You might get an air lock at the back of the block,
go get your tune/dyno you might just be getting too much fuel
As Alitis say you may want to run some radiator flush through the system,
and with all this hot weather your cooling system will need to be spot on.
Winnie got a great deal on a bigger radiator. You have "Goat Syndrome"
Do Nissan 4.2 have a block bleedscrew on the back of the block???
He's not around anymore [retired] but he enhanced any water pump by removing factory press steel fan/and replacing it
with a proper impellor, John Bennet is the GURU of all things to do with cooling a motor. I think the V8 supercars use his system.
He puts the thermostat in the bottom hose, He made two stages for cooling, I had his water pump in my SBC troopy, would never overheat.
Shame he retired and never passed on his knowledge
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