideas here - http://www.airforums.com/forums/f159...eng-35888.html
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Old 10-27-2015, 02:24 PM   #3
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On my old Airstream 310 with a 454 (1983) I had mine replaced with Thorley (spelling?) RV headers. You might try googling that name. I believe they are still in business.
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Old 10-27-2015, 02:24 PM   #4
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Manifold 454 engine

454 manifolds cracking are common, especially on pre 1978 engines.

It is said that a contributing factor is exhaust systems that are too rigid.

I think this assessment is at least partially true.

Brevi tempore!
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Old 10-27-2015, 03:15 PM   #5
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No doubt the only real solution is headers.

If sticking with manifolds (I have) then you should cut through the webbing of the manifold between each port. You are still going to run quite a risk of your studs popping, but that's less of an expense than the manifolds cracking...... usually. I have read somewhere that using bolts rather than studs and nuts to secure the manifold eliminates problems, but I cannot vouch for that.

I believe that the "special manifolds" your mechanic is talking about would be headers. Google RV 454 headers, or wait for a few tips here. I really don't think a person needs to buy the most expensive big name ones though.

Here's a Frinstance, since you say you have a 1997:

http://www.summitracing.com/parts/he...ss-a-motorhome

Summit Racing have everything from these up to a thousand bucks or so for big name ones.

Note: if you get headers, make sure you get full length ones that will mate with your existing exhaust system without major modification. Avoid "shorty" headers.
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Old 10-27-2015, 03:58 PM   #6
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The only suck about headers is that some headers have an affinity to cause the header bolts to back out, and/or for the gaskets to blow out....

Copper gaskets help a lot and are worth the few extra bucks.

Fwiw, regarding shortys and long tubes, I always preferred mid length headers. Long tubes often want to drag, probably not an issue in an RV though.

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Old 10-28-2015, 03:29 PM   #7
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Thank you! The second time the garage installed a copper gasket, and we have a spare since they come in pairs. Never thought of doubling them up. I will look up the headers I case this happens again.
Great to have so many helpful folks on the forum.
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