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But it has something to do with heat treat. Copper isolates the steel from the carbon during the heat treat. I understand the small and large ends are heat treated, then machined, (obviously) whereas the beam is not.
I would believe this over everybody saying the copper is to build up rods that...
Here's am explanation from Slantsixdan explaining the system, how it works and the history.
" PCV became mandatory in California for '61, in New York for '62, and was standard equipment in all states + Canada for '63.
The purpose of the crankcase ventilation system (of whatever type) is to...