[72c20customcamper]

Originally Posted by dieselfuel007

i have a k10 with a mild built 454 thats having some cooling problems at idle the gauge runs straight up going down the road but if i let it idle it starts to run over on the hot side of the guage i've used a temp gun on the thermostat housing its around 200f when the gauge shows it hot but when shoot around the sending units its 210-215f . this is what i've done so far 7 blade fan gm heavy duty fan clutch repop big block fan shroud new 16 ibs stant rad cap added recovery tank timing is good carb runs alittle rich also it has a wieand aluminum short water pump short and the fan is half in the shroud it has a 4 core radiator that was in the truck when i bought it i really don't want electric fans either

The electric senders are notorious for being inaccurate. If you look at the factory gauge it's got a huge "normal" range my 72 350 the gauge stays just above the first tic . But my mechanical will be at 185-190. If your running at 200° water temps at idle its withing range . My 496 use to run those temps all the time with mechanical clutch fan . I switched to a DeWitt 2 row aluminum and spal fans . The fans come on at 195° water temp in the rad . The mechanical temp in the head is 215° to 220° when the fans kick in head temp will always be higher than the water in the rad . Your right above the cylinder where the most heat will be in a rather small water chamber .