Quote Originally Posted by chevy 37
Any advice for an old man who has a buddy that has overheating problems with his 52 ford flattie. It has new water pumps from speedway motor and the engiine is stock except for a .030 overbore and a dual intake with 2 94's. The shroud and mechanical fan are stock and the radiator has been flushed. The truck is ok when moving with the temperature around 190-195 degrees but let it idle for a minute and it will boil over. Just running 10 percent antifreeze along with water. We took the engine apart but block looks good with nothing to impare the water flow.
overheating is when the coolant is boiling. preassure and antiffreeze content have a lot to do with the boiling point. the figure for preassure is 3* per PSI of preassure in the collant system, so say it is a 7# cap, water boils at 212*F so 21* so 233* is the new boiling point, not even figuring the antifreeze content in but if he's got a 4# or even preassureless cap, theres the problem. go 50/50 mix and get a 7# cap, a 50/50 mix of antifreeze raises the boiling point to 235* so add 21* to that and your boiling point is now 256*