Hello Folks,
Well I just mounted an aluminum water housing (from a second gen car) on my first gen. in order to save some weight, (I guess I saved about 8 pounds). I realize that there may be a write up on it, but I thought I would post what I have done.

This was pretty simple. I put the aluminum housing on with new gaskets. I used the water pump from the first gen car. The second gen uses one less stud that the first gen housing, this meant there was no place to locate the alternator support. So, I took out a tap and cut 10 mm by 1.25 threads into the open hole left in the water pump from the missing stud. I then screwed in a stud and attached the alternator here. This was simple and seems to work well.

 

i found out and did the same thing when i built my '74 13b and use the 2nd gen aluminum wp housing on it to keep the steel, aluminum, steel, aluminum, etc. u will also have to use the wp for that housing, that's what i had to do because of the different bolt pattern from 1st to 2nd gen. check and make sure that the bracket for the alt doesn't end up being too short and u run out of adjustment. i thought this would be the case so i also used the alt bracket from a 2nd gen.

 

So everything else bolts up the same? I snapped my coolant sensor off in the block and the S4 motors have the sensor in the pump housing, so I'm looking to do the same swap. How long did it take?

 

rxtasy3, I was able to mount the alt. bracket in the exact same spot. the stud is just in the water pump instead of through the water pump housing.
Crit, it only took a half an hour to do. And everything was the same except the one stud.

Good luck ~