Hello

I am in the process of placing a GMC 5.3 V8 Vortex out of a 2002 Yukon into a 1971 Toyota FJ40 Landcruiser.

The FJ40 had an older Chevy 350 V8 with a custom horizontal flow aluminum radiator with a overflow tube at the radiator cap draining into an over flow tank. I would like to use this radiator with my new engine.

I believe the 1970 era 350 water pump delivered hot water to the lower right side radiator inlet and then cool water returned via the upper left radiator outlet. I also believe the newer 5.3 water flow is in the opposite direction with the hot water coming out left upper side and then returning from the right lower radiator to the motor. I am thinking, especially with the cross flow radiator, that it should not be an issue to merely hook the water hoses up and then have the water flow from the top left to bottom right of the radiator. Does anyone have any comments on this?

My other issue is the small hose coming off the top of the motor that I believe originally went to a pressurized coolant overflow tank. I believe the overflow tank then had a return to the radiator. My question is how to deal with this hose from the motor and hooking it up to a overflow tank. Do I need to place a pressurized overflow tank and then install a new vent tube in my radiator to communicate with the overflow tank? Where would be the best place to weld a tube to the radiator – upper or lower / left or right side? What do I do with the vent tube off the present radiator cap?

Does anyone have any recommendations on how to plumb a system that will work with my old radiator and new motor?

Thanks