It would be pretty tough to avoid exhaust leaks with no gasket of any
sort. Ideally, part of the machine work done on a head rebuild includes
refacing the exhaust ports so they're all level with respect to each
other, and then you do the same to the exhaust manifolds. A reasonable
substitute is to at least check the flange for straightness, and to use
a (straight) file to ensure any glaze and rust is removed from the port
flange. Exhaust manifold gaskets are usually an asbestos (or suitable
non-carcinogenic substitute) material around a perforated metal core,
with stainless reinforcing rings around the port holes. At least, that's
what good gasket makers such as Fel-pro do. I've also seen some pretty
cheesy ones from the discount gasket makers.
The worst headers I've seen had up to 1/8" warp from one exhaust port to
the next... About the only thing you can do with those is to bolt them
up to a spare head (without a gasket) and then heat the tubing bends
cherry red to re-set them in the right place. If you don't do that then
a gasket might seal them for the first few miles, but you'll have leaks
soon after.
Cheers,
Theo
> -----Original Message-----
> From: tigers-bounces@autox.team.net
> [mailto:tigers-bounces@autox.team.net] On Behalf Of CoolVT@aol.com
> Sent: March 27, 2009 9:54 AM
> To: tigers@autox.team.net
> Subject: [Tigers] Gasket
>
> I realize that with exhaust headers that an exhaust gasket
> is used. How
> about for stock, cast exhaust manifolds? The Tiger parts
> list doesn't seem to
> show one and my stock engine had no gaskets on the manifolds.
> Mark L
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