Re: XJ Goes Above 210 When First Started
That is not abnormal, many stats do that. Your stat opens after warming up and there is probably some coolant that is warmer from the rear of the engine that has been stagnant that needs to pass. If you want to smooth it out a little, drill a very small hole in the top of the stat. It will bleed air better and pass a little coolant, but not enough to affect anything. The only time I wouldn't do that is in areas with prolonged extremely cold winters. I do it on my engines
230 hp 4.3L Chevy
Built 4L60E with manual lockout
Atlas 4 speed
Griffin radiator
On board air
Warn 9.5ti on custom bumper
7.5" RE front and bastard pack rear on custom long arms
30 gal gas tank
lockers
And a bunch of other stuff
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