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On 9 Jun 99, at 19:27, Dave Hall wrote: > 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. For every possible reason, you want to minimize the amount of heat that soaks out of the combustion gasses. For this reason it is a good idea to polish the tops of your pistons and the inside of the combustion chamber. For obvious reasons, this is seldom done in stock engines. Jim - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/