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> Polishing, particularly inside combustion chambers, keeps the heat internal > instead of flowing into the heads and the rest of the engine. The generated > heat is, instead, carried out with the exhaust. (Toby). That's interesting; the new Brazil TP1600 heads I put on the bus have a nobbly (un-machined from the casting) surface in the combustion chambers. This would presumably pass more heat to the heads rather than the exhaust gases, so the exhaust valves run cooler. Dave. UK VW Type 3&4 Club http://www.hallvw.clara.net/ ----- Original Message ----- From: Erkson, Toby <toby.erkson@intel.com> To: Type 3 L+pī> e3@vwtype3.org> Sent: 08 June 1999 18:54 Subject: RE: [T3] Polishing? ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org