Not a performance issue. There is one solid piece to the stock 1600
manifold that surrounds both inner exhaust ports so there is no use for
the center material. If you have a stock gasket with a header, there
will be a pocket between the cylinders that has no material and no
exhaust either. Depending on the header flange you could have an
exhaust leak there.
Quoting datsunmike <datsunmike@nyc.rr.com>:
> Well what's the downside of using the stock gasket w/no seperation?
>
> Performance issue?
>
> I've been using the stock gaskets for more years than I care to
> remember
> w/no problems.
>
> I also don't see the problem of using a metal reinforced gasket w/a
> header
> unless the manifold flanges aren't made/machined well and I've seen
> that
> many times. The original good ol asbestos 1600 gaskets used metal and
> I
> never had a problem. Cough, cough!!
>
> Mike
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