a buddy of mines has a 89 camaro with a rebuilt sbc motor out if a 94 chevy truck. i dont know the specs on the motor but he can not run it with a thermostat because it will not open and he has tried 6 or 7. without a t-stat in it it still runs really worm the motor has the original serpentine belt setup. the antifreeze seems to flow out the fines in the radiator the right direction but if he installs a t-stat. we thought i they may have used the wrong water pump because it do use a reverse flow water pump but with the rad cap off it looks to be flowing in the right direction out the fines. he as a summit or griffin 2 row rad with a derale dual fan set up. the other day when the temp hit 104 down hear in georgia he couldnt drive it engine temp got up to 245 with both fans on at highway speed.