Curt
You need a larger
oil cooler..... if you are going to try to go faster or compete..
250*degrees to 260*degrees is on the verge of over heating and will start to coke up.....
If you were really racing and came up behind another competitor .... your motor would over heat in a matter of half of a lap.....
Ideal temps to make horsepower is 200 water and 220
oil.....
Morris