Hey Joshua,

You are experiencing a common problem associated with S-10 V8 conversions. Some of the reasons are: small engine compartment, radiator too small (stock usually not efficient enough), too much anitfreeze, faulty pump, ect.

A radiator from a 1986-1988 Corvette( I think this is correct) is highly recommended for its high flow rate and heat exchanging ability. Or an aluminum 4 core radiator should work as well. If you are running headers, that contributes alot to the heat as well as how much power you are making. Some folks remove the inner fenders to provide assisted air flow, but this can get kind of messy if you are a daily driver (rain, snow, ect.). I tried it and it didnt seem to improve things much. You also need to make sure the engine is tuned correctly. With the fans mounted on the front of the radiator I would think that alone would restrict airflow to it. Try to mount the large one on the back so it will pull ( if it is reversable) and see how that works. I dont think you are going to have much luck with the stock rad. But it you are not making that much power or running headers you might luck out and get by.

BTW, 210 doesnt scare me that much. But you have to run enough pressure on the system to keep coolant from boiling. A 50\50 ratio of antifreeze should be plenty if not too much. I go about 40\60 and have no problems.