pressure in radiator when vehicle has not been run
I have a 406 chevy small block with a 350 turbo trans in a 1986 elcamino SS. I drag race in the 1/4 mile runs 11.70. I am having a problem with my radiator building pressure and going back into the recovery jug. I have no water in my oil, no water in the cylinders. I have flushed the radiator and put only water back in it and it has not changed anything. I have changed the radiator cap and still no luck. I can leave it sit after letting the pressure out and it will build it right back even if it has not been ran. CONFUSED PLEASE HELP!!!!!