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i swapped a d16z6 into a friends 88 hatch. The only thing we cannot figure out is on the back of the z6 block there is two nipples comming off the water pipe, one goes from the left side or timing belt side of the block up to the intake. There is another one on the tranny side of the block we cannot figure out where it goes. We put the a6 intake mani onto it so the vacuums and everything would be ok. Im almost thinkin the si intake manifold does not have a second coolant line if its suppose to even go to the intake. I plugged the line and the car is overheating so im guessing it goes into the head somewhere?
Hopefully these pics help?:wacko:
 

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