[Kurt in NJ]

I have tried to duplicate #4 being hotter than the other cylinders--- let it idle for a hour, drove over 55 for hour, then let it idle again -- #2 got 2 degrees warmer than4-- some of the temps swapped readings, all within less than 5 degrees
I did do a real good cleaning of the block including reaming the rust out of the little hole at the back of the block and head---35 years ago, always antifreeze, most times the gav is near closed, full advance for timing--- I took readings along the sides of the block at waterjacket, below water jacket along length of head, inlet, outlet
Perhaps it is because I have old style in hose thermostat
I also checked shock temperature-- hit every bump I could find, they only gained 5 degrees