[mclairmo]

Make sure water pump pulley is smaller than crank pulley. Underdrive pulleys may cause low coolant flow issues. Also, make sure that the electric fan has a shroud covering the entire radiator core area. The fan needs to pull air in through the entire core, not just the round area where the round fan sits. Also, make sure that fan pulls enough CFM to cool your engine. Make sure wiring is big enough to feed it. Electric fans draw a lot of amps and need larger gauge wires. Try a high flow T-Stat and Water Wetter from Kragen or Autozone. Also, be sure that the fan is not pulling in hot air from the engine compartment through the radiator. Hot engine air sometimes travels under or over the radiator when truck is stopped and can get sucked back in through the radiator. You want only cool outside air going through the radiator. This is why many a/c equipped muscle cars had hood to core support seals to keep hot engine air away from the front of the radiator.