Is there anyway to add this to an L98? I don't mean to add the Lt1 heads or intake just to reverse the flow of coolant on our engines, what would it take to do this?

 

Good question. I'm not going to hypothesize but I can't see it being too difficult with an externally plumbed electric water pump. Just put it evenly into the intake manifold and install the thermostat housing on the lower radiator hose.
I would think you would just need to run coolant mostly to the back of the intake manifold/heads and slightly less to the front. Then gut your stock water pump. I wonder what would happen if you just used a reverse rotation pump (v-belt if you've got serp) and then install the thermostat in the lower line. The biggest problem would be air pockets and tuning.

 

I guess I should look into how they do it on the 4th gens a little more, but I thought it seamd pretty easy to do on paper thus the reason I asked, well thanks for you info.