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Message: <blockquote data-quote="shovel" data-source="post: 1590409" data-attributes="member: 29855">A bit more to report;  I stacked 6 gaskets with a thin smear of RTV between them and weighted them down between a couple boards to cure so it became effectively a single solid spacer 3/8" thick.   Installed that and was not at all happy with the sound.   Still all the dual plane chugging but with the added sound of somebody chopping carrots on a butcher block.  I guess that 3/8" gap at the top of the wall with sharp edges is enough to just create a lot of turbulence and not much else.. so, later on in the future maybe I'll take off the manifold and cut down the wall for now I'll just live with the chugging.  I took the stack back off. Some good news is I got a progressive linkage made for a carburetor and was able to bend it a little & work on the Sniper 2.   It's a shame Holley doesn't just provide a correctly sized progressive link in the box to begin with,  their throttle arms already accommodate it and the laptop software accommodates it.  Couldn't be that difficult to also throw in a little piece of bent wire and enable the tick box + % input field on the phone app.. [MEDIA=youtube]RvADgCviLJc[/MEDIA]</blockquote>