340 Running Temp

340mopar said
If a motor runs warm while idleing or slow speed (under 35mph) it is a fan/ shroud problem. If a motor runs warm at speeds above 35mpg and has a steady rise in temp then the radiator is too small. I would say that you need a bigger radiator being you cooling problem is more speed related. Granted if your motor was running on the lean side it would build heat easier but if it runs good and doesn't surge then that is not the issue.

Chuck

Chuck,

Its the stock radiator for a 340. The motor is not heavily modified, just basically stock 70 340 w/ X heads. It doesn't ping, so I wouldn't feel that the timing was too advanced. Also, the carb is not lean. The fan is tight and take s a little bit of a twist to spin is by hand. It stops turning immediately after the motor is shut off. BTW, it is the clutch type.

It does not have a shroud on it, and trying to find one for cheap is next to impossible it seems!! :angry4: The oil doesn't seem to show signs of overheating, or the plugs. The pressure when hot is 35-40 psi at idle, 60 psi at 1300 RPM, and 65-70 psi above that when warm.

Thanks for any addtional input.

-Justin