Originally Posted by
Taz
Not planning on yourself or any of your descendants needing to breath oxygen, or requiring an ozone layer for UV protection ? A conscientious person would not operate an "on road" vehicle without people friendly emissions equipment in place, and operational.
This topic has been discussed time and again - no real benefit to running a lower temperature thermostat in a non-competition vehicle. Also, your 8.1 L is already prone to piston rock / slap - GM redesigned these engines during their production in an attempt to address this issue. Running at a lower ECT (engine coolant temperature) has the effect of increasing the normal operating clearance between components - as these have not fully expanded - as they were designed to operate at a higher ECT.
With an 8.1 L I would recommend running the stock thermostat temperature range, with other Gen III / Gen IV engines you could run a 180 degree stat on a daily driven vehicle - but this change would also increase both engine wear and emissions output.
Regards,
Taz