Make sure that the washers on the bolts holding both the manifolds on
are parallel to the head when you tighten them up. I had to replace a
manifold one time and found that the replacement manifold and the
original weren't exactly the same thickness, so the bolt tightened up
more on one manifold than the other. I had to put a shim under the
washer on the thinner one. I got some fender washers and cut them in
half so I could shim one side.
Might not be your problem but it's worth a look.
Cheers,
CR
Marc wrote:
> I was all prepared to solder shut my poppets to solve the high idle
problem,
> but figured I would check everything else before diving in. Car idles
fine,
> about 700 - 800 rpm when cold, but as it warms up, idle is around 1100 -
> 1500 rpm. I sprayed some carb cleaner around, and as it hit the union
of the
> intake manifold & block, it became apparent my leak is back.
>
> Now, when I first did my conversion from ZS to dual HIF's, I checked the
> head for flatness using a straight-edge, and had the manifold lightly
> belt-sanded. It's quite flat! Everything was assembled with new
gaskets, and
> torqued down, although I don't recall what the torque setting was,
must have
> gotten it out of the manual I believe.
>
> It appears to be pulling air at the front of the manifold between the
first
> and second studs. The front nut was tight, gonna have to pull the
carbs to
> check the center studs.
>
> My thoughts are to tighten more (how much is too much, don't want to
strip
> the threads out of the head), maybe use some gasket sealer, I could
replace
> the gasket again - I used the standard Moss supplied gasket, I think
someone
> mentioned there is a competition gasket that's thicker?
>
> The flanges on the exhaust & intake manifolds are about the same
size, but
> perhaps a small shim between the intake's flange and the washer may
improve
> the situation. I just don't want to wind up with some jack-legged
> configuration...
>
>
> --
> -----------------------------------------------------------
> Marc Siegel, Charm Net LLC eMail: smarc@abs.net
> Baltimore, MD http://www.abs.net voice: 410/361-8160
>
> *
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