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Installing Rockwell Aluminum Manifold [message #148299] Mon, 31 October 2011 16:27 Go to previous message
Jp Benson is currently offline  Jp Benson   United States
Messages: 649
Registered: October 2011
Location: Fla
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I recently purchased a Rockwell aluminum manifold from the Applied folks for my GMC motorhome. After test fitting the manifold I found there were rather large tapered gaps at the front and rear of the manifold where it mates to the block. Pics are posted at: http://www.gmcmhphotos.com/photos/showphoto.php?photo=41388&title=front-seal-clearance&cat=5943. The front view shows a tapered gap that grows to over 0.200" on one side. The manifold is snugged into position with 4 bolts and there are no side gaskets which means the final gap will be even larger. To complicate matters, the mating surfaces are offset by almost 3/16" in the front. If I push the manifold as far forward as the bolts will allow, the mis-match is still 1/8". I don't feel very confident (using any kind of gasket/seal) spanning a 0.200" gap with a such a narrow bonding surface. Rockwell posted a fit test showing a uniform gap of .070". http://www.gmcmhphotos.com/photos/showphoto.php?photo=22826&title=spacing-manifold-fit&cat=3738.
Has anyone else seen this problem and how did they deal with it?

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