I try to give the head a few minuets to warm up especially when it's real cold. The early 262's also had too much oil pressure at start up and could damage bearings. There were some engines that had an extra relief valve added into the oil supply line from the pump to help this. regardless I try to limit my revs when cold to allow the oil to get some heat too.
At shut down I let it idle near 1000rpm's for 30 to 60 seconds before shut down. More if the water temp is over the low end of normal range. Idling too low ruduces the air flow over the radiator and the flow of the water pump to near no productive movement. To avoid leaving a hot spot in the head this is crucial.
This is all relative to conditions and temps.
Nothing like hearing it run under load. These 262 6 cyl's really sound good. I know I love mine.
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