Re: intake manifold polishing

[Carson Scott <carsonscott@earthlink.net>]

Oh boy, finally a topic I can offer my two cents. 
 Polishing the intake manifold, does offer an advantage, over a
non-polished manifold. I'm not sure, if you would see any gains with a
stock engine. Once we port and polished the heads, the manifolds had
become a restriction. And you must match port the manifold with the head
(gasket included). We've also found out that, if the manifold gasket
projects just the slightest amount into the port, flow is reduced. Today
polishing the manifold thinking has changed. We port the manifolds, but
don't polish them, like we used to. The porting stone leaves a fine
pattern, that improves flow by creating a 
swirl pattern in the air. This also increases the air speed. Hopes this
helps you.
Carson

63 Pro-Stock Drag Notch
65 Sunroof Notch
63 European Sqbk. (for sale or trade)
66 Squareback (for sale)
65 Double door panel bus (for sale)