Overheating issue

[Curtm220]

Originally Posted by special-K

Wholly thermostat Batman! I wonder why the L6s that never had the drilled thermostat never had this issue all those years

That's a good question. I had an inline 6 and never had an issue until I had to replace the radiator. After that the temp gauge would nearly peg before resting at its normal temp. After a new thermostat and still seeing e problem, Air under the thermostats was the only thing that made sense. Drilled the base and never saw it again.