In a message dated 10/5/00 7:09:29 PM Pacific Daylight Time,
arbosch@RA.ROCKWELL.COM writes:

<<... shop in California that uses a plastic-based
 abrasive elastomer to smooth out the rough spots in some heads.  What they
 do is force this elastomer thru the heads, under some ridiculous pressure,
 a few times, until everything is cleaned up nice and shinny.  >>

Alan,

I believe you are talking about the process (or company) called
"extrude-hone." It's supposed improve just about any intake. I've read
articles on the process used not just on VWs but domestic vehicles, other
European vehicles and Asian makes as well.

BenT
San Francisco