Re: head gasket, any mods while I am in there?

[Ken Keith <auditude@impulsedata.net>]

"Graydon D. Stuckey" <graydon@apollo.kettering.edu> wrote:
> 
> I figured I'd do only some minor "cleaning up" of the ports to smooth 
> the airflow ever so slightly, but I found out that the exh ports were 
> _much_ smaller than the gasket so I gasket matched the exh ports.
                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Is anyone else familiar with the term "inversion dam"?  I heard or read 
somewhere that the non-turbo motors have a smaller exhaust port area 
than the exhaust manifold port area, to prevent sucking air back into 
the head.

I am contemplating mods to a head for my 4ksq, and I want to get some 
feedback about this.

Thanks,

Ken
-- 
http://www.geocities.com/motorcity/garage/4153/