Thread: ZZ 502 Running Hot?, then stalls - help!

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The motor is probably vapor locking. Gas boiling. Under hood temps to high. Crappy gas. Does it have a electric fuel pump? Removeable hood sides. Insulate the fuel lines. Move them away from the exhaust. Make heat sheilds. Ceramic coated headers. Header wrap. Spacer under the carb. Just how hot is the motor getting? Does the shroud have baffels that open at speed to let the air thru the radiator? What temp does the fan come on?

as fitzwilly said, the water pump rotation is suspect. I would assemble the following information:
1. What is the water pump direction (was it intended for a belt system or a serpentine system?)
2. What direction is it turning now?
3. What kind of fan shroud seal do you have? Is there gaps between the shroud and the radiator? Does the shroud cover the entire radiator? Is the fan on the back side of the radiator?
4. Have the pulley ratios been changed?
5. Put a piece of paper in front of the radiator with the engine idling. Does the paper suck to the radiator or blow off? (this tells you if the fan is turning the correct direction)
6. Have you changed the thermostat? Is it oriented correctly? Have you tried it without a thermostat?
7. Did you observe the lower radiator hose when the engine is getting hot? Did the hose collapse?

mike in tucson

Which intake manifold is on the engine?
Did you install it or did it come installed?
Suspicious symptoms of an intake getting over heated.