ZZ 502 Running Hot?, then stalls - help!
Hi All,
Just got a 1940 ford w/zz502 crate motor, single 4 barrel holley, phoenix automatic, walker zac-497 cobra z-series radiator with a "cooling components" shroud fan putting out 2700 cfm. I've had it to 50/60 mph on local roads and the temp continues to rise to over 200. I'm told that the zz502 should run at about 200' and after reading some that seems to be right. The car was built over the past 5 years and had 78 miles on it when I got it,, so it's new but never really driven. I just put in a 160' thermostat after talking to walker radiator (replacing the 180 that came with the car). Here's the symptoms:
1- starts great and idles at about 850-900 rpm.
2- after driving for approx 3-5 min the temp starts to rise and will hold for a short time at 195
3- as soon as it reaches 200 or more the motor runs rough and will stall.
It's not been on the freeway yet because of the cooling problem so I don't know how it will behave at freeway speeds but (in the short time I've owned it I've never seen the temp go down after it heats up). The "Cooling components" guy said to idle it and see what happens,, did that and the same thing happened after approx 20 min at idle but this time I was in the driveway and when it stalled I could swear I heard the gass boiling in the carb. The carb has no spacer intsalled which makes me think I have a gass boiling problem and not a cooling problem. Both walker & cooling components say their products are sufficient enough to keep the motor cool. Also the bottom radiator hose does NOT have a spring in it and the cc guy said the water pump could be crushing the hose causing water flow problems and that hose should be replaced (which does make sense to me). He also said it could be the altinator not putting out enough amps to run the fan properly,, (the car has a russ francis wiring system).
I'm happy to give you guys more info if you want,, just let me know.
Thanks for your help,
Jack