Stock-type water pump concern...
Cooling system is set up as follows. Front radiator is aluminum 2 core. Rear one is stock 4 core. The coolant is routed out of the engine, to the top of the rear radiator. Then from the bottom of the rear radiator to the top of the front one. Finally from the bottom of the front radiator to the bottom of the block. This whole system filled takes about 7 gallons of coolant.
When we are on the track, with other trucks, the system gets a little warm, maybe climbing up towards 240. On our test track at home (where we don't push it so hard and prolly don't get the RPMs up quite as high), we have no issues with cooling. Stays right in the 180 - 195 range.
The rear radiator sits quite a bit higher than the rest of the cooling system. I'm curious about the design of a stock water pump. At high RPM, can it have trouble moving water that high? Is it starting to cavitate at those high speeds and not pump water? Anyone have any ideas on this???